影响低温釉性质因素的探讨

由于能源的短缺和环保的要求,陶瓷行业的低温釉正成为研究的热点。但是含铅的低温釉不但其研磨硬度较差,而且铅含量高影响环保,因此应开发兼顾节能、耐磨和环保性能的新型陶瓷低温釉。本文使用硼和锶为添加剂,成功地制备了无铅低温釉,对釉的性质进行了测试与分析。

Relationship between subsurface damage and surface roughness of ground optical materials

A theoretical model of relationship between subsurface damage and surface roughness was established to realize rapid and non-destructive measurement of subsurface damage of ground optical materials.Postulated condition of the model was that subsurface damage depth and peak-to-valley surface roughness are equal to depth of radial and lateral cracks in brittle surface induced by small-radius(radius≤200 μm)spherical indenter,respectively.And contribution of elastic stress field to the radial cracks propagation was also considered in the loading cycle.Subsurface damage depth of ground BK7 glasses was measured by magnetorheological finishing spot technique to validate theoretical ratio of subsurface damage to surface roughness.The results show that the ratio is directly proportional to load of abrasive grains and hardness of optical materials,while inversely proportional to granularity of abrasive grains and fracture toughness of optical materials.Moreover,the influence of the load and fracture toughness on the ratio is more significant than the granularity and hardness,respectively.The measured ratios of 80 grit and 120 grit fixed abrasive grinding of BK7 glasses are 5.8 and 5.4,respectively.

高碳化铬马氏体研磨介质在水泥联合粉磨工艺中的应饪

本文分析了高碳化铬高硬度研磨介质的研制背景，对其优良的机械性能进行了探讨，论述了在大型水泥联合粉磨系统中应用所取得的良好的技术经济效果，建议在各种水泥管磨机中推广使用，促进节能减排与低碳经济技术升级。