抄録
Tungsten-chromium sintered compacts were hot-pressed at 1450°C for 30 min in graphite moulds. Mechanical properties and high-temperature oxidation resistance of sintered compacts were tested. And also the improvement of oxidation resistance by small additions of Al and Si was tested.
Results obtained are summarized as follows.
(1) The density of the hot-pressed specimens were more than 95% of the theoretical value.
(2) The hardness of the sintered compacts was HRC 56.6-63.0, higher than the hardness of tungsten.
(3) Transverse rupture strengths of 30-40kg/mm2 were obtained.
(4) The addition of Cr (>30 wt%) was found to improve the oxidation resistance.
(5) (W-30 Cr)-Si alloy was suitable for tungsten-base high temperature materials.
