Non-Metallic Tooling for High Temperature Applications
Final technical engineering rept. 5 Jun 1958-31 Dec 1960
LOCKHEED AIRCRAFT CORP MARIETTA GA
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Commercial castable refractory ceramics can now be economically fabricated into tools for hydroform blocks, draw dies, braze and heat treatment fixtures, stress relief fixtures, and stretchform dies that will withstand operating temperatures in the 1500 - 2000 F range for use in fabrication of the newer high-temperature alloys. Many of the newer high strength - high temperature alloys require hot forming and thermal treatment tooling capable of operation at temperatures up to 2000 F, above the usefulness of plastics, kirksite, lead, etc. While hard metallic tooling such as meehanite and high nickel alloys which require machining to final dimensions, might suffice, it was felt that cast to dimension ceramic tooling would be more economical. A world wide search for potential formulations was made, resulting in the evaluation of 153 ceramic compositions. Of these, 9 have been found satisfactory for the high temperature tooling applications. Laboratory and production size tooling have been proven for up to 2000 F hydroforming and stretchforming, stress relieving, heat treating, and brazing.
- Machinery and Tools