Method for production of silica glass using sol-gel process
AssigneeSamsung Electronics Co., Ltd.
InventorJeong-Hyun Oh
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Abstract
A composition for production of silica glass using a sol-gel process is described, comprising silica particles, a dispersing agent, and a solution containing a polymerizable monomer for formation of acrylic resin and a crosslink agent dissolved in distilled water. The polymerizable monomer is n-methylol acrylamide or n-methylol methacrylamide. A method for production of silica glass is described, including the step of adding silica particles and a dispersing agent to a premix solution of the polymerizable monomer for formation of acrylic resin and the crosslink agent dissolved in distilled water.
Claims22
A method of preparing silica glass, comprising the steps of:
- preparing a premix solution comprising a monomer selected from n-methylolacrylamide and n-methylolmethacrylamide, a cross-linking agent, and water, said premix solution having a weight content of said cross-linking agent in the range of approximately 0.05 to 1%;
- dispersing silica particles and a dispersant in the premix solution to form a sol;
- removing bubbles from the sol;
- aging the sol;
- adding a polymerization initiating agent to the aged sol, placing the sol in a mold, and gelating the sol to form a gel;
- removing the gel from the mold;
- and
- drying the gel.
A method of preparing a silica glass, comprising the steps of:
- preparing a premix solution comprising a monomer selected from the group consisting of n-methylolacrylamide and n-methylolmethacrylamide, and a cross-linking agent, said premix solution having a weight content of said cross-linking agent in the range of approximately 0.05 to 1%;
- dispersing silica particles and a dispersant in the premix solution to form a sol, a ratio of a weight of said silica particles to a weight of said premix solution being in the range of 4:6 to 6:4;
- removing bubbles from the sol;
- aging the sol;
- adding a polymerization initiating agent to the aged sol and placing the sol in a mold;
- gelating the sol to form a gel;
- aging the gel;
- removing the aged gel from the mold;
- drying the removed gel;
- and
- thermally-treating the dried gel.
A method of preparing a silica glass, comprising the steps of:
- preparing a premix solution comprising a monomer selected from the group consisting of n-methylolacrylamide and n-methylolmethacrylamide, and a cross-linking agent, said premix solution having a weight content of said cross-linking agent plus said monomer in the range of approximately 2 to 21% and a weight content of said cross-linking agent in the range of approximately 0.05 to 1%;
- dispersing silica particles and a dispersant in the premix solution to form a sol, a ratio of a weight of said silica to a weight of said premix solution being in the range of 4:6 to 6:4;
- adding a plasticizer to the sol;
- removing bubbles from the sol;
- aging the sol;
- adding a polymerization initiating agent to the aged sol;
- adding a gelling agent to adjust a pH of the sol to 9 to 11 where a weight content of the monomer is less than 4%;
- placing the sol in a mold;
- gelating the sol to form a gel;
- aging the gel at room temperature;
- removing the aged gel from the mold;
- drying the aged gel at a first temperature of 20 to 50° C. and a relative humidity of 70 to 95%;
- heating the dried gel to a second temperature of 300 to 700° C. at a rate of approximately 50° C. per hour in the atmosphere;
- maintaining at said second temperature for 2 to 8 hours;
- heating the gel to a third temperature of 800 to 1,200° C. at a rate of approximately 100° C. per hour in a chlorine gas atmosphere;
- maintaining the gel at said third temperature for 1 to 8 hours;
- heating the gel to a fourth temperature of 1,100 to 1,500° C. at a rate of approximately 100° C. per hour in a helium gas atmosphere;
- and
- maintaining the gel at said fourth temperature for 1 to 8 hours.
Dependencies are inferred from the claim text.