Combustion synthesis of glass (Al2O3-CaO-X-Y) ceramic (TiB2) composites
AssigneeGuigne International, Ltd.
InventorsHu Chun Yi, Jacques Y. Guigné, John J. Moore
Life of this patent
Estimating the term…
Abstract
The present invention is directed to the preparation of in-situ formation of a series of glass-ceramic composites by the Self-propagating High temperature Synthesis (SHS) technique with advantages of processing simplicity as well as the potential of cost savings. The materials produced by the technique contain crystalline TiB2 phase and have either a pure glassy matrix or a glass matrix with partial devitrification based on the Al2O3—CaO system. The materials can potentially be used for infrared light transmission and for other high temperature applications. These materials can also be produced with relatively high porosity.
Claims21
A process of making a glass-ceramic composite comprising the steps of:
- a. providing powdered T, B2O3, Al, CaO, X and Y, where T, X and Y are different, T is selected from the group consisting of Ti, TiO2 and TiH2, X is selected from the group consisting of metal and metal oxide and Y is selected from the group consisting of metal and metal oxide;
- b. weighing the powders in the following mole ratio:
- 3TiO2, 3B2O3,10Al, αCaO, βX and γY if T is TiO2 and T, B2O3, 2Al, αCaO, βX and γY if T is selected from the group consisting of Ti and TiH2, where α, β and γ represent non-zero numbers;
- c. mixing the powders dry for adequate time in a ball mill;
- d. forming the mixed powders into a green pellet, uniaxially, to a density of about 60% theoretical;
- and
- e. igniting the pellet, whereby a reaction product having the formula 3TiB2-5Al2O3-αCaO-βX-γY is produced if T is TiO2 and a reaction product having the formula TiB2-Al2O3-αCaO-βX-γY is produced if T is selected from the group consisting of Ti and TiH2.
A process of making a glass-ceramic composite comprising the steps of:
- a. providing powdered TiO2, B2O3, Al and CaO;
- b. weighing the powders in the following mole ratio:
- 3TiO2, 3B2O3, 10Al, αCaO where α represents a non-zero number;
- c. mixing the powders dry for adequate time in a ball mill;
- d. forming the mixed powders into a green pellet, uniaxially, to a density of about 60% theoretical;
- and
- e. igniting the pellet, whereby a reaction product having the formula 3TiB2-5Al2O3-αCaO is produced.
A process of making a glass-ceramic composite comprising the steps of:
- a. providing powdered TiO2, B2O3, Al, CaO and X, where X is selected from the group consisting of any metal and any metal oxide except TiO2;
- b. weighing the powders in the following mole ratio:
- 3TiO2, 3B2O3, 10Al, αCaO, βX, where α and β represent non-zero numbers;
- c. mixing the powders dry for adequate time in a ball mill;
- d. forming the mixed powders into a green pellet, uniaxially, to a density of about 60% theoretical;
- and
- e. igniting the pellet, whereby a reaction product having the formula 3TiB2-5Al2O3-αCaO-βX is produced.
Dependencies are inferred from the claim text.