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Ta合金高温防护涂层研究 被引量:9
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作者 王禹 胡行方 《材料工程》 EI CAS CSCD 北大核心 2001年第10期3-4,38,共3页
使用料浆熔烧工艺在 Ta- 10 W合金表面制备了 Si- Cr- Ti- W系统的硅化物涂层。分析认为 ,涂层由二硅化物和硅基共熔体组成。在结构上由外表面保护膜、主体层以及界面内层三部分构成。保护膜在高温下阻止氧向基体的浸渗 ,减少与硅的化... 使用料浆熔烧工艺在 Ta- 10 W合金表面制备了 Si- Cr- Ti- W系统的硅化物涂层。分析认为 ,涂层由二硅化物和硅基共熔体组成。在结构上由外表面保护膜、主体层以及界面内层三部分构成。保护膜在高温下阻止氧向基体的浸渗 ,减少与硅的化学反应 ,使主体层保持较高的硅含量。内层有助于释放涂层积聚的内应力 ,保持良好的界面结合。高温性能测试结果表明 ,在 180 0℃高温下抗氧化寿命超过 2 .5 h,使该温度到室温的热循环达 展开更多
关键词 ta基金合 硅化物涂层 高温抗氧化性 抗热震性 表面改性
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Phase equilibria in Co-rich region of Co-Ti-Ta system 被引量:1
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作者 蒋敏 萨仁格日乐 +2 位作者 杨舒宇 李洪晓 郝士明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第11期2391-2395,共5页
The phase equilibria in Co-rich region of Co-Ti-Ta system were studied.The microstructure and XRD analysis together with EDS determination show that L12 type Co3Ti phase and Laves_C36_Co3Ta phase get equilibrium with ... The phase equilibria in Co-rich region of Co-Ti-Ta system were studied.The microstructure and XRD analysis together with EDS determination show that L12 type Co3Ti phase and Laves_C36_Co3Ta phase get equilibrium with α-Co phase from 1 000 to 1 200 ℃.The Co3Ti phase possesses a solubility of Ta higher than 10%,and the addition of Ta stabilizes the Co3Ti phase.The isothermal sections of the Co-Ti-Ta system in the Co-rich region at 1 000,1 100 and 1 200 ℃ were constructed according to the result. 展开更多
关键词 L12 type intermetallic compound phase equilibrium Co-Ti-ta Co-based superalloys
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Effect of Ta addition on solidification microstructure and element segregation of IN617B nickel-base superalloy 被引量:5
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作者 Shuang GAO Zhen-feng SONG +2 位作者 Bo HE Lan-zhang ZHOU Jie-shan HOU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第2期559-568,共10页
IN617B nickel-base superalloy is considered as a good candidate material in 700℃advanced ultrasupercritical coal-fired power plants.The effect of Ta addition on solidification microstructure and element segregation o... IN617B nickel-base superalloy is considered as a good candidate material in 700℃advanced ultrasupercritical coal-fired power plants.The effect of Ta addition on solidification microstructure and element segregation of IN617B alloy was investigated by OM,SEM,TEM,EDS,EPMA and thermodynamic calculation.The results showed that the solidification microstructure exhibited a dendritic segregation pattern with many primary carbides distributed in interdendritic regions,such as network M_(6)C,lath M_(23)C_(6) and granular Ti(C,N).The addition of Ta promoted the precipitation of Ta-rich MC significantly inhibiting the precipitation of M_(6)C and M_(23)C_(6),and reduced the segregation degree of Al,Mo and Ti alloying elements.The addition of Ta decreased the melting temperature of MC carbide,but did not impact the solidification path,that was,L→γmatrix→MC or Ti(C,N)→M_(6)C→M_(23)C_(6),where MC and Ti(C,N)tended to form symbiotic microstructure with M_(6)C.This study will provide theoretical basis and data support for the alloy optimization and casting structure control of IN617B nickel-based superalloy. 展开更多
关键词 IN617B nickel-base superalloy ta addition solidification microstructure element segregation CARBIDE
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Derivation and application of concentration formula of alloy genes of DO_3-type in BCC alloy systems 被引量:1
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作者 PENG Hong-jian LI Ling +1 位作者 LI Xiao-bo XIE You-qing 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第7期1573-1581,共9页
Taking Ta–W alloy system as an example, the concentration formulae of alloy genes of DO3-type alloys in BCC structures were derived on the basis of the theory of alloy genes and the number of coordination atoms. The ... Taking Ta–W alloy system as an example, the concentration formulae of alloy genes of DO3-type alloys in BCC structures were derived on the basis of the theory of alloy genes and the number of coordination atoms. The concentrations of alloy genes of DO3-TaW3 and DO3-Ta3W ordered alloys were calculated as functions of composition xW and ordering degree (s). When s=smax, the concentrations of alloy genes of stoichiometric DO3-TaW3 compound are equal to those of alloys, that is, x8^Ta=0.25(at),x4^W=0.5(at),x8^W=0.25(at)The concentrations of alloy genes of stoichiometric DO3-Ta3W compound are also equal to those of alloys, that is,x0^Ta=0.25(at),x4^Ta=0.5(at),x0^W=0.25(at). As ordering degree decreases, alloy genes of DO3-TaW3 and DO3-Ta3W ordered alloys will split. And the degree of splitting of alloy genes increases with the ordering degree decreasing. The atomic states and properties of DO3-TaW3 and DO3-Ta3W ordered alloys were calculated as a function of composition xW. The reason was pointed out that preparation of DO3-TaW3 and DO3-Ta3W intermetallic compounds is difficult due to small differences in their cohesive energies. It will provide theoretical guidance for the scientific designation to new candidate for ultra- high-temperature materials in areo-engine applications. 展开更多
关键词 ta–W alloy system BCC structure alloy gene
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