高純度アルミナセラミックスのタングステン及びモリブデンメタライジング

概要

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The moralizing of high-Al_2O_3 ceramics (purity>99%) with W or Mo was investigated by painting W, Mo, H_2WO_4 or H_2MoO_4 powder on the Al_2O_3 substrate and heating at 1400℃ in H_2 or Ar. When heated in H_2, where H_2WO_4 and H_2MoO_4 were reduced to W and Mo, the bonding of W and Mo coatings to Al_2O_3 was very weak for all metal sources. This may be explained by the insufficient amount of glass component, mainly SiO_2, in Al_2O_3 substrate to bond metal phase. When heated in Ar, on; the other hand, H_2WO_4 gave W coating tightly bonded to Al_2O_3, although H_2MoO_4 did not form Mo coating. The metallic W may be produced by the thermal decomposition of W-oxide in Ar and bound to the substrate with a glass phase formed by the reaction between W-oxide and Al_2O_3 When Ni was joined to the substrate above the melting point, a large gap was observed at the interface between Ni and non-metallized Al_2O_3 substrate. On the other hand, Ni adhered tightly to W-metallized Al_2O_3 substrate, indicating that W phase played a role as an intermediate bonding layer between Ni and Al_2O_3.
社団法人日本セラミックス協会の論文
1990-07-01