Production of Readily Compressible Dies for the Enhanced Sintering of Solids (PRESS) Preliminary Investigations
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Non-oxide ceramics, which consist of predominantly carbides, borides, and nitrides, are of great interest to modern engineering because of their resistance to extreme conditions. Properties of such materials include high temperature resistance, high hardness, chemical resistance, and high fracture toughness. However, the main method for manufacturing parts of these materials is by machining cylindrical billets to the desired geometry. Not only does this produce waste, but the cost of machining is high since the part materials are of such high hardness. This method is used because these non-oxide ceramics must be sintered to high density using simultaneous heat and pressure within a hot-pressing unit. These units are inherently restricted to cylindrical geometries. A proposed way to expand the capabilities of a hot-press is by using intermediate compressible dies. This method consists of surrounding a ceramic part green body with a material that will shrink at the same rate as the part and survive the hot-pressing conditions. At the end, the compressible die material would be removed leaving a nearly net shaped hot-pressed part. In this study, graphite powder was investigated as the compressible die material with its shrinkage rate being controlled by particle size mixing. Both ceramic materials and graphite were then cast into parts and compressible dies respectively to show the feasibility of the compressible die hot-pressing method.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- AC52-07NA27344
- OSTI ID:
- 2449706
- Report Number(s):
- LLNL--TR-869785; 1106197
- Country of Publication:
- United States
- Language:
- English
Similar Records
HOT-PRESSING CERAMICS IN ALUMINA DIES
RESISTANCE HOT PRESSING
DEVELOPMENT OF DIES FOR EXTRUSION OF COMPLEX SHAPES OF STEEL AND REFRACTORY ALLOYS. Interim Progress Report, January 1-March 31, 1963
Journal Article
·
Sun Sep 01 00:00:00 EDT 1963
· American Ceramic Society Bulletin (U.S.)
·
OSTI ID:4634916
RESISTANCE HOT PRESSING
Technical Report
·
Sat Aug 01 00:00:00 EDT 1959
·
OSTI ID:4210683
DEVELOPMENT OF DIES FOR EXTRUSION OF COMPLEX SHAPES OF STEEL AND REFRACTORY ALLOYS. Interim Progress Report, January 1-March 31, 1963
Technical Report
·
Wed May 01 00:00:00 EDT 1963
·
OSTI ID:4687103