2 results about "Tantalum carbide" patented technology

The invention provides a method of forming a dense, shaped article, such as a crucible, formed of a refractory material, the method comprising the steps of placing a refractory material having a melting point of at least about 2900° C. in a mold configured to form the powder into an approximation of the desired shape. The mold containing the powder is treated at a temperature and pressure sufficient to form a shape-sustaining molded powder that conforms to the shape of the mold, wherein the treating step involves sintering or isostatic pressing. The shape-sustaining molded powder can be machined into the final desired shap and then sintered at a temperature and for a time sufficient to produce a dense, shaped article having a density of greater than about 90% and very low open porosity. Preferred refractory materials include tantalum carbide and niobium carbide.

The invention discloses a high-temperature-resisting knuckle bearing for an actuator and belongs to the technical field of structural design. The knuckle bearing is composed of a rod end shaft sleeve and a shaft core. The shaft core is formed by a mesh-shaped alloy framework and ceramic powder through a high-temperature sintering process. The whole knuckle bearing is formed in a process channel of the shaft core embedding rod end shaft sleeve. The mesh-shaped alloy framework is formed by welding high-temperature alloy wires of different diameters or formed through 3D printing, the ceramic powder is hafnium carbide or zirconium carbide or tantalum carbide, the ceramic powder and the mesh-shaped alloy framework are evenly and densely combined, and the whole shaft core is formed. According to the high-temperature-resisting knuckle bearing for the actuator, the stress strength of the knuckle bearing in work can be guaranteed while thermal transmission in the working state is prevented, and the service life of the knuckle bearing can be prolonged.