期刊
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
卷 38, 期 6, 页码 473-480出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mawe.200700153
关键词
diamond composite diamond impregnated tools; encapsulation; hot isostatic pressing; PVD-process
For machining of mineral materials diamond tools consisting of a steel body combined with diamond impregnated segments are used. Frequently, these segments are hot pressed. Other process routes are pressureless sintering of green compacts partly combined with hot isostatic pressing and hot isostatic pressing of encapsulated powder mixtures. The compaction effect of hot isostatic pressing require a low porosity of sintered components realized by using ultra-fine metal powder or an impermeable capsule made of metal or glass. The Institute of Materials Engineering pursues a novel process route by physical vapor deposition of a coating on pressureless sintered composites. The thin coating acts as a capsule and guarantees the pressure transfer in the following hot isostatic pressing process. Although bronze powders with particle sizes up to 90 mu m are used, the manufacturing of diamond composites with low porosities is possible. In comparison to conventional encapsulation-techniques the main advantages of this novel process route are the use of comparatively coarse metal powders and a larger geometric flexibility.
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