Formation of Functionally Graded Cemented Carbides by Microwave Assisted Sintering in Reactive Atmosheres
Formation of Functionally Graded Cemented Carbides by Microwave Assisted Sintering in Reactive Atmosheres
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DOI：
10.1007/978-3-540-32944-2_66
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
R. Tap;M. Willert-Porada;Klaus Rodiger;R. Klupsch
中科院分区：
文献类型：
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作者：
R. Tap;M. Willert-Porada;Klaus Rodiger;R. Klupsch
In the field of metal machining for future" dry" turning applications tools with improved wear in high speed turning operations are required. The more rapid processing of high quality materials with reduction of lubricant and cooling agents requires the development of new cutting tools, with thick coatings or graded structures, suitable for increasing the heat conductivity, the toughness as well as the adhesion between the substrate and the functionally graded structure. Recently, cutting tools of identical composition of the basic cemented carbide as well as the coating showed a significantly enhanced wear resistance, when the basic cemented carbide insert was sintered by microwaves (abbreviated as MWS) prior to coating [1]. A doubled cutting length was achieved, as shown in Figure 1. It was assumed, that sintering by microwaves influences the surface near composition of the cemented carbide in a different way as conventional sintering (abbreviated by CS) does [2]. Moreover, by application of microwave heating sintering of cemented carbides is performed in ambient pressure in different inert or reactive atmospheres [3]. In the conventional process reduced pressure is required, therefore not only the chemical activity of the components will be affected but also compositional changes due to evaporation of Cobalt will become less important upon MWS as compared to CS.
