常圧焼結窒化ケイ素の高温引張試験

概要

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High temperature tensile teat were carried out at various displacement tates. The main results obtained are as follows. (1) Fracture strength decreased sharply at temperatures beyond 1000℃. (2) No non-linear load-displacement relation was observed at a displacement rate equal to 0.6 mm/min at either 900℃ or 1000℃. Under these test conditions, high temperature slow crack .growth (H.T. SCG), which is creep damage, was not observed and fracture originated from the defects such as pores or inclusions. (3) Non-linear foad-displacement relation was observed at a displacement rate equal to or smaller than 0.06 mm/min at 1100℃. Non-linear deformation increased as the displacement rate decreased. In this case, high temperature slow crack growth was observed and fracture originated mainly from high tem'perature SCG. (4) Fracture strength at 900℃ was dominated by either defects such as pores or high temperature damage. Softening of the glass phase due to O^2 diffusion at this temperature may be attributable to this damage. Creep damage appeared at temperatures equal to or higher than 1100℃. At 1200℃, fracture strength was mainly dominated by creep damage.
社団法人日本材料学会の論文
1990-06-15