발간논문

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Vol.35, No.10, 1380 ~ 1386, 1997
Title
Phae Transformation Behaviours and High Temperature Mechanical Properties of Plasma Sprayed Mo and Co Alloy Coating Layers
남태현 , 조규봉 , 하국현 , 김병기 , 이수완 Tae Hyun Nam , Gyu Bong Cho , Gook Hyun Ha , Byung Kee Kim , Soo W Lee
Abstract
Phase transformation behaviours and high temperature mechanical properties of Mo and Co alloy coating layers made by plasma spray coating method have been investigated by means of optical microscopy, X-ray diffraction, high temperature microvickers hardness and wear tests. The splat is relatively flat with the boundary in Mo coating layers, whereas wavy in Co alloy coating layers at high temperature. Crystallization of Co alloy coating layers which were amorphous at room temperature started to occur at about 1073 K and consequently Co_7Mo_6 and Co₃Ma compounds were formed. Wear volume of Co alloy coating layers almost kept constant with increasing temperature below 1073 K, and then started to increase at 1073 K. This was attributed to the crystallization which resulted in decrease in hardness- Wear resistance of Co alloy coating layers was superior to that of Mo coating layer overall test temperatures.
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