Diffusion Interaction in Fiber-Reinforced Composites of the Chromium Alloy – Silicon Carbide System |
| |
Authors: | Pisarenko Vladimir A |
| |
Affiliation: | (1) National Academy of Sciences of Ukraine, Institute for Problems of Materials Science, ul. Krzhizhanovskogo 3, Kiev 142, Ukraine, 03142 |
| |
Abstract: | Diffusion interaction in the Cr – ZrC and Cr – HfC systems has been studied in the temperature range 1200-1400°C. The impurities contained in chromium or carbides were found to affect the interaction in the systems. Almost no interaction was observed when the systems were held at temperatures up to 1300°C for 100 h. At higher temperatures the carbides were reduced to ZrO2, HfO2, and Cr23C6 because of the presence of a slight amount of oxygen. Thermodynamic calculations indicated no interaction in these systems at temperatures up to 1600°C. A study of the interaction in the systems SiC – ZrC and SiC – HfC showed that a transition zone formed already in the stage of sample preparation by diffusion welding in vacuum (1300°C, vacuum of 10_3 Pa, with a load applied for 20 min). During annealing (1300°C, 50 h) the transition zone stratified, forming a solid solution of silicon in Zr(Hf)C and SiC inclusions in the SiC – Zr(Hf)C solid solution. A transition zone formed on the zirconium carbide side when SiC interacted with Zr(Hf)C. The interaction in SiC – Zr(Hf)C casts doubt on the use of them as a barrier without antidiffusion layers. |
| |
Keywords: | chromium alloy composite diffusion silicon carbide zirconium carbide hafnium carbide temperature impurities oxygen reduction of oxides transition layer (zone) diffusion welding annealing solid solution anti-diffusion barriers (layers) |
本文献已被 SpringerLink 等数据库收录! |
|