チタンアルミナイドの合成同時成形プロセスの開発

铝化钛同步合成成型工艺开发

• 批准号: 11750639
• 负责人: 小橋 真
• 金额: $ 1.41万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Young Scientists (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11750639/
• 关键词: 燃焼合成; TiAl; 圧縮加工; 反応熱; 複合材料; TiC; TiB_2; 鍛造; 気孔率; Ti_3Al; Al_3Ti

TiAl金属間化合物およびその複合材料を燃焼合成により製造し,試料が反応熱により高温である間に圧縮加工を施し,合成・緻密化・成形を単一の過程で達成するプロセスの開発を試みた.元素粉末として,純チタン粉末,純アルミニウム粉末を用いた.また.反応熱の放出・吸収材として,それぞれB_4C,TiCを用いた.圧粉体を金型中に設置し,試料側面を加熱して燃焼合成反応を誘起し,反応直後に500mm/minの速度で圧縮変形(最大荷重:2ton)を付与した.混合粉末圧粉体を加熱することにより燃焼合成反応を生じ,TiAl系金属間化合物,または,その複合材料を合成することが可能であった.TiとAlのみの圧粉体に比べ,TiCを添加した試料では反応熱による温度上昇が抑制され,逆にB_4Cを添加した試料では,熱量が増加した.次に,燃焼合成直後,高温状態である試料に圧縮荷重を負荷し変形抵抗を測定した.TiCを添加すると試料温度の上昇が抑制されるので,圧縮荷重(変形抵抗)が大きくなるが,B_4Cを添加した場合には,変形抵抗は小さくなる.燃焼合成後に圧縮,成形した試料は,いずれも金型形状と同じ円柱形に成形された.TiAlおよびTiC粒子を添加したTiAlは表面に多少の凸凹がみられるものの,B_4Cを添加した試料では,平坦な表面が得られた.次に圧下率と試料内部の気孔率との関連を調査した結果,いずれの試料でも,圧下率の増加に伴い気孔率が減少した.また,B_4Cを添加した試料では,最大荷重(2ton)負荷時の圧下率が50%以上であり,気孔率が2-3%の試料を製造することができた.

TiAl intermetallic compounds and composites are produced by combustion synthesis. The samples are heated at high temperatures. The compression processing is carried out. The synthesis, densification and molding processes are carried out in a single process. Elemental powders, pure powders, pure powders are used.また. The emission and absorption of heat in the reaction system are mainly composed of B_4C and TiC. The pressure powder is set in the metal mold, the sample bottom is heated, the combustion synthesis reaction is induced, and the pressure deformation (maximum load:2 tons) is applied at a speed of 500mm/min after the reaction. When mixed powders are heated, combustion synthesis reaction occurs,TiAl intermetallic compounds are synthesized, and composite materials are synthesized.Ti and Al intermetallic powders are heated,TiC is added, and the temperature rise is suppressed, and B_4C is added, and the heat is increased. After combustion synthesis, the compression load and the shape resistance of the sample under high temperature condition were measured. When TiC was added, the temperature rise of the sample was suppressed, and the compression load (shape resistance) was increased. When B_4C was added, the shape resistance was decreased. After combustion synthesis, the sample was compressed and formed.TiAl and TiC particles were added to the TiAl surface. The relationship between pressure reduction rate and gas porosity inside the sample was investigated. The results showed that the increase of pressure reduction rate was accompanied by decrease of gas porosity in the sample. When B_4C is added to the sample, the pressure reduction rate at the maximum load (2 tons) is more than 50%, and the porosity of the sample is 2-3%.