タングステンホウ化物の合成におよぼす雰囲気処理の効果(<小特集>粉体小特集)

概要

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The effect of atmosphere of heat treatment on the formation of tungsten borided was investigated by the solid state reaction between tungsten and amorphous boron, in which the formation ranges and synthetic conditions of WB and W_2B_5 solid solutions were determined. The low tenperature activation treatment at 500℃ in a hydrogen stream promoted the boride formation in the subsequent heat treatment. Since a coexisting phase tended to from in the case of WB synthesis, the pretreatment at about 1000℃ in an argon stream prior to the final heat treatment, was required to obtain a homogeneous composition of specimen. WB solid solution had a narrow formation range of B/W=1.0-1.2, while W_2B_5 solid solution had a wide formation range of B/W=1.75-2.75. The formation amount of WB or W_2B_5 solid solution showed the maximum at the composition of mixed power which contains 10 at% boron in excess of the stoichiometric composition of each boride. The synthesized tungsten boride powder with uniform grain size of 0.5 was expected to have a good sinterability.
社団法人日本材料学会の論文
1987-11-15