Composition and process for making an engine valve

Details Composition and process for making an engine valve Composition and process for making an engine valve

1993-08-27

1995-06-06

Group, Karl

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 88, 501 90, 1231881, 1231883, C04B 35565

Patent

active

054223210

ABSTRACT:
The present invention discloses a composition for a valve of an advanced heat engine. The valve comprises grains of aluminum-doped silicon carbide. The grains are of two main types: (1) a matrix of equi-axed grains of alpha and beta SiC for optimum distribution of mechanical properties; and (2) elongated grains of alpha SiC which are distributed within the matrix for reinforcement. The invention also comprises a process for making such valves. The process begins with a powder of aluminum-doped beta-silicon carbide. A binder and a solvent are then added to the powder, and the mixture is agitated while being heated. The mixture is then transferred to an injection mold which is used to form a molded component. The molded component is then sintered and machined into desired dimensions. An annealing step is then performed so that the component exhibits the characteristics of improved strength and toughness.

REFERENCES:
patent: 4041117 (1977-08-01), Prochazka
patent: 4928645 (1990-05-01), Berneburg

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