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论文类型：期刊论文

发表时间：2018-05-01

发表刊物：JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：255

页面范围：340-346

ISSN号：0924-0136

关键字：Laser cutting; Al2O3 ceramic; Removal particles; Morphology investigation; Vapor-to-melt ratio

摘要：An investigation of particle morphology based on vapor-to-melt ratio is carried out to reflect the relationship between the forms of material removal and effects of cutting process. The influences of vapor-to-melt ratio on morphology of removal particles (average diameter, diameter distribution, sphericity, spheroidization rate and density distribution) is investigated by the experimental observation and analysis. It is shown that, a steady processing state with maximum average diameter, concentrated distribution, better sphericity, lager spheroidization rate and higher hollow proportion of removal particles is obtained at a relatively large value of vapor to-melt ratio. However, at a too high value of vapor-to-melt ratio, a small quantity of material breaks and strips in a substrate form by the hot tearing effect of material. These irregular residues are mixed in the total removal collection, thereby reducing the average sphericity of the overall removal. When the particle diameter is greater than 100 mu m, a complete cavity is formed close to the center, and the diameter is about 1/2 that of the whole particle.