Importance

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Abstract

This invention relates to the manufacture of a mechanical seal ring provided with a cemented carbide hardened layer or ring which is firmly bound to a substrate of a mechanical seal ring and is of sufficient hardness. The method is substantially characterized by the use of Ni--P alloy as a binder between the cemented carbide layer and the substrate. In the manufacturing process, after a presintered carbide compact made of hard carbide powder such as tungsten carbide powder is applied to a groove of the substrate, the Ni--P alloy in either paste form or compacted and sintered compact form is applied onto the presintered carbide compact and finally is sintered in a non-oxidizing furnace. In the above sintering process, Ni and P infiltrates and diffuses into the substrate and the presintered carbide compact whereby the cemented carbide hardened layer and the substrate can be firmly bound to each other due to the metallurgical bonding therebetween.

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First Claim