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STUDY ON PREPARATION OF CERAMIC MATRIX COMPOSITE OF WC-Co ULTRAFINE POWDERS 被引量:1
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作者 曹立宏 时东霞 +1 位作者 欧阳世翕 关波 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1995年第2期40-46,共7页
The W -Co compound precursor powders with an average particle sife of 60 nm were prepared by the chemical coprecipitation as the raw materials of Na2WO1 and CoCl2 and as the reagents of HCI and NH3 ?H2O. After re-duci... The W -Co compound precursor powders with an average particle sife of 60 nm were prepared by the chemical coprecipitation as the raw materials of Na2WO1 and CoCl2 and as the reagents of HCI and NH3 ?H2O. After re-ducing and carburizing the precursor powders by hydrogen gas and CO-CO 2 mixture gas. the WC-Co composite povvders ivith an average particle size of 0. 18/wi can be obtained. The purity and particle size of powders -were analysed by XRD and TEM. respectively. Meanwhile, the key factors to influ-ence the reducing and carburizing process of powders were also studied. 展开更多
关键词 wc-co ceramic matrix composite ul-trafine powders
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Study on the diamond/ultrafine WC-Co cermets interface formed in a SPS consolidated composite 被引量:1
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作者 SHI Xiaoliang SHAO Gangqin DUAN Xinglong YUAN Runzhang 《Rare Metals》 SCIE EI CAS CSCD 2006年第2期150-155,共6页
Nanocrystalline WC-Co composite powder and coated tungsten diamond by using vacuum vapor deposition were consolidated by the spark plasma sintering (SPS) process to prepare diamond-enhanced WC-Co cemented carbide co... Nanocrystalline WC-Co composite powder and coated tungsten diamond by using vacuum vapor deposition were consolidated by the spark plasma sintering (SPS) process to prepare diamond-enhanced WC-Co cemented carbide composite materials. The interface microstructures between coated tungsten diamond and WC-Co cemented carbide matrix were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDXS). The results showed that there is a transitional layer between the diamond and the matrix, in which the carbon content is 62.97wt.%, and the content of cobalt in the transitional zone is 6.19wt.%; the content of cobalt in the WC-Co cemented carbide matrix is 6.07wt.%, in which the carbon content is 15.95wt.%, and the content of cobalt on the surface of diamond is 7.30wt.%, in which the carbon content is 80.38wt.%. The transitional zone prevents the carbon atom of the diamond from spreading to the matrix, in which the carbon content does coincide with the theoretical value of the raw nanocomposite powders, and the carbon content forms a graded distribution among the matrix, transitional zone, and the surface of diamond; after the 1280℃ SPS consolidated process the diamond still maintains a very good crystal shape, the coated tungsten on the surface of the diamond improves thermal stability of the diamond and increases the bonding strength of the interface between the diamond and the matrix. 展开更多
关键词 DIAMOND nanocrystalline wc-co composite powders INTERFACE spark plasma sintering
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化学沉淀法制备超细WC-Co复合粉的研究 被引量:2
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作者 王玉香 文小强 周健 《中国钨业》 CAS 2012年第6期24-27,共4页
以钨酸铵和硝酸钴为原料,经化学沉淀后煅烧,然后在真空气氛下直接还原碳化制得超细WC-Co复合粉。考察了化学沉淀过程中料液浓度、反应温度和反应后母液的pH值等因素对所得前驱体氧化物粒度及收率的影响。用XRD和扫描电镜对所得超细WC-C... 以钨酸铵和硝酸钴为原料,经化学沉淀后煅烧,然后在真空气氛下直接还原碳化制得超细WC-Co复合粉。考察了化学沉淀过程中料液浓度、反应温度和反应后母液的pH值等因素对所得前驱体氧化物粒度及收率的影响。用XRD和扫描电镜对所得超细WC-Co复合粉进行了分析和观察。结果表明,采用这种方法可以制取形貌规则,分散性良好的超细WC-Co复合粉,并且此法原料成本低,工艺简单,过程易控。 展开更多
关键词 化学沉淀法 超细WC—Co复合粉 直接还原碳化 粒度
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碳源对超细WC-Co复合粉末性能的影响 被引量:2
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作者 吕健 王忠华 +3 位作者 尚根峰 羊建高 方春生 王韶毅 《中国钨业》 CAS 北大核心 2016年第6期41-45,共5页
分别以有机碳、超纯炭黑为碳源,可溶性钨盐、钴盐为原材料,采用喷雾干燥、低温还原碳化法制备超细WC-Co复合粉末。对两种不同碳源制得的WC-Co复合粉末进行碳含量、氧含量、松装密度、BET比表面积、激光粒度分布测定、形貌观察和物相分... 分别以有机碳、超纯炭黑为碳源,可溶性钨盐、钴盐为原材料,采用喷雾干燥、低温还原碳化法制备超细WC-Co复合粉末。对两种不同碳源制得的WC-Co复合粉末进行碳含量、氧含量、松装密度、BET比表面积、激光粒度分布测定、形貌观察和物相分析。研究碳源对超细WC-Co复合粉末性能的影响。结果表明:两种碳源制备的复合粉末都呈空壳球形结构,比表面积均大于2 m^2/g,一次颗粒尺寸在100~200 nm之间,空壳球体平均粒径在30~50μm之间。有机碳制备的复合粉末的一次颗粒间孔隙度更高,空壳球体壁厚更薄,粉末松装密度更低,所需的还原碳化温度更低、时间更短。 展开更多
关键词 超细wc-co复合粉末 有机碳 炭黑 喷雾干燥 低温还原碳化
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Abrasion Resistance Enhancement of Ultrafine-structured WC-Co Coating Fabricated by using in situ Synthesized Composite Powder 被引量:7
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作者 Haibin Wang Xiaoyan Song +2 位作者 Chongbin Wei Yang Gao Guangsheng Guo 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2013年第11期1067-1073,共7页
The ultrafine WC-Co composite powder was synthesized by a newly developed rapid route based on in situ reactions. By using the as-synthesized composite powder, the granulation processing was then carried out to prepar... The ultrafine WC-Co composite powder was synthesized by a newly developed rapid route based on in situ reactions. By using the as-synthesized composite powder, the granulation processing was then carried out to prepare the ultrafine-structured thermal spraying feedstock. The influences of the heat-treatment process on density of the feedstock powder, phase constitution and wear resistance of the resultant WC-Co coatings fabricated by high velocity oxy-fuel (HVOF) were investigated. The results showed that increasing the heating temperature and extending the holding time leaded to remarkable increase in the density and flowability of the feedstock powder. As a result, the decarburization of the in-flight particles could be decreased and the wear resistance of coating was significantly enhanced. The present study demonstrated that the developed techniques for the ultrafine powder and its thermal-sprayed coatings had very promising applications in scaling up to produce ultrafine-structured cermet coatings with excellent performance. 展开更多
关键词 wc-co composite powder DECARBURIZATION Density Ultrafine-structured coating Abrasion resistance
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PREPARATION OF WC-Co POWDER BY DIRECT REDUCTION AND CARBONIZATION 被引量:5
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作者 Zhonglai Yi Gangqin Shao Xinglong Duan Peng Sun Xiaoliang Shi Zhen Xiong Jingkun Guo 《China Particuology》 SCIE EI CAS CSCD 2005年第5期286-288,共3页
A new approach to produce superfine WC-Co powder by direct reduction and carbonization is proposed. Water-soluble salts containing W and Co were used as raw materials. Tungsten and cobalt oxide powder (CoWO4/WO3) wa... A new approach to produce superfine WC-Co powder by direct reduction and carbonization is proposed. Water-soluble salts containing W and Co were used as raw materials. Tungsten and cobalt oxide powder (CoWO4/WO3) was first formed by a spray-pyrolysis technique, which was then mixed with carbon black and converted to WC-Co composite powder at 950℃ for 4 h in N2 atmosphere. The resulting powder has a particle size of 100-300 nm. 展开更多
关键词 tungsten carbide-cobalt wc-co direct reduction and carbonization composite powder
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超细锆基复合氧化物粉体制备方法概述 被引量:8
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作者 敖红敏 俞耀伦 +2 位作者 龙志奇 黄小卫 刘营 《稀有金属》 EI CAS CSCD 北大核心 2013年第2期302-311,共10页
超细氧化锆及氧化锆基复合氧化物粉体材料具有特殊的结构和功能,在陶瓷增韧、催化作用、传感器以及功能薄膜等领域具有广泛的应有前景。对近年来国内外超细氧化锆粉体及氧化锆基复合氧化物粉体的制备方法进行了总结,包括沉淀法、水热法... 超细氧化锆及氧化锆基复合氧化物粉体材料具有特殊的结构和功能,在陶瓷增韧、催化作用、传感器以及功能薄膜等领域具有广泛的应有前景。对近年来国内外超细氧化锆粉体及氧化锆基复合氧化物粉体的制备方法进行了总结,包括沉淀法、水热法、溶胶-凝胶法、微乳状液法、电化学合成法、气相法、固相法等,并简述相关方法制备原理,分析比较各制备方法的优缺点,为广大科研工作者提供参考。 展开更多
关键词 超细粉体 氧化锆 锆基复合氧化物 制备
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山沉香超微粉与普通粉HPLC指纹图谱的比较研究 被引量:4
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作者 田景民 鞠爱华 +1 位作者 庄志鹤 蔡丽娟 《华西药学杂志》 CAS CSCD 2017年第6期625-628,共4页
目的建立山沉香药材的HPLC指纹图谱,比较山沉香普通粉与超微粉指纹图谱的差异。方法采用Di KMA-C_(18)色谱柱(250 mm×4.6 mm,5μm),流动相为甲醇-0.4%磷酸水溶液,梯度洗脱,流速1.0 m L·min^(-1),检测波长281 nm,柱温25℃,进样... 目的建立山沉香药材的HPLC指纹图谱,比较山沉香普通粉与超微粉指纹图谱的差异。方法采用Di KMA-C_(18)色谱柱(250 mm×4.6 mm,5μm),流动相为甲醇-0.4%磷酸水溶液,梯度洗脱,流速1.0 m L·min^(-1),检测波长281 nm,柱温25℃,进样量20μL。结果确立了29个山沉香药材指纹图谱的共有峰,10批山沉香药材的相似度评价结果均>0.9;山沉香经超微粉碎后,化学成分的种类及数目并未发生明显改变,但其主要化学成分的含量明显提高。结论所用方法准确可靠、重复性好,可作为山沉香药材质量控制的有效方法;超微粉碎能明显促进山沉香化学成分的溶出。 展开更多
关键词 山沉香 指纹图谱 高效液相色谱 共有指纹峰 化学成分 超微粉 蒙药
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聚丙烯/超细羽绒粉体复合纤维的制备与性能研究
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作者 万福成 郭振滨 黄娟 《上海纺织科技》 北大核心 2018年第5期24-27,共4页
研究了不同配比的聚丙烯/聚氨酯复合纤维的可纺性以及聚丙烯/聚氨酯/超细羽绒粉体复合纤维的可纺性、染色性和回潮性能。结果表明,当聚氨酯含量≥35%时,聚丙烯/聚氨酯复合纤维的可纺性会急剧下降,且随着聚氨酯含量的增加.复合... 研究了不同配比的聚丙烯/聚氨酯复合纤维的可纺性以及聚丙烯/聚氨酯/超细羽绒粉体复合纤维的可纺性、染色性和回潮性能。结果表明,当聚氨酯含量≥35%时,聚丙烯/聚氨酯复合纤维的可纺性会急剧下降,且随着聚氨酯含量的增加.复合纤维的失重率逐渐增大,颜色从透明逐渐向白色转变。当超细羽绒粉体含量增加至22.5%时,聚丙烯/聚氨酯/超细羽绒粉体复合纤维的纺丝成形性急剧下降,同时出现了断丝现象;未添加超细羽绒粉体的复合纤维仍然保持透明且基本不回潮.而加入7.5%~22%超细羽绒粉体后的复合纤维都达到了染色效果,且随着超细羽绒粉体含量的增加.聚丙烯/聚氨酯/超细羽绒粉体复合纤维的色深值和回潮率逐渐增加。 展开更多
关键词 超细羽绒粉体 复合纤维 制备 染色性能 失重率 回潮率
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