| 摘要 |
PROBLEM TO BE SOLVED: To obtain a metal-ceramic composite material high in strengths not only at the ordinary temperature but also at high temperatures by impregnating a preform using AlN particles having a prescribed maximum particle diameter as a reinforcing material with Al or its alloy by a high pressure cast method. SOLUTION: The maximum particle diameter of AlN particles herein used is 10-50μm. This method for producing this composite material comprises adding polyvinyl alcohol to the AlN powder having the maximum particle diameter of 50 or 10μm, drying the mixture, charging the dried mixture into a mold in a charging degree of 45% in the case of the maximum particle diameter of 50μm or in a charging degree of 55% in the case of the maximum particle diameter of 10μm, pressing the charged mixture with a pressure of 200kgf/cm<2> for 3min to form a preform (100×50×15mm), cutting out a disk (diameter: 50mm, thickness: 15mm) from the preform, setting the disk in a columnar mold (diameter: 50mm, height: 50mm) for casting Al, separately charging an Al alloy (e.g. AC7A) into a graphite crucible for casting, thermally melting the alloy at 750 deg.C, pouring the melted alloy into the columnar mold and subsequently pressing the mold with a punch bar under a pressure of 50MPa for 3min.
|
