| 摘要 |
PURPOSE:To harden stably the surface of steel at a low cost by embedding the steel in powder obtd. by mixing powder of a group IVa, Va or VIa metal in the periodic table with refractory powder and halide in a specified ratio and by heating the mixed powder in vacuum. CONSTITUTION:Steel is embedded in powder obtd. by mixing 10-60wt% powder of one or more kinds of metals selected among the group IVa, Va and VIa metals in the periodic table and alloys thereof with 30-85wt% refractory powder and 0.2-30wt% halide and the mixed powder is heated to about 700-1,200 deg.C in vacuum to form a layer of the hard carbide of the selected metals on the surface of the steel. Since air, steam, etc., in the mixed powder are removed by evacuation, the oxidation of the steel and the powder is prevented to form stably the carbide layer and to prolong the endurance life of the powder, so the cost can be reduced.
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