| 摘要 |
A cermet in which the metal content varies gardually from a zero content in the core to a maximum at the surface is produced by hot pressing together layers of the powder mixture containing the required proportions of metal and ceramic. The ceramic may be silicon nitride and the metal may be tantalum, tungsten, niobium, molybdenum, or rhenium, or their alloys, hot pressing being effected at 1600-1900 DEG C. The high metal content at the surface of the cermet helps in the joining of the cermet to metals by brazing.
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