Titanium carbide based composites for high temperature applications
Titanium carbide based composites for high temperature applications
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DOI：
10.1016/s0955-2219(99)00101-6
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发表时间：
1999-01-01
影响因子：
5.7
通讯作者：
Durlu, N
中科院分区：
文献类型：
--
作者：
Durlu, N
具有镍合金和铁合金的碳化钛基复合材料目前用于高性能应用中，其中磨损和腐蚀是材料失效的主要来源。然而，对于高温关键应用，金属粘结剂镍和铁限制了TiC基复合材料的使用。因此，需要开发具有良好高温性能的新型粘结剂体系，以扩大TiC基复合材料的使用范围。硅化物和铝化物具有良好的高温腐蚀性能和力学性能，是潜在的粘结剂体系。在这项研究中，两个粘结剂系统，Fe-25原子%的Si和Fe-40原子%的Al已被选择，并进行了反应烧结的元素锂和Si，或Fe和Al粉末，与65重量%的TiC和80重量%的TiC粉末在温度在约1410-1430摄氏度在真空下。X射线衍射分析表明，TiC-硅化铁复合材料中存在TiC和Fe 3Si相，而TiC-铝化铁复合材料中存在TiC、Fe 3Al 2和Fe 3AlC 0. 5相。样品的差热分析表明，铁硅化物和铁铝化物粘结剂的液相线温度分别为1265和1425 ℃左右。结果表明，反应烧结TiC-硅化铁和TiC-铝化铁复合材料的显微硬度为1100-1470 kg·mm ~（-2），三点弯曲强度为600-775 MPa。(C)1999爱思唯尔科技有限公司。保留所有权利。
Titanium carbide based composites with nickel alloys and iron alloys ave currently used in high performance applications where wear and corrosion are the main sources of material failure. For high temperature critical applications, however, the metallic binders nickel and iron limit the use of TiC-based composites. Hence, new binder systems which have good high temperature properties need to be developed in order to extend the use of TiC-based composites. Silicides and aluminides are potential binder systems with their good high temperature corrosion and mechanical properties. In this study, two binder systems, Fe-25 at% Si and Fe-40 at% Al have been selected, and were processed with reaction sintering of elemental lie and Si, or Fe and Al powders, with 65 wt% TiC and 80 wt% TiC powders at temperatures at around 1410-1430 degrees C under vacuum. X-ray diffraction analysis show TiC and Fe3Si phases in the TiC-iron silicide composites, whereas TiC, Fe3Al2 and Fe3AlC0.5 phases were observed in TiC-iron aluminide composites. Differential thermal analysis of the samples shows that liquidus temperatures of the iron-silicide and iron-aluminide binders weve around 1265 and 1425 degrees C, respectively. Vickers microhardness values of 1100-1470 kg mm(-2) and 3-point bending strengths of 600-775 MPa were obtained in these high density reaction sintered TiC-iron silicide and TiC-iron aluminide composites. (C) 1999 Elsevier Science Ltd. All rights reserved.