초록 ▼

Composite articles, cutting tools and wear parts are prepared by densification of a mixture comprising whiskers, fibers, or particles of hard refractory transition metal carbides, nitrides or carbonitrides uniformly distributed in a titanium diboride matrix. Optionally, other dispersoids may also be

Composite articles, cutting tools and wear parts are prepared by densification of a mixture comprising whiskers, fibers, or particles of hard refractory transition metal carbides, nitrides or carbonitrides uniformly distributed in a titanium diboride matrix. Optionally, other dispersoids may also be incorporated. The preferred composite article or cutting tool has a fracture toughness equal to or greater than about 2.5 MNㆍm½. Methods of preparation and use are also disclosed.

대표청구항 ▼

A densified, hard, abrasion resistant ceramic-based composite article consisting essentially of: about 5-60 volume percent of one or more first dispersoids selected from the group consisting of whiskers and chopped fibers of refractory carbides, nitrides, and carbonitrides of titanium, zirconium, ha

A densified, hard, abrasion resistant ceramic-based composite article consisting essentially of: about 5-60 volume percent of one or more first dispersoids selected from the group consisting of whiskers and chopped fibers of refractory carbides, nitrides, and carbonitrides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten, and solid solutions thereof, uniformly distributed in a matrix of titanium diboride; and about 5-55 volume percent of one or more other dispersoids selected from the group consisting of particles of refractory carbides, nitrides, and carbonitrides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten, and solid solutions thereof, and whiskers, fibers, and particles of hard refractory hafnium diboride, tungsten diboride, silicon nitride, alumina, zirconia, and hafnia, and mixtures and solid solutions thereof, the combined percent of all dispersoids not exceeding about 60 volume percent.