Research Status and Prospect on Polishing Technology of Large Size Single Crystal Diamond Substrate

doi:10.3901/JME.2021.22.157

Abstract

Abstract: Non-metallic inclusions in the matrix of metal parts are inevitable and have a serious impact on the mechanical properties of the matrix. Forging deformation is a main way to make non-metallic inclusions break and disperse in the metal matrix. Taking the common hard Al₂O₃ inclusions in steel as the research object, metal samples containing Al₂O₃ inclusions with different porosities are prepared by powder metallurgy technology combined with 3D printing cladding forming technology. The forging experiments of metal samples containing Al₂O₃ inclusions under a series of deformation conditions are carried out. The effects of porosity of inclusions and forging process parameters (deformation temperature, deformation speed and deformation path) on the crushing and dispersion behavior of Al₂O₃ inclusions are studied by observing the morphology of Al₂O₃ inclusions after deformation. The results show that the higher the porosity of inclusions, the more likely to be broken. Lowering the deformation temperature or increasing the deformation speed can promote the crushing and dispersion of Al₂O₃ inclusions with higher porosity; for Al₂O₃ inclusions with lower porosity, increasing the deformation temperature is the main way to aggravate the degree of crushing. At the same time, the complexity of the deformation path can significantly increase the crushing and promote the further dispersion of Al₂O₃ inclusions in the metal matrix.

Key words: single crystal diamond, polishing, material removal rate, surface roughness, removal mechanism

CLC Number:

TN305

WEN Hailang, XIAO Ping, LU Jing. Research Status and Prospect on Polishing Technology of Large Size Single Crystal Diamond Substrate[J]. Journal of Mechanical Engineering, 2021, 57(22): 157-171.

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