ENVIRONMENTAL STABILITY OF INTERMETALLICS

金属间化合物的环境稳定性

基本信息

批准号：
04239107
负责人：
SHIBATA Toshio
金额：
$ 32.83万
依托单位：
OSAKA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04239107/
关键词：
intermetallics environmental stability high temperature oxidation hydrogen embrittlement alloying effect surface treatment TiAl Ni_3 (Si, Ti)Ni_3 (Al, Ti)Co_3Ti 添加元素イオン注入環境脆化 Ni_3Al Ni_3(Si,Ti)Co_3Ti 単結晶水素脆化

项目摘要

For practical applications of intermetallics, their stability in the environment has been concerned as well as their strength and ductility. High temperature oxidation and embrittlement induced by hydrogen and oxygen which come from the environment are the most important phenomena. In order to improve the high temperatrure oxidation resistance of TiAl which is expected to be utilized in quite near future, addition of minor alloying elements and surface treatment, or combination of both methods were studied. Addition of small amounts of Hf and Zr (0.2-0.5mass%) was found to increase the oxidation resistance up to 1300K.. Surface modification by a 30 mu m thickness coating of Co-30Cr-4Al with magnetron sputtering increased the oxidation resistance up to 1300k. Combination of alloying element addition (0.2mass%Hf) and surface treatment (Cr_2O_3/Cr pack) was found to improve drastically the oxidation resistance.Suppression of hydrogen embrittlement of intermetallics by addition of alloying … More elements and its mechanism have been studied. Addition of small amount of B and C to Ni_3 (Si, Ti) was found to inhibit the embrittlement in the atmosphere and distillled water and also to suppress partly the embrittlement in hydrogen gas. Aggregation of hydrogen atoms at grain boundaries and decrease in hydrogen diffusivity in lattice were suggested to suppress grain boundary fracture. Addition of small amount of Cr, Mn and Fe to Ni_3 (Si, Ti) was found to inhibit the embrittlement. The embrittlement of Co_3Ti was suppressed by addition of Fe and Al, the role of which was explained rationally by suppression of water dissociation to hydrogen atoms on the surface. The role of hydrogen from the environment and residual hydrogen in the bulk was studied by using Ni_3 (Al, Ti) and Ni_3 (Si, Ti) single or poly crystals. Extremely small amount ( ppm level) of residual hydrogen caused the embrittlement, and hydrogen from the environment affeted on ductility loss even at the high vacuum condition of 10^<-6> torr. Less

对于金属间的实际应用，它们在环境中的稳定性以及其强度和延展性一直很关注。来自环境的氢和氧气引起的高温氧化物和含量是最重要的现象。为了提高预计将在不久的将来使用TIAL的高温氧化物耐药性，添加次要合金元件和表面处理或两种方法的组合被研究了。发现少量的HF和ZR（0.2-0.5mass％）的添加可将氧化抗性提高到1300K。 Co-30Cr-4AL与磁控溅射的30 MU M厚度涂层的表面修饰增加了氧化抗性，最高为1300K。合金元素添加（0.2mass％HF）和表面处理（CR_2O_3/CR包）的组合被发现可极大地提高氧化耐药性。通过添加合金的氢化氢的抑制作用……已经研究了更多的元素及其机制。发现将少量的B和C添加到Ni_3（Si，Ti）中，可以抑制大气中的含量和蒸馏水，并部分抑制氢气中的含量。建议在晶界处氢原子的聚集，并建议晶格中的氢扩散率降低以抑制晶界断裂。发现将少量的Cr，Mn和Fe添加到Ni_3（Si，Ti）中可以抑制互惠。通过添加Fe和Al抑制了CO_3TI的含量，其作用是通过将水解离与表面上的氢原子的抑制来合理地解释的。使用Ni_3（Al，Ti）和Ni_3（Si，Ti）单个或多晶体研究了来自环境和残留氢的作用。残留氢的极少量（PPM水平）引起了脆化，即使在10^<-6> Torr的高真空状态下，也受到延展性损失的环境的氢。较少的

项目成果

期刊论文数量（166）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

谷口滋次,柴田俊夫,中村京太郎,柳襄杯,鄭志宏,黄巍,世昌: "IBED法によるSi_3N_4被膜の高温保護性" 材料と環境. 41. 101-106 (1992)

Shigeji Taniguchi、Toshio Shibata、Kyotaro Nakamura、Shobei Yanagi、Zhihong Cheng、Gan Huang 和 Chang Shi：“IBED 方法对 Si_3N_4 薄膜的高温保护”材料与环境。 41. 101-106 (1992)。