| 简介 |
FIELD : chemistry.
SUBSTANCE : composite material contains boron suboxide and a second phase which contains a mixture of at least two metal oxides, neither of which is a boron-containing oxide. At least one of the oxides can be selected from a group comprising oxides of group IIA, IIIA and IVA elements. Also, at least one of the oxides can be a rare-earth metal oxide selected from a group comprising oxides of scandium, yttrium and lanthanide elements. The second phase of the composite material can also contain a boride and particularly a boride selected from a group comprising borides of group IV-VIII transition metals. To produce the composite material, boron suboxide grains are mixed with metal oxides and the reaction mass is sintered at temperature of 1740-1900°C and pressure of 200 MPa.
EFFECT : improved crack resistance of the composite material.
22 cl, 13 ex, 1 tbl, 5 dwg |
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