金属溶湯とセラミックス粒子の複合化における発熱反応による臨界溶浸圧の低下

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タイトル別名
  • Lowering the Threshold Infiltration Pressure by Exothermic Reaction in Incorporation of Molten Metal and Ceramics Particles
  • キンゾク ヨウトウ ト セラミックス リュウシ ノ フクゴウカ ニ オケル ハ

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抄録

  To realize full infiltration of non-wetted composite systems with a low applied pressure, the Al2O3 particle (mean diameter : 302 μm) /molten Al system was studied as a model composite. Pressure infiltration was performed using an Al2O3 particle preform premixed with Ti powder in the temperature range of 1023 ∼ 1143 K. The threshold infiltration pressure is lowered from 19.5 kPa to 10.8 kPa at 1023 K by the premixing of 5.3 mass % Ti powder to Al2O3 particles. The size of non-infiltrated defects appeared at a contact point of two particles also becomes smaller by the same procedure, especially they disappear in the composites infiltrated at 1143 K with an applied pressure of 25 kPa. The wettability of Al2O3/Al system is improved by premixed Ti powder, which arises from the mixed surface consisted of non-wetted Al2O3 and wetted Ti, and also the exotherm due to formation of intermetallic TiAl3. Hence, reinforcements premixed with Ti powder can be utilized to achieve full infiltration with a low applied pressure in liquid processing of non-wetted composite systems.

収録刊行物

  • 鋳物

    鋳物 65 (2), 106-111, 1993

    公益社団法人 日本鋳造工学会

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