Some basic properties of TiSi2 as a refractory hard material have been investigated. TiSi2 powder was prepared by arc melting in an argon atmosphere of pure titanium and silicon mixture and subsequent crushinged 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 TiSi2 was 1380°C. The density attained 99.8% of the theoretical value. (2) The oxidation resistance at 1100°C was 0.0005 g/cm2/day. (3) In general, the hardness in hot state decreases with rising temperature. For instance, it was 230 (HV) at 800°C. (4) The corrosion resistance was is good against hydrochloric acid and sulpheric acid, while it was not so good against nitric acid. (5) The thermal schock resistance of TiSi2 was poor. (6) TiSi2 was well wetted by Fe,Ni,Co. (7) Ag does not wet TiSi2.
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