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Fabrication of new type cermets of functionally graded materials with surface of high thermal resistance above 3000℃

3000℃以上表面高耐热功能梯度材料新型金属陶瓷的制备

基本信息

批准号：
09650761
负责人：
NUNOGAKI Masanobu
金额：
$ 1.47万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

Some cermets; TaC, TaC, ZrC, ZrN, TiC, TiN and TiィイD22ィエD2AIN have been fabricated successfully from metals; Ta, Zr, Ti and TiAl, respectively, by means of the reactive plasma processing developed originally. Each cermet was formed at a sub-surface of base metal as a thick layer of carbide or nitride. The decomposition temperature of TaC, ZrC and TiC, produced by sintering were reported to reach 4000, 3550 and 3300℃, respectively. The plasma processing was done at high temperature over 1000℃. Thicknesses of cermets were increased with the processing-temperature and the processing-time. As the results of the preliminary experiment, the maximum Vicker's hardness and thickness of cermets; TaC, ZrC and TiィイD22ィエD2AIN were 3000Hv/100μm for 5h, 1300Hv/100μm for 5h and 3500Hv/24μm for 3h [Hv;kg・mmィイD12ィエD1], respectively.The characteristic features of processed cermets were on the points, 1) Cermets were produced at the sub-surface of base metals by means of transformation of base metals-themselves with an aid of carbon or nitrogen diffused from the surface facing the processing plasma, 2) The concentration profile of carbon- or nitrogen-compounds degraded gradually in the modified layer and the interface with the distance from the surface. The cermet layers must have the properties of functionally graded materials on hardness, thermal conductivity and the abrasion resistance of modified layer.Additionally, the new processing with 20MeV-electron beam was performed before the plasma processing for increasing the thickness of modified layer at the lower processing temperature. The thickness of TaC-cermet layer carbonized at 1300℃ after the irradition to a fluence of 3×10ィイD115ィエD1 e・cmィイD1-2ィエD1 increased by about four times that of non-irradiation at 1000℃.

一些金属陶瓷利用反应等离子体技术，分别从Ta、Zr、Ti和TiAl等金属材料中成功地制备了TaC、TaC、ZrC、ZrN、TiC、TiN和Ti掺杂D22掺杂D2 AlN。每个金属陶瓷在基底金属的次表面处形成为碳化物或氮化物的厚层。烧结生成的TaC、ZrC和TiC的分解温度分别达到4000、3550和3300℃。等离子体处理在超过1000℃的高温下进行。金属陶瓷的厚度随着加工温度和加工时间的增加而增加。初步实验结果表明，TaC、ZrC和Ti_（22）Al_（22）AlN金属陶瓷的最大维氏硬度和厚度分别为3000 Hv/100μm、1300 Hv/100μm和3500 Hv/24μm [Hv; kg·mm × D12 × D1]，加工后金属陶瓷的特征表现在：1）借助于从面向加工等离子体的表面扩散的碳或氮，通过基体金属本身的转变，在基体金属的次表面处产生金属陶瓷，（2）碳氮化合物在改性层和界面中的浓度分布随距离表面的增加而逐渐降低。金属陶瓷层必须具有功能梯度材料的硬度、热导率和改性层的耐磨性等性能，另外，为了在较低的处理温度下增加改性层的厚度，在等离子体处理前进行了20 MeV电子束处理。在1300℃下，经3×10 ~（-1）Pa·cm ~（-1）D_（115）Pa·cm ~（-1）D_（1 -2）Pa·cm ~（-1）D_（1）辐照后，TaC-金属陶瓷层的厚度比1000℃下未辐照时增加了约4倍。