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Evaluation of Micro End-Milling Characteristics of AlN-hBN Composites Sintered by Hot-Pressing  

Baek, Si-Young (Division of Mechanical Engineering, Inha University)
Cho, Myeong-Woo (Division of Mechanical Engineering, Inha University)
Seo, Tae-Il (Department of Mechanical Engineering, Incheon University)
Publication Information
Korean Journal of Metals and Materials / v.46, no.6, 2008 , pp. 390-401 More about this Journal
Abstract
The objective of this study is to evaluate various machining characteristics of AlN-hBN machinable ceramics in micro end-milling process for its further application. First, AlN based machinable ceramics with hBN contents in the range of 10 to 20vol% were prepared by hot-pressing. Material properties of the composites, such as relative density, Vickers hardness, flexural strength, Young's modulus and fracture toughness were measured and compared. Then, micro end-milling experiments were performed to fabricate micro channels using prepared system. During the process, cutting forces, vibrations and AE signals were measured and analyzed using applied sensor system. Machined micro channel shapes and surface roughness were measured using 3D non-contact type surface profiler. From the experimental results, it can be observed that the cutting forces, vibrations and AE signal amplitudes decreased with increasing hBN contents. Also, measured surface roughness and profiles were improved with increasing hBN contents. As a result of this study, optimum machining conditions can be determined to fabricate desired products with AlN-hBN machinable ceramics based on the experimental results of this research.
Keywords
AlN-hBN ceramics; machinable ceramics; machinability evaluation; micro end-milling; micro channel machining;
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