| 摘要 |
FIELD: process engineering.SUBSTANCE: invention relates to powder metallurgy, particularly, to production of ball valve from titanium-carbide-based cermet. Ball valve cermet structure consists of alternating zones of continuous metal matrix and isolated uniformly distributed carbide grains and zones with continuous metal matrix and uniformly distributed carbide grains that make a continuous carcass. Content of metal matrix in cermet makes 25-70 vol. %. Ball valve made, mould with porous carbide semi after sintering is not withdrawn from the furnace, its temperature being maintained above liquidus temperature of impregnating metal. The latter is fused in crucible arranged in the same chamber, filled in the mould to contact with carbide semi and maintained for time interval required for complete infiltration of metal melt and directed crystallisation of metal in semi pores.EFFECT: higher quality of ball valve made of cermet.2 cl, 6 dwg, 4 ex |
