High performance ceramic composites containing tungsten carbide

Details High performance ceramic composites containing tungsten carbide High performance ceramic composites containing tungsten carbide

1994-10-11

1996-12-03

Marcantoni, Paul

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 93, 75240, C04B 3556

Patent

active

055808336

ABSTRACT:
A high performance ceramic composite containing tungsten carbide reinforced chromium carbide matrix in which 5.about.35 vol % of tungsten carbide particles are uniformly dispersed in 65.about.95 vol % of chromium carbide matrix. The diameters of the tungsten carbide and chromium carbide particles are preferably in the rage between 0.1.about.10 .mu.m, and their average diameters are preferably at about 2.0 and 1.5 .mu.m, respectively. The tungsten carbide/chromium carbide composite is prepared from a sintering process by applying heat and pressure to a green compact containing tungsten carbide and chromium carbide particles, without using a metallic sintering aid. As a result, the tungsten carbide reinforced chromium carbide composite retains all the advantageous characteristics of the chromium carbide material, such as excellent strength, hardness, anti-oxidation, anti-scaling, anti-erosion and anti-corrosion properties as well as excellent permanent non-magnetizability and surface lustrousness, while providing improved flexural strength and fracture toughness. The tungsten carbide reinforced chromium carbide composite is most suitable for industrial applications where reliability is critical.

REFERENCES:
patent: 3552937 (1971-01-01), Mito et al.
patent: 4927791 (1990-05-01), Isozaki et al.
patent: 4945073 (1990-07-01), Dubensky et al.
patent: 4963183 (1990-10-01), Hong
patent: 5141571 (1992-08-01), DuBois
Japanese Patent Abstract-"Sliding Member and its Product and Thermal Spraying Material Used Therefor" Kuman et al. JP 04-147956 (1992).
Japanese Patent Abstract-"Mold for Optical Element" Shibazaki et al. JP 01-286964 (1990).

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