一定応力下での窒化アルミニウム焼結体の曲げクリープ

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  • Bending Creep of Polycrystalline AlN at Stress Constant
  • イッテイ オウリョクカ デ ノ チッカ アルミニウム ショウケツタイ ノ マゲ

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Creep behavior of hot-pressed polycrystalline AlN without additives was studied by three point bending technique using graphite knife edge. The creep tests were conducted at a constant stress of 40 to 1400kg/cm2 and a temperature of 1520° to 2000°C in nitrogen atmosphere. The stress exponent (n) in creep equation was 1.0 to 1.2 for fully dense polycrystalline AlN materials and 1.3 to 1.6 for the materials with the porosity of 4 to 5%. Although these obtained stress exponent values were not strictly equal to 1, it was suggested that the main mechanism of the creep of the polycrystalline AlN was diffusion. The reason why the stress exponents were higher than 1, should be correlated with (1) dislocation movement during the creep, (2) impurity phases on grain boundary and (3) micro-cracks and separation of grain boundary. And also, the fact that higher stress exponent valnes were obtained in not-well hot-pressed materials, may support that the cause came from micro-cracks and separation of grain boundary rather than from dislocation movement and impurity phases, although the existence of the crack and separation was not confirmed under microscopic observation. The activation energy of the creep of polycryctalline AlN materials was in the rangy of 95 to 110kcal/mol.

収録刊行物

  • 窯業協會誌

    窯業協會誌 88 (1023), 680-686, 1980

    公益社団法人 日本セラミックス協会

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