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Relation Between Sintering Reactivity of Matrix and Thermal Shock Resistance of Ultra-low Cement Bonded Corundum-spinel Castables for Fired Purging Plugs 被引量:1
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作者 ZHANG Ju LONG Bin +7 位作者 ZHOU Yunpeng Andreas BUHR WANG Feng CUI Qingyang XIE Guofeng DING Dafei JIA Quanli YE Guotian 《China's Refractories》 CAS 2018年第4期13-20,共8页
Purging plugs installed in the bottom of steel ladles are widely used for the secondary refining of high quality steel grades.The dynamic service conditions and temperature gradients caused by the cold inert gas blown... Purging plugs installed in the bottom of steel ladles are widely used for the secondary refining of high quality steel grades.The dynamic service conditions and temperature gradients caused by the cold inert gas blown through the plug during stirring create a strong thermal shock impact on the materials.This can affect its service life and restrict the safety and efficiency of steel making if the plug fails during use.In this work,the influence of the particle size distribution (PSD) and amount of reactive alumina on the sintering behavior of ultra-low cement bonded corundum-spinel based castables was investigated on lab scale.The relationship between sintering reactivity of matrix and thermal shock resistance of castables was evaluated in detail.Results show that the sintering of castables can be intensified by using finer reactive alumina.However,excessive sintering of the castable through finer reactive alumina is negative for thermal shock resistance.The microstructure characterization reveals that castables with more intense sintering show denser matrix structure,which is less effective in hampering crack propagation and therefore results in decline of their thermal shock resistance. 展开更多
关键词 reactive alumina corundum-spinel castable sintering reactivity thermal shock resistance
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Thermal Shock Resistance of Bauxite-based β-Sialon Bonded Corundum Materials
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作者 LIUZhanjie ZHANGHaijun ZHONGXiangchong 《China's Refractories》 CAS 2005年第1期9-12,共4页
Thermal shock resistant properties of reaction sintered bauxite-based β-Sialon bonded corundum have been investigated, and the results are compared with those of Al_ 2O_ 3 based counterpart. It is found they all ha... Thermal shock resistant properties of reaction sintered bauxite-based β-Sialon bonded corundum have been investigated, and the results are compared with those of Al_ 2O_ 3 based counterpart. It is found they all have very good thermal shock resistance. Their residual strength ratios after one thermal shock cycle at ΔT=1200℃ and ΔT=1350℃ are 61%~73% and 53%~65% respectively. Their critical temperature difference (TSR) is 600℃~800℃. TSR parameters are calculated based on thermal expansion, modulus of elasticity, and fracture toughness determined. The reasons for improving TSR of these composite materials are discussed. 展开更多
关键词 thermal shock resistance Bauxite-based Sialon corundum
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Development of Thermal Shock Resistant and Low Creep Bricks for Hot Blast Stove
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作者 LIN Binyin LIU Jiehua +1 位作者 ZHOU Ningsheng ZHANG Jianwu 《China's Refractories》 CAS 2005年第4期8-12,共5页
The paper describes the ries with high thermal shock development of brick seresistance and low creep rate for hot blast stove, including research target and research plan on the basis of analysis on how to enhance the... The paper describes the ries with high thermal shock development of brick seresistance and low creep rate for hot blast stove, including research target and research plan on the basis of analysis on how to enhance the thermal shock resistance and to lower creep rate of the bricks. Efforts have been made on the selection of starting materials such as corundum, mullite, andalusite and sillimanite etc., together with some measures taken on multi-grade formulation, homogenizing of the matrix of bricks and addition of some special additives. The results indicated that the bricks were with characteristics such as higher thermal shock resistance of 〉 30 cycles under quenching in water from 1000℃, and creep rate of 0. 2 under 1400℃ for 20 -50hrs with load of 0.2 MPa. Now a series of products of this kind have been developed and produced. The application of the products in Wuhan Iron and Steel Co. showed very prospective results. Now most of domestic large sized blast furnaces say ≥- 1000m^3, including those of Baoshan Iron and Steel Co. , have selected the series products made by Gongyi No. 5 Refractories Head Factory(GYWN) for their hot blast stoves. 展开更多
关键词 refractory bricks Hot blast stove Low creep thermal shock resistance Andalusite Mullite corundum SILLIMANITE
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Effect of Zirconia Corundum Addition on Properties of Chrome Corundum Castables
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作者 GUO Peng CHEN Lu +2 位作者 YU Tongshu ZHANG Hui WANG Dongdong 《China's Refractories》 CAS 2023年第2期41-44,共4页
In order to investigate the effect of zirconia corundum on the preparation of chrome corundum castables,samples were prepared using tabular corundum,white fused corundum,active alumina micropowder,chromium oxide micro... In order to investigate the effect of zirconia corundum on the preparation of chrome corundum castables,samples were prepared using tabular corundum,white fused corundum,active alumina micropowder,chromium oxide micropowder and fused ziconia corundum particles as the main raw materials,and pure calcium aluminate cement as the binder.The effects of the fused zirconia corundum particles addition(1-0.5 mm,0,4.5%,9%,and 18%,by mass)on the linear change rate,the apparent porosity,the cold modulus of rupture,and the thermal shock resistance of chrome corundum castables were studied,and the microstructure of the samples was analyzed.The results show that:(1)with the zirconia corundum addition increasing,the permanent linear change on heating of the samples gradually increases,the apparent porosity gradually increases,the cold modulus of rupture gradually decreases,and the thermal shock resistance gradually increases;(2)according to SEM,it can be found that the phase transformation of ZrO2 after heat treatment leads to a large number of microcracks in the material.On one hand,the cold modulus of rupture of the material is reduced;on the other hand,the thermal shock resistance of the material is improved. 展开更多
关键词 fused zirconia corundum-chrome corundum CASTABLE thermal shock resistance MICROCRACK
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硫酸钙对刚玉-尖晶石材料性能的影响
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作者 孙小改 贾会霞 +2 位作者 李耀征 张毅清 贾全利 《河南科技》 2024年第10期74-78,共5页
【目的】优化刚玉-尖晶石材料的高温性能。【方法】以板状刚玉、电熔白刚玉、尖晶石、氧化铝微粉、硫酸钙为原料制备了刚玉-尖晶石制品,研究了硫酸钙加入量对刚玉-尖晶石材料的常温性能、高温抗折强度、弹性模量和抗热震性能的影响。【... 【目的】优化刚玉-尖晶石材料的高温性能。【方法】以板状刚玉、电熔白刚玉、尖晶石、氧化铝微粉、硫酸钙为原料制备了刚玉-尖晶石制品,研究了硫酸钙加入量对刚玉-尖晶石材料的常温性能、高温抗折强度、弹性模量和抗热震性能的影响。【结果】结果表明:随着硫酸钙加入量增加,试样常温抗折和耐压强度先升高后降低;高温抗折强度先升高后降低,抗热震性能在硫酸钙加入量少时较好。【结论】硫酸钙加入量为4.2%的试样,具有较好的常温性能、高温强度和抗热震性,其主要归因于经高温烧后硫酸钙分解生成的CaO与基质中的Al_(2)O_(3)反应生成的六方板状CA_(6),交错分布在基质中,这种结构有利于提高试样的抗热震性和弹性模量。 展开更多
关键词 刚玉-尖晶石 硫酸钙 热震 强度
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预合成CaZrO_(3)对镁锆质耐火材料性能的影响
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作者 梁效诚 冯雨 +3 位作者 刘中飞 罗旭东 黄敏 吴锋 《耐火材料》 CAS 北大核心 2024年第3期213-217,223,共6页
为提高镁锆材料的性能,首先以碳酸钙、脱硅锆和CeO_(2)为原料,制备不同CeO_(2)外加量(加入质量分数分别为0、1%和2%)的≤0.074 mm的预合成CaZrO_(3)粉,然后分别将其与3~1、1~0.074和≤0.074 mm的电熔镁砂混匀,在250 MPa压力下压制为圆... 为提高镁锆材料的性能,首先以碳酸钙、脱硅锆和CeO_(2)为原料,制备不同CeO_(2)外加量(加入质量分数分别为0、1%和2%)的≤0.074 mm的预合成CaZrO_(3)粉,然后分别将其与3~1、1~0.074和≤0.074 mm的电熔镁砂混匀,在250 MPa压力下压制为圆柱试样和长条试样,于1600℃保温3 h热处理制备了镁锆质耐火材料。研究了预合成CaZrO_(3)粉加入量(质量分数分别为10%、15%和20%)对材料性能的影响。结果表明:1)一定量的CeO_(2)与ZrO_(2)形成固溶体,使ZrO_(2)在室温下以t-ZrO_(2)形式存在,稳定了ZrO_(2)的晶型,促进了CaZrO_(3)的生成。2)CeO_(2)促进烧结,有利于致密化;CaZrO_(3)、ZrO_(2)与方镁石之间的热膨胀系数差产生的微裂纹增韧提高了抗热震性;材料与RH炉渣生成的复合尖晶石和CaZrO_(3),堵塞气孔,提高了抗渣性。3)当外加1%(w)CeO_(2)预合成CaZrO_(3),且预合成CaZrO_(3)加入量为20%(w)时,试样性能最佳。 展开更多
关键词 预合成CaZrO_(3) 镁锆质耐火材料 CeO_(2) 烧结性能 抗渣性 抗热震性
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高钒铁贫渣喷枪损毁原因分析与改进
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作者 秦云泉 康爱元 +2 位作者 李晋杰 高静 程立明 《山西冶金》 CAS 2024年第9期181-182,185,共3页
通过对承钢公司冶炼高钒铁贫渣过程中喷枪损毁原因进行分析,得出了影响喷枪使用寿命的主要因素有:枪体耐材的烧损、熔渣的侵蚀、温度剧变产生的循环应力破坏。工业性试验表明,采用电熔融镁砂作为骨料、氯化镁作为结合剂、添加钢纤维作... 通过对承钢公司冶炼高钒铁贫渣过程中喷枪损毁原因进行分析,得出了影响喷枪使用寿命的主要因素有:枪体耐材的烧损、熔渣的侵蚀、温度剧变产生的循环应力破坏。工业性试验表明,采用电熔融镁砂作为骨料、氯化镁作为结合剂、添加钢纤维作为耐材制成的喷枪,可以显著提升喷枪的耐火度和抗热震稳定性,进而提高喷枪的使用寿命,降低生产成本。 展开更多
关键词 喷枪 耐火材料 热震稳定性
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添加AMC复相材料的刚玉质浇注料的性能改善及应用效果
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作者 张涛 《耐火与石灰》 2024年第1期25-27,共3页
在刚玉质浇注料中添加AMC复相材料,利用AMC复相材料的CA6和MA抗渣性好、热震稳定性好的特点来改善刚玉质浇注料的使用性能,同时AMC复相材料作为资源再利用的新产品,在价格方面具有明显的优势,它能够降低耐材的生产成本。试验表明,在刚... 在刚玉质浇注料中添加AMC复相材料,利用AMC复相材料的CA6和MA抗渣性好、热震稳定性好的特点来改善刚玉质浇注料的使用性能,同时AMC复相材料作为资源再利用的新产品,在价格方面具有明显的优势,它能够降低耐材的生产成本。试验表明,在刚玉质浇注料中加入30%的AMC复相材料取得了较为理想的实验数据,其应用在钢包座砖上取得了良好的效果,既降低了生产成本,又有效地提高了钢包座砖的使用寿命。 展开更多
关键词 AMC复相材料 刚玉质浇注料 热震稳定性 抗渣性
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Effect of Calcium Chloride Addition on Properties of Corundum Spinel Castable 被引量:1
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作者 GUO Hongxiang SUN Xiaogai +2 位作者 JIA Quanli LI Xueyan LIU Xinhong 《China's Refractories》 CAS 2020年第4期46-49,共4页
Corundum spinel castable was prepared using tabular corundum as aggregates,white fused corundum powder,spinel powder and alumina powder as the matrix,pure calcium aluminate cement as a binder,and extra adding calcium ... Corundum spinel castable was prepared using tabular corundum as aggregates,white fused corundum powder,spinel powder and alumina powder as the matrix,pure calcium aluminate cement as a binder,and extra adding calcium chloride(0,1%,2%,and 3%,by mass).The effects of the CaCl2 addition on the cold physical properties,the hot strength,the thermal shock resistance and the microstructure of the castable were studied.The results show that,for the corundum spinel castable fired at 1550℃,with the increase of the CaCl2 addition from 0 to 3%,the cold strengthes first increase,then decrease,the apparent porosity increases,the volume density decreases,and the linear change rate first decreases and then increases,while the overall change is not significant;however,the hot modulus of rupture and the thermal shock resistance are obviously improved.This is mainly due to that,CaCl2 is evenly distributed in the castable in the form of solution,and reacts with Al2O3 to form small flake CA6 crystals,which evenly distributed in the sample matrix strengthening and toughening the material. 展开更多
关键词 corundum spinel castable calcium chloride calcium hexaluminate STRENGTH thermal shock resistance
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Research on application of kyanite in plastic refractory 被引量:1
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作者 ZHANG Wei MENG Qian DAI Wenyong 《Chinese Journal Of Geochemistry》 EI CAS CSCD 2013年第3期326-330,共5页
Effect of kyanite addition on properties of plastic refractories that based on Chinese calcined flint clay were investigated with the Chinese calcined flint clay as raw materials, aluminum sulfate and fireclay as bind... Effect of kyanite addition on properties of plastic refractories that based on Chinese calcined flint clay were investigated with the Chinese calcined flint clay as raw materials, aluminum sulfate and fireclay as binding systems. After 24 h curing after demoulding and another 24 h curing at 110 ℃, the specimens were heat-treated at 1000, 1300 and 1500℃ for 3 h, respectively. Thepermanent linear change, bulk density, modulus of rupture, clod crushing strength, thermal expansion coefficient and thermal shock resistance were examined. The results show that the shrinkage of plastic refractory decreased with increasing kyanite addition after heat-treated at 1000 and 1300℃ , and its expansivity increased with increasing kyanite addition after heat-treated at 1500 ℃. The strength can be increased when kyanite was added into the plastic refractory. The thermal expansion coefficient and the expansivity were increased, and the shrinkage can be reduced at high temperature when kyanite addition was more than 10%. On the condition of this experiment, the thermal shock resistance of plastic refractory was the best when kyanite addition is w(kyanite)=10%. 展开更多
关键词 耐火可塑料 蓝晶石 应用 加热处理 耐火材料 膨胀系数 耐热冲击性 粘土塑料
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Research on application of different particle sizes of cordierite on castable refractory 被引量:10
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作者 Zhang Wei Dai Wenyong Nobuaki Chiyoda 《Engineering Sciences》 2012年第1期72-75,共4页
Effect of different particle sizes of cordierite on properties of castable refractory by different heat treatment temperatures were investigated respectively with mullite and bauxite as raw materials, calcium aluminat... Effect of different particle sizes of cordierite on properties of castable refractory by different heat treatment temperatures were investigated respectively with mullite and bauxite as raw materials, calcium aluminate cement as binders. After 24 h curing in mould and another 24 h curing at 110 ℃ after demoulding, the specimens were heat treated at 1 000 ℃, 1 300℃ and 1 500℃ for 3 h, respectively. The bulk density ( BD), permanent linear change ( PLC), modulus of rupture(MOR) and clod crushing strength(CCS), thermal expansion coefficient and thermal shock resistance were examined. The results show that there is no obvious effect on adjusting permanent linear change and bulk density of castables by adding different particle sizes of cordierite at low temperature and intermediate temperature. Modulus of rupture of castable increase with the decreasing of the particle sizes of cordierite after heat treated by 1 000 ℃ and 1 300℃. In this experiment, thermal shock resistance of the castable with cordierite whose particle size is 0 - 1 mm is the best. 展开更多
关键词 CORDIERITE particle size castable refractory heat treatment temperatures thermal shock resistance
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Effect of Nano Calcium Carbonate on Properties of Corundum-spinel Castables 被引量:1
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作者 LI Zhigang YE Fangbao 《China's Refractories》 CAS 2013年第4期9-13,共5页
Using sintered corundum as aggregate, white fused corundum powder, fused spinel powder, ultra-fine a-A12 0 3, nano calcium carbonate and hydrated alumina as matrix, effects of nano calcium carbonate additions (0. 4%,... Using sintered corundum as aggregate, white fused corundum powder, fused spinel powder, ultra-fine a-A12 0 3, nano calcium carbonate and hydrated alumina as matrix, effects of nano calcium carbonate additions (0. 4%, O. 8%, 1.2%, 1.6% and 2. 0% in mass, the same hereinafter) on modulus of rupture, thermal shock resi.~tanee and slag resistance of corundum -spinel castables after treating at different temperatures were studied. The results show that nano calcium carbonate decomposes at high temperatures and in-situ forms ealci- ant aluminates, which can significantly increase the CMOR and HMOR of the castables after treating at 800 -1 400 ℃ ; adding nano calcium carbonate obviously improves the thermal shock resistance of the castables, and has little influence on the high basicity slag resist- ance, however, significantly decreases the corrosion and penetration resistance to low basicity slag. 展开更多
关键词 nano calcium carbonate corundum- spi-nel castables thermal shock resistance slag resistance
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Preparation of Al-AlN Bonded Corundum Based Refractories by in-situ Reaction
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作者 ZHU Boquan FANG Binxiang ZHANG Wenjie 《China's Refractories》 CAS 2008年第3期6-9,共4页
The Al-AlN bonded corundum based refractories was synthesized with the starting materials of fused alumina and metallic aluminium in nitrogen atmosphere through in-situ reaction. The study indicated that with the addi... The Al-AlN bonded corundum based refractories was synthesized with the starting materials of fused alumina and metallic aluminium in nitrogen atmosphere through in-situ reaction. The study indicated that with the addition of 14% metallic aluminium (13% of Al powder and 1% of Al fiber) , the material nitridized at 1100℃ for 3h has excellent physical properties. It is found that a massive quantity of alN in the forms of both whiskers and hexagon pellet particles is formed, and a large quantity of Al remained in the matrix. This multiple bonding system resulted in the excellent mechanical properties of the material. It is also found that the hydration tendency of the prepared material is inhibited, and the material exhibited excellent thermal shock resistance. The nature of protective oxidation of the bonding system is characterized. Thus, this material may become a new candidate of carbon-free sliding plate material for continuous casting. 展开更多
关键词 AIN corundum thermal shock resist-ance Hydration resistance
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二铝酸钙加入量对刚玉浇注料性能的影响 被引量:4
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作者 秦红彬 金锋 +6 位作者 唐世明 周慧君 李红霞 石书冰 张三华 程立 惠先磊 《耐火材料》 CAS 北大核心 2023年第3期189-193,共5页
为了改善刚玉浇注料的性能,以白刚玉、二铝酸钙(CA_(2))、活性α-Al_(2)O_(3)微粉和纯铝酸钙水泥为主要原料,制备了刚玉浇注料,研究了CA_(2)加入量(加入质量分数分别为0、20%、30%、40%)对刚玉浇注料性能的影响。结果表明:1)随着CA_(2)... 为了改善刚玉浇注料的性能,以白刚玉、二铝酸钙(CA_(2))、活性α-Al_(2)O_(3)微粉和纯铝酸钙水泥为主要原料,制备了刚玉浇注料,研究了CA_(2)加入量(加入质量分数分别为0、20%、30%、40%)对刚玉浇注料性能的影响。结果表明:1)随着CA_(2)的增多,刚玉浇注料的体积密度大幅减小,110℃烘干和800℃热处理后的常温耐压强度明显改善,而1200℃热处理后的常温耐压强度变化不明显;2)随着CA_(2)的增多,浇注料的平均热膨胀系数逐渐降低,热导率大幅降低,试样经800℃水冷热震后的抗折强度保持率大幅提升;3)CA_(2)的引入大幅提升了刚玉浇注料的透气性,且不影响刚玉浇注料的抗氢气还原性能。 展开更多
关键词 二铝酸钙 刚玉浇注料 抗热震性 热导率 热膨胀系数 抗氢气还原性能
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不同结合剂结合MgO-C耐火材料的性能研究 被引量:2
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作者 韩艺辉 曹喜营 +4 位作者 冯海霞 王晖 柳军 潘元帅 王建斌 《耐火材料》 CAS 北大核心 2023年第5期402-406,共5页
为减少碳排放,以电熔镁砂、鳞片石墨、Al-Si复合粉、α-Al_(2)O_(3)微粉为原料,分别选用新型环保的络合镁铝胶结剂(简写为W粉)和酚醛树脂(简写为PF)为结合剂,制备了MgO-C耐火材料,对比了其物理性能及抗热震性。结果表明:1)不同温度处理... 为减少碳排放,以电熔镁砂、鳞片石墨、Al-Si复合粉、α-Al_(2)O_(3)微粉为原料,分别选用新型环保的络合镁铝胶结剂(简写为W粉)和酚醛树脂(简写为PF)为结合剂,制备了MgO-C耐火材料,对比了其物理性能及抗热震性。结果表明:1)不同温度处理后,以W粉结合的试样W的线变化率、显气孔率均大于以PF结合的试样PF,体积密度、常温耐压强度略小于试样PF的;2)试样W比试样PF的抗热震性好,且试样W热震1次后的常温抗折强度比热震前的提高19.2%。 展开更多
关键词 MGO-C耐火材料 环保结合剂 物理性能 抗热震性
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用工业镁渣制备六铝酸钙/钙铝黄长石复相材料研究 被引量:1
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作者 白频波 邢莉 +1 位作者 孔祥辰 田玉明 《耐火材料》 CAS 北大核心 2023年第3期226-230,共5页
为实现工业废渣的有效利用,以工业镁渣、氧化铝为主要原料,加入4%(w)的PVA塑化剂,采用高温无压烧结法分别在1300、1400、1500、1600℃保温3 h后,得到六铝酸钙/钙铝黄长石(CA6/C2AS)复相耐火材料,研究热处理温度对其物相组成、物理性能... 为实现工业废渣的有效利用,以工业镁渣、氧化铝为主要原料,加入4%(w)的PVA塑化剂,采用高温无压烧结法分别在1300、1400、1500、1600℃保温3 h后,得到六铝酸钙/钙铝黄长石(CA6/C2AS)复相耐火材料,研究热处理温度对其物相组成、物理性能的影响。结果表明:经1500℃热处理3 h后的试样综合性能较优,其体积密度为1.59 g·cm^(-3),显气孔率为52.7%,抗折强度为30.8 MPa,荷重软化温度为1544℃,水化36 h后质量增加率不高于0.22%,800℃热震后抗折强度保持率为52.7%。试样具有较好的结构稳定性、抗水化性和抗热震性。 展开更多
关键词 CA6/C2AS 镁渣 抗水化性 抗热震性 荷重软化温度
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激光扫描法在全自动抗热震性试验机的应用
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作者 章健 章艺 +4 位作者 宋艳艳 董殿敏 王波 胡飘 刘克 《耐火材料》 CAS 北大核心 2023年第5期434-437,共4页
介绍了采用3D激光扫描技术研发的全自动抗热震性试验机的原理、结构和特点,该仪器的设计基于GB/T 30873—2014中水冷法抗热震性测试的相关要求,相较于传统测试方法,实现了抗热震试验过程中测试端面破损状态的测量计算、数据存档记录以... 介绍了采用3D激光扫描技术研发的全自动抗热震性试验机的原理、结构和特点,该仪器的设计基于GB/T 30873—2014中水冷法抗热震性测试的相关要求,相较于传统测试方法,实现了抗热震试验过程中测试端面破损状态的测量计算、数据存档记录以及停机判断等功能的全自动完成。应用结果表明,该仪器较大地提高了测试效率和测试精度,消除了人为误差,为抗热震性结果分析和过程分析提供了丰富的数据和图像资料。 展开更多
关键词 激光扫描法 抗热震性 自动检测 耐火材料
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氧化铝粉对微孔方镁石—镁铝尖晶石耐火骨料显微结构和性能的影响
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作者 鄢俊杰 鄢文 +2 位作者 陈茜琳 尹玉成 王晓 《盐湖研究》 CAS CSCD 2023年第2期36-44,共9页
以盐湖轻烧MgO粉和煅烧Al_(2)O_(3)粉为原料制备了4组微孔方镁石-镁铝尖晶石耐火骨料(镁铝尖晶石5 wt.%~20 wt.%),并采用XRD、SEM和压汞仪等研究了煅烧Al_(2)O_(3)粉添加量(3.7 wt.%,7.7 wt.%,12.1 wt.%和16.8 wt%)对其显微结构和性能... 以盐湖轻烧MgO粉和煅烧Al_(2)O_(3)粉为原料制备了4组微孔方镁石-镁铝尖晶石耐火骨料(镁铝尖晶石5 wt.%~20 wt.%),并采用XRD、SEM和压汞仪等研究了煅烧Al_(2)O_(3)粉添加量(3.7 wt.%,7.7 wt.%,12.1 wt.%和16.8 wt%)对其显微结构和性能的影响。煅烧Al_(2)O_(3)粉在骨料内部形成多孔状镁铝尖晶石颗粒,增加其添加量,可增大微孔骨料的显气孔率,降低体积密度。尽管多孔状镁铝尖晶石微颗粒与MgO微颗粒间存在微裂纹,降低了耐火骨料的抗折强度,但该多孔镁铝尖晶石微颗粒能够诱导微孔骨料中微裂纹产生偏转和裂纹分支,在经受热震冲击时,能改善微孔骨料的热震稳定性。当煅烧Al_(2)O_(3)粉的添加量为7.7wt.%时,微孔方镁石-镁铝尖晶石耐火骨料拥有最佳的综合性能,其体积密度为3.23 g/cm^(3),中位孔径为386.1 nm,抗折强度为45.2 MPa,800℃导热系数为10.5 W/(m·K),热震后抗折强度保持率最高(97.0%)。 展开更多
关键词 微孔方镁石-镁铝尖晶石耐火骨料 盐湖镁资源 显微结构 导热系数 热震稳定性
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Influence of h-BN particle size on fracture behavior and thermal shock resistance of Al2O3-C refractories
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作者 Zi-xu Ji Wen-jing Liu +2 位作者 Ning Liao Ya-wei Li Tian-bin Zhu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2022年第7期1129-1137,共9页
h-BN can be applied in Al_(2)O_(3)–C refractories to substitute graphite due to their similar crystal structure and better resistance to molten steel and oxidation.The effects of h-BN particle size on the mechanical ... h-BN can be applied in Al_(2)O_(3)–C refractories to substitute graphite due to their similar crystal structure and better resistance to molten steel and oxidation.The effects of h-BN particle size on the mechanical properties and fracture behavior of Al_(2)O_(3)–C refractories were investigated through wedge splitting test and microstructural analyses.The obtained results demonstrated that the addition of larger-sized h-BN was conducive to the growth of in situ formed SiC whiskers,which contributed to the highest flexural strength(42.63±3.10 MPa)of specimen D10.In comparison,the smaller-sized h-BN can induce more crack propagation paths along the interface and within matrix,leading to more tortuous crack propagation paths,and thus the thermal shock-related parameters such as specific fracture energy,characteristic length,and thermal shock resistance were improved.Consequently,the residual strength ratio of Al_(2)O_(3)–C refractories was increased from 35.5%to 42.5%with decreasing the h-BN particle size from 10 to 0.1μm. 展开更多
关键词 Al_(2)O_(3)–C refractory H-BN Fracture behavior thermal shock resistance
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Preparation of MgO whisker from magnesite tailings and its application 被引量:8
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作者 王楠 陈敏 +1 位作者 李月圆 倪红卫 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第9期2061-2065,共5页
Magnesium carbonate whisker as precursor was prepared from the low-grade magnesite tailings by the route of calcination, hydration, carbonation and thermal decomposition, and then MgO whisker was prepared by calcining... Magnesium carbonate whisker as precursor was prepared from the low-grade magnesite tailings by the route of calcination, hydration, carbonation and thermal decomposition, and then MgO whisker was prepared by calcining the precursor. In addition, the effect of MgO whisker addition on sintering and thermal shock resistance of refractory was also investigated. The results show that the thermal decomposition product is MgCO3·3H2O and its morphology is remarkably influenced by the types of additives, and magnesium carbonate whisker with the length of 10-60 μm and length-diameter ratio of 10-20 is successfully prepared when a type of soluble magnesium salt is added. MgO whisker with the length of 10-40 μm is derived from precursor with the heating rate of 1 ℃/min. The thermal shock resistance of refractory is significantly improved by the addition of MgO whisker due to its effect on binding and preventing crack expanding, and the proper amount of whisker addition is around 3%. 展开更多
关键词 MgO whisker PRECURSOR magnesium carbonate whisker refractory thermal shock resistance
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