Abstract
A study has been made of the conditions for vacuum hot-pressing of a mixture of magnesium oxide plus 2 w/o lithium fluoride for the production of transparent ceramics. The results have been used in formulating a design criteria for a continuous vacuum hot-press for the production of rods of transparent material. Single pellet hot-pressing results have shown that although transparent magnesia can be produced over a wide range of temperatures and pressures, the optimum conditions are 1000°C, 1000 psi held for 10 min under high vacuum. When these conditions are applied to ‘continuous’ production, the resultant rod is translucent with regions of transparency. The design of the continuous hot-press has successfully incorporated the use of silicon nitride as a die and die-set material.
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