초록 ▼

A dense ceramic workpiece is made by a process of combining a powdered 312 component, e.g., Ti.sub.3 SiC.sub.2, with a powdered component that is soluble in the 312 component, e.g., TiSi.sub.2 in Ti.sub.3 SiC.sub.2, forming the mixture into a green body, heating the green body under pressureless sin

A dense ceramic workpiece is made by a process of combining a powdered 312 component, e.g., Ti.sub.3 SiC.sub.2, with a powdered component that is soluble in the 312 component, e.g., TiSi.sub.2 in Ti.sub.3 SiC.sub.2, forming the mixture into a green body, heating the green body under pressureless sintering conditions to a temperature above a point at which a liquid is formed but below the melting point of the 312 compound to yield a dense ceramic workpiece, and thereafter cooling the dense 312 ceramic workpiece.

대표청구항 ▼

[ We claim:] [1.] A process for making a dense ceramic workpiece which comprises(i) mixing a powdered Ti.sub.3 XC.sub.2 component, where X is selected from the group consisting of Si, Ge, Al and Ga, and a powdered component that is soluble in a solid phase of Ti.sub.3 XC.sub.2, the soluble component

[ We claim:] [1.] A process for making a dense ceramic workpiece which comprises(i) mixing a powdered Ti.sub.3 XC.sub.2 component, where X is selected from the group consisting of Si, Ge, Al and Ga, and a powdered component that is soluble in a solid phase of Ti.sub.3 XC.sub.2, the soluble component having a melting point below that of Ti.sub.3 XC.sub.2 and being present in an amount of from about 0.1% to about 20% by volume based on the volume of the Ti.sub.3 XC.sub.2 component, to provide a homogeneous mixture;(ii) forming the homogeneous mixture into a green body;(iii) heating the green body under a non-oxidizing atmosphere without the application of significant pressure to a temperature above a point at which a liquid is formed in the green body but below the melting point of Ti.sub.3 XC.sub.2 ;(iv) maintaining the heated green body at said temperature for a period of time sufficient to produce a ceramic workpiece with at least 80% of theoretical density; and(v) cooling the Ti.sub.3 XC.sub.2 ceramic workpiece below said temperature at which a liquid is formed in the green body.