Mechanical and Physical Properties of Cr Containing Mo2NiB2 Ternary Boride

概要

論文の詳細を見る
Mechanical and physical properties of Cr containing Mo2NiB2 ternary borides were studied for (Mo2-XNi1-XCr2X)B2 compositions. X is set to 0, 0.25, 0.50 and 0.75 corresponding to the mixing compositions about 0, 5, 10 and 15 mass%. Dense Mo2NiB2 ternary borides were formed from the powders of Mo, MoB, Ni and CrB by reaction boronizing sintering with transient liquid phase. As a result, crystal structure of Mo2NiB2 ternary boride changed from orthorhombic to tetragonal around at 15 mass% Cr. Cr containing Mo2NiB2 ternary borides, especially 10 and 15 mass% Cr added borides exhibit high hardness and high elastic modulus comparable to WC and TiC. Cr containing Mo2NiB2 ternary boride is suitable alternative materials to wear resistant hard materials such as WC.