EFFICIENCY IN LAPPING FERRITE

The present work has studied the effect of various parameters on the efficiency when lap-ping Mn-Zn ferrite material with fine diamond grains. The main factors affecting the efficiencywere made clear and the optimum lapping condition was discussed. It was found that the efficiencycan be affected greatly by the parameters in terms of the number of active grains per time. while thesurface roughness finally obtained is generally almost the same for a given grain size.

EFFECT OF LAP SURFACE PROFILE ON LAPPING EFFICIENCY

To meet the requirements of improving the efficiency in lapping operat ion, the effect of lap surface profile on the efficiency is analyzed theoretical ly and an experimental study is carried out on lapping of Mn Zn ferrite. It is f ound that the profile of lap surface affects significantly the efficiency by mea ns of its capacity to keep loose grains and fixed grains during lapping, and tha t the efficiency can be increased by several times by using a lap with proper surface profile, while the same work surface roughness can be finally obtained.

不同材质磨盘对蓝宝石晶片研磨性能的影响

从实际生产加工的角度,研究磨盘材质和研磨磨料对蓝宝石晶片加工效果的影响。以实际生产工艺进行实验,比较铸铁磨盘、陶瓷复合盘、树脂铜盘和聚氨酯研磨布在使用B4C或金刚石研磨液时的加工效果、成品率和研磨效率。结果显示:经聚氨酯研磨布研磨的蓝宝石晶片,其表面质量最好,为Ra0.058μm;陶瓷复合盘的研磨效率最高,达到0.305μm/min,且成品率可保持在96.08%。如粗糙度要求较高(Ra≤0.06μm),则建议使用聚氨酯研磨布搭配金刚石研磨液;如果更强调成本和效率(粗糙度要求Ra≤0.08μm),建议使用陶瓷复合盘搭配B_4C研磨液。

LED用SiC衬底的超精密研磨技术现状与发展趋势

介简单地介绍了发光二极管的发展历程,概述了LED用SiC衬底的超精密研磨技术的最新现状及发展趋势,阐述了研磨技术的原理、应用和优势。同时结合实验室X61 930B2M-6型研磨机,分析了加工工艺参数对研磨表面质量的影响,介绍了当前SiC衬底加工达到的精度水平,即SiC衬底表面粗糙度小于50nm,平面度和翘曲度均小于5,并提出了研磨加工将会向高精度、高效率的方向发展。SiC作为外延的最佳衬底,必将成为研究热点,未来SiC会向大尺寸、更低缺陷水平方向发展。

铁氧体陶瓷高效磨削技术研究

通过试验研究了不同磨削参数对铁氧体的表面粗糙度、磨削力、磨削效率的影响规律,并在此基础上探讨了铁氧体的高效磨削技术。