PROCESSING AND MECHANICAL PROPERTY RELATIONS IN TUNGSTEN-CARBIDE - COBALT ALLOYS
- Author
- DAYTON, GORDON OWEN
- Physical Description
- 182 pages
- Additional Creators
- Pennsylvania State University
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- Summary
- Processing history is becoming an important aspect of the characterization of WC-Co alloys. Several milling and mixing techniques were investigated, including ball, attritor, and shaker milling, in order to determine their effects on the microstructure and mechanical properties of these materials. A novel method of binder addition in which WC powders are coated with cobalt using a cobalt chloride precursor followed by hydrogen reduction was developed and compared to more conventional milling techniques. Densification methods include vacuum sintering and vacuum hot-pressing, both of which are less common as commercial techniques. The effects of these processing variations on final composition, microstructure, hardness and transverse bend strength were developed, and advantages and limitations of these techniques are discussed.
Throughout the study, results are compared to commercially prepared alloys included in the study and to literature data for more conventional processing methods. In all cases standard commercially available starting materials were used.
In addition, a series of vacuum hot-pressed and commercially sintered alloys were used to determine the high temperature creep characteristics of these alloys. Limitations of this approach in terms of alloy homogeneity, dependence of creep parameters on microstructure, and possible mechanisms are discussed. - Other Subject(s)
- Dissertation Note
- Ph.D. The Pennsylvania State University 1982.
- Note
- Source: Dissertation Abstracts International, Volume: 43-01, Section: B, page: 2130.
- Part Of
- Dissertation Abstracts International
43-01B
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