TiB<SUB>2</SUB>基サーメットの機械的性質に及ぼす結合剤および二ホウ化金属添加の影響

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概要

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• TiB<SUB>2</SUB> must be used in a composite form having a high mechanical strength for use in application. When Ni4B3, (or NiB, or CoB) was added to TiB<SUB>2</SUB>, they were found to compose a strong cermet. However, it is still not clear how the sintering conditions effect the mechanical properties of the alloys.<BR>This paper describes, firstly, the effects of the sintering temperatures on the mechanical properties of TiB<SUB>2</SUB>-8.8%Ni<SUB>4</SUB>B<SUB>3</SUB>, TiB<SUB>2</SUB>-l1%NiB, TiB<SUB>2</SUB>-11.3%CoB, and TiB<SUB>2</SUB>-10.4%FeB sintered alloys; secondary, the effect of the sintering conditions such as the amount of binders and sintering time on those of TiB<SUB>2</SUB>-NiB and TiB<SUB>2</SUB>-Ni<SUB>4</SUB>B<SUB>3</SUB> sintered alloys; finally, the additive effects of metal-diboride on the mechanical properties of compacts in the case of using a direct flow method of electric current. The results were as follows:<BR>1. NiB is the best binder for TiB<SUB>2</SUB>-binder alloys.<BR>2. When a TiB<SUB>2</SUB>-binder mixed powder sample is sintered and well compacted, TiB<SUB>2</SUB> grains grow markedly. Therefore, the transverse rupture strength of these alloys showed a marked decreased.<BR>3. Additive metal-diborides restrain the growth of the TiB<SUB>2</SUB> grains with the following composites, TiB<SUB>2</SUB>-5%VB<SUB>2</SUB>-1%CoB, TiB<SUB>2</SUB>-5%VB<SUB>2</SUB>-1%FeB, TiB<SUB>2</SUB>-5%NbB<SUB>2</SUB>-1%NiB, TiB<SUB>2</SUB>-5%NbB<SUB>2</SUB>-1%CoB, TiB<SUB>2</SUB>-5%NbB<SUB>2</SUB>-1 %FeB, TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%NiB, TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%CoB, TiB<SUB>2</SUB>-5%TaB<SUB>2</SUB>-1%FeB, TiB<SUB>2</SUB>-5%CrB<SUB>2</SUB>-1%CoB, TiB<SUB>2</SUB>-5%MoB<SUB>2</SUB>-1%NiB and TiB<SUB>2</SUB>-5%MoB<SUB>2</SUB>-1%CoB. Therefore these compacts have a high transverse rupture strength and a high density. 4. These three component system sintered alloys have a Vickers hardness (300 g load) Hv of 900-1100 kg/mm<SUP>2</SUP> at 700°C.

• 社団法人 粉体粉末冶金協会の論文

著者

• 渡辺 忠彦

  工業技術院九州工業技術試験所

• 清水 浩樹

  帝国ピストリング

• 宮川 新一

  博多高等学校

• 渡辺 忠彦

  工業技術院 九州工業技術試験所

• 清水 浩樹

  帝国ピストンリング(株)

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• TiB2-5%TaB2-1%CoBおよびTiB2-5%W2B5-1%CoB焼結体の強化機構
• TiB2-TaB2基サーメットの機械的性質に及ぼす結合剤の影響
• TiB2基サーメットの機械的性質に及ぼす結合剤および二ホウ化金属添加の影響

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