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Ceramics For Difficult Materials
Release date:2012/10/16      Browsing times:1116Time      Keyword:本站

 

Development efforts in ceramic tool technology are enabling these hightech tools to move into new areas of application. While recently developed silicon nitride tools offer improved fracture resistance compared to their predecessors, their relatively low resistance to chemical wear has limited their use in the machining of nodular cast irons (Figure 7, below). However, wearresistant CVD alumina coatings have expanded the application range of siliconnitridebased tools to include these difficult tomachine irons.

Regarding alumina (A1203based) ceramics, the addition of silicon carbide whiskers offers increased productivity in the machining of Inconel and similar highstrength, hightemperature alloys in the aerospace industry. Singlecrystal whiskers deflect cracks in the alumina matrix and thereby improve fracture toughness of the tool.

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