Combustion synthesis of transition metal nitrides under high nitrogen pressure.
Combustion synthesis of transition metal nitrides under high nitrogen pressure.
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高氮压下燃烧合成过渡金属氮化物。
DOI：
10.2472/jsms.36.12
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
M. Koizumi
中科院分区：
文献类型：
--
作者：
K. Hirao;Y. Miyamoto;M. Koizumi
研究了在0.1 ~ 25mpa氮气压力下，利用金属粉末压块的燃烧反应合成过渡金属氮化物（TiN、ZrN、HfN、NbN和TaN）。在低氮气压力（0.1MPa）下，由于氮气不完全供应到粉末压块中，并非所有情况下都能获得化学计量氮化物。在高氮压（= 10MPa）条件下，产物的氮化率取决于氮化物的绝热燃烧温度和熔点。Ti、Zr、Hf和Nb的绝热温度相对于相应氮化物的熔点较高，但由于金属颗粒在熔融过程中聚结，其渗氮率较低（<80%）。另一方面，当Ta和其他添加了氮化物的金属（0.5Ti+0.5TiN, 0.5Zr+0.5ZrN和0.7Nb+0.3NbN）的绝热温度接近相应氮化物的熔点时，生成了化学量氮化物。
Studies were made on the synthesis of transition metal nitrides (TiN, ZrN, HfN, NbN and TaN) by the combustion reaction of metal powder compacts under 0.1-25MPa nitrogen pressures. Under low nitrogen pressures (≅0.1MPa), stoichiometric nitrides were not obtained in all cases due to incomplete supply of nitrogen gas into the powder compacts. Under high nitrogen pressures (≅10MPa), it was found that the nitriding ratio of product depends on the adiabatic combustion temperature and melting point of nitrides. In the cases of Ti, Zr, Hf and Nb, which have quite high adiabatic temperatures compared with the melting points of the corresponding nitrides, the nitriding ratio was low (<80%) because of coalescing of metal particles by melting. On the other hand, in the cases of Ta and other metals with their nitride additions (0.5Ti+0.5TiN, 0.5Zr+0.5ZrN and 0.7Nb+0.3NbN), which have the adiabatic temperatures close to the melting points of the corresponding nitrides, the stoichiometric nitrides were produced.