ホットプレスによるタングステンホウ化物焼結体の作製

概要

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WB and W2B5 powders containing 10 mol% excess amorphous boron, which was compensated by the addition of tungsten powder to keep the respective stoichiometries, were hot-pressed at the treatment con-ditions of 20 MPa and 1900°C for 30 min. The sintered compacts of WB and W2B5 were prepared as single crystalline phases. Microstructure and sintering behavior of WB sintered compact, which showed a plastic flow type sintering behavior, were greatly different from those of W2B5. Microhardness of WB and W2B5 sintered compacts was 2600 and 2700 kg/mm2, and the transverse strength was 57 and 43 kg/mm2, respectively. Coefficient of linear thermal expansion of WB and W2B5 compacts was 5.3×10-6 and 4.7×10-6 deg-1 at room temperature, and 7.3×10-6 and 6.8×10-6 deg-1 at temperatures above 400°C, respectively.
社団法人粉体粉末冶金協会の論文