MACHINING HIGH PURITY ALUMINA.
Quarterly rept. no. 2, 1 Oct-31 Dec 64,
LINDEN LABS INC STATE COLLEGE PA
Pagination or Media Count:
Material A-96 selected for the machining demonstration can be drilled, ground, threaded, slotted, tapped and turned. The material can be readily removed by either a grinding wheel or a single point cutting tool. Care must be exercised when using a single point cutting tool with regard to feeds, speeds, tool geometry, and cutting angles. The chemistry behind the acid treating and the reconstitution are not fully understood. The material A-96 treated alumina appears to be able to be reconstituted to a dense body of higher purity than the original body. Hydrofluoric acid seems to attack most bodies more readily than hydrochloric acid and 52 aqueous HF seems to attack more readily than 70 aqueous HF. There appears to be some optimum per cent aqueous acid between 70 and 40. Author