PROCESS AND ARTICLE COMPRISING A LAYER OF A TERNARY COMPOSITION OF HAFNIA; ZIRCONIA AND TITANIA BONDED TO A SILICA SUBSTRATE

摘要

An article of manufacture consisting of a high thermal shock resistant composite, said composite formed of a first layer of a composition of low expansion particulate oxide layer intimately bonded to a second layer of a low expansion preformed silica material. The particulate oxide layer consists essentially of 60 to 85 mole percent hafnia, 10 to 30 mole percent zirconia and 10 to 30 mole percent titania.