Grinding induced damage in ceramics
Grinding induced damage in ceramics
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DOI：
10.1016/s0924-0136(02)00952-4
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发表时间：
2003-01-10
影响因子：
6.3
通讯作者：
Yoshikawa, M
中科院分区：
文献类型：
--
作者：
Zhang, B;Zheng, XL;Yoshikawa, M
磨削加工作为一种加工陶瓷零件的生产技术在制造业中被广泛应用，但它经常对加工后的零件造成损伤。然而，磨削损伤的确切性质、方式和穿透深度仍然不清楚，这给陶瓷结构应用留下了许多不确定性，有时甚至是危险的。本文介绍了金刚石磨削高级陶瓷的研究成果，包括热压氮化硅、热压氧化铝、滑铸氧化锆和无压烧结碳化硅。采用三种破坏性检测技术和逐级研磨技术，结合扫描电子显微镜（SEM）和透射电子显微镜（TEM），对这些陶瓷的磨削损伤进行了评估和表征。结果表明，磨削损伤主要有两种类型：磨粉损伤和微裂纹损伤。损伤深度与陶瓷材料的性能，尤其是脆性有关。在给定的磨削条件下，脆性较弱的材料比脆性较强的材料损伤穿透更深。此外，还发现了两种类型的磨致微裂纹：分散型和聚集型。前者在各种磨削条件下测试的所有四种类型的材料上都可以观察到，而后者只与经受相对剧烈磨削条件的脆性较低的材料有关。讨论了损伤成核和扩展的机理。研究结果为研究磨削损伤与工件材料性能和砂轮粒度的关系提供了有价值的见解。(C) 2002 Elsevier Science B.V.版权所有
Although grinding is widely used as a productive technique for finishing ceramic components in the manufacturing industry, it often causes damage to the machined components. The exact nature, the manner and the penetration depth of grinding-induced damage are, however, still not clear, leaving many uncertainties and sometimes danger in using ceramics for structural applications. This paper presents research results on diamond grinding of advanced ceramics, including hot-pressed silicon nitride, hot-pressed alumina, slip-cast zirconia, and pressureless sintered silicon carbide. Grinding induced damage in these ceramics is assessed and characterized using three destructive inspection techniques and progressive lapping technique combined with scanning electron microscopy (SEM), and transmission electron microscopy (TEM). As a result, two types of grinding damage are identified, pulverization and microcracking. Damage depth is found to be related to the properties of ceramic materials, especially their brittleness. For a given grinding condition, damage penetrates deeper in less brittle materials than in more brittle materials. In addition, two types of grinding-induced microcracks are identified, scattered and clustered. The former is observed on all four types of materials tested under various grinding conditions, While the latter is only associated with less brittle materials subjected to relatively aggressive grinding conditions. The mechanisms of damage nucleation and propagation are discussed. The results provide valuable insights into the dependence of grinding-induced damage on the properties of workpiece materials, and on the grit size of grinding wheels. (C) 2002 Elsevier Science B.V. All rights reserved.