METHOD OF MAKING A TRIPLE DENSITY SILICON NITRIDE ARTICLE

摘要

A method of making a triple density article of silicon nitride is disclosed. A first element is formed by hot pressing silicon nitride particles. The general shape of a second element is formed by injection molding silicon metal particles and a binder and subsequently burning out the binder. The general shape of a third element is slip cast adjacent and in bonding relationship to at least a portion of the second element. The so combined second and third elements are nitrided in a nitriding operation. Facing surface areas of the first element and the third element are bonded together by applying heat to both elements and pressure to at least one of the elements while the other element is held in a fixed position.