| 摘要 |
PROBLEM TO BE SOLVED: To provide an HIP method by which shrinkage anisotropy is reduced at the time of sintering a powdery brittle material having brittleness even at the sintering temp. SOLUTION: When a capsule is filled with a powdery brittle material such as Y2 O3 , Si3 N4 or Nb5 Si3 and the material is subjected to HIP by which it is sintered by heating under isostatic pressure, isostatic pressure is applied after the material attains to a temp. >=0.8 time as high as the sintering temp. (expressed in terms of absolute temp.). Since shrinkage anisotropy is remarkably reduced at the time of sintering the powdery brittle material such as ceramics or an intermetallic compd. having brittleness even at the sintering temp., parts having a complex shape are easily obtd. by sintering in a near-net shape with the powdery brittle material, the number of precision finishing processes is reduced and a superior economical effect is produced. |
