Fabrication of phosphate-bonded mica ceramics by hot isostatic processing

Abstract

In the previous paper [1], we reported on hot isostatic pressing of nonadditive mica ceramics using a Roy—Tuttle-type pressure vessel. Powder compacts of nonadditive fluorphlogopite encapsulated in a borosilicate glass tube were isostatically hot-pressed at a selected temperature between 600 and 800° C under 49 to 98MPa of water. Consequently synthetic mica without any additives was able to be sintered to a density of 2.60 g cm−3 (91.2% of theoretical density) with no grain growth under 98 MPa at 800° C for 45 min.