Abstract
Some basic properties of CrSi2 as a refractory hard material have been investigated. CrSi2 powder was prepared by arc melting of pure chromium and silicon mixture in an argon atmosphere and subsequently crushed by ball mill. This powder was then hot-pressed in vaccum.
The specimens obtained were subjected to various tests, the results of which are summarized as follows.
1 The optimum temperature in hot-pressing of CrSi2 was 1350°C. The density attained 97.0% of the theoretical value.
2 Corrosion resistances to three kinds of dilute acids were superior to any other Disilisides which we had studied.
3 The oxidation resistance at 1200°C was 0.0011g/cm2/day.
4 Electrical resistance at room temperature was 646×10-6Ω-cm, 1900×10-6Ω-cm at 800°C.
5 Thermo electromotive force at room and high temperature was 30 to 60 times higher than that of MoSi2 and TiSi2.
6 In general, the hardness in hot state decreases with rising temperature. For instance, it was 280 at 800°C.
7 Modulus of rupture at 800°C was 21.3kg/mm2.
8 The thermal shock resistance of CrSi2 was poor.
