Sintering Mechanisms of Mn Containing Mo2NiB2 Boride Base Cermets

Nishi Mari, Yamasaki Yuji, Takagi Kenichi

doi:10.2320/jinstmet1952.65.9_775

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Mnを添加したMo2NiB2型複硼化物系サーメットの焼結挙動
Mnを添加した Mo2NiB2型複硼化物系サーメットの焼結挙動
Mn オテンカシタ Mo2NiB2ガタフクホウカブツケイサーメットノショウケツキョドウ

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Abstract

The liquid phase sintering behavior of the Mo₂NiB₂ base cermets was investigated by using Ni-5 mass%B-53.25 mass%-0, 5, 10 mass%Mn model cermets. Mo₂NiB₂ complex boride base cermets consisting of the Mo₂NiB₂ hard phase and Ni base binder were produced from powder mixtures of Ni₂B, Mo₂B₅, Mo, Ni and Mn. Full densification of the cermets was achieved by the quasi-eutectic liquid phase between the Ni binder and Mo₂NiB₂ hard phase associated with a diffusion reactive sintering process. Orthorhombic Mo₂NiB₂ was formed during solid state sintering as a result of the reaction among NiB, Ni and Mo for the compacts without Mn and the reaction among MoB, Ni and Mo for the Mn containing compacts. Additions of Mn resulted in increasing the Mo₂NiB₂ forming temperature and decreasing the eutectic liquid phase formation temperature between Ni binder and the Mo₂NiB₂ hard phase. The size and dispersion of the boride phase changed depending on the sintering conditions, those are the liquid phase formation temperature and the amount of the liquid phase during sintering.

Journal

Journal of the Japan Institute of Metals and Materials

Journal of the Japan Institute of Metals and Materials 65 (9), 775-778, 2001

The Japan Institute of Metals and Materials

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Sintering Mechanisms of Mn Containing Mo<SUB>2</SUB>NiB<SUB>2</SUB> Boride Base Cermets