METHOD FOR PRODUCING BORON CARBIDE-CONTAINING CERAMIC JOINED BODY AND BORON CARBIDE-CONTAINING CERAMIC JOINED BODY

摘要

PROBLEM TO BE SOLVED: To provide a technique for obtaining a boron carbide-containing ceramic joined body in which when boron carbide-based ceramics are joined to each other, high joining strength can be achieved at a lower temperature, and also a joined portion of the obtained boron carbide-containing ceramic joined body has non-conventional excellent durability against long term use and which is therefore suitable for practical application.SOLUTION: The boron carbide-containing ceramic joined body is provided in which: boron carbide ceramic members containing 60 mass% or more of boron carbide are integrated via a joint layer composed of an aluminum-silicon alloy having a silicon content of 5 to 25 mass%; a joined portion has a strength of 100 MPa or more; the joint layer has a melting point lower than a melting point of aluminum of 660°C; a change in the volume of the joint layer which occurs when the joint layer solidifies from a molten state by cooling is 5.5% or less; and the joint layer has a thermal expansion coefficient of 18×10to 22×10(1/°C).