高温高圧下におけるモリブデン-炭化物系セラミックスの固相界面反応とその接合技術への応用(<小特集>セラミック材料小特集)

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Diffusion couples of molybdenum with several carbides, i.e. SiC, B_4C, TiC, ZrC, HfC and TaC, were heated at various temperatures ranging from 1500 to 1840℃ under high pressures of 3 GPa and 100 MPa for up to 4 hr. The couples were then examined for the composition of reaction products, the growth rate of reaction layers, interfacial structures, and tensile strength. In case of Mo-transition metal carbides, Mo_2C layer was mainly formed, so that the carbides, which had supplied carbon, resulted in having the nonstoichiometric composition near the interface. The activation energy for the growth of Mo_2C layer in Mo-TiC system was 332 kJ/mol, and that in Mo-TaC system was 366 kJ/mol. In Mo-SiC system, Mo_2C layer, the mixed phase of Mo_2C and Mo_5Si_3, and Mo_5Si_3C layer were formed in order from the Mo side. In Mo-B_4C system, the mixed phase of Mo_2B and MoB, and Mo_2BC layer appeared. The decomposed graphite from B_4C was also observed between B_4C and Mo_2BC phase. The activation energy for the growth of total reaction layer in Mo-SiC system was 531 kJ/mol, and that in Mo-B_4C system was 183 kJ/mol. It can be said that the growth of reaction layers is controlled by diffusion. The orientation of crystals was observed in all reaction products except for Mo_2BC phase in Mo-B_4C system and (Mo, Ta)_2C phase in Mo-TaC system. In HIPed couples, the magnitude of tensile strength was dependent on the difference in thermal expansion coefficient between Mo and carbides. HIPed Mo-TaC couple had the best weldability among the systems examined in the present investigation.
社団法人日本材料学会の論文
1986-01-15

高温高圧下におけるモリブデン-炭化物系セラミックスの固相界面反応とその接合技術への応用(<小特集>セラミック材料小特集)

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