| Patent Number |
Title Of Patent |
Date Issued |
| 5695725 |
Method of preparing monoclinic BaO.A1.sub.2 O.sub.3.2SiO.sub.2 |
December 9, 1997 |
| Monoclinic celsian (BaO.Al.sub.2 O.sub.3.2SiO.sub.2) is produced by heating a stoichiometric, powder mixture of BaCO.sub.3 (or BaC.sub.2 O.sub.4), Al.sub.2 O.sub.3, and SiO.sub.2 (preferably SiO.sub.2 gel) with monoclinic celsian seeds at from 1250.degree. C. to 1500.degree. C. |
| 5642868 |
Ceramic material |
July 1, 1997 |
| A ceramic material which is (1) ceramics based on monoclinic BaO.multidot.sub.2 O.sub.3 .multidot.2SiO.sub.2 ; (2) ceramics based on monoclinic SrO.multidot.Al.sub.2 O.sub.3 .multidot.2SiO.sub.2 ; or (3) ceramics based on monoclinic solid solution of BaO.multidot.Al.sub.2 O.sub.3 .m |
| 5641440 |
Sintering aids for producing BaO.Al.sub.2 O.sub.3.2SiO.sub.2 and SrO.Al.sub. O.sub.3.2SiO.sub.2 |
June 24, 1997 |
| A glass which contains (1) an alkaline earth oxide that is BaO, SrO, or mures thereof, (2) Al.sub.2 O.sub.3, and (3) SiO.sub.2. The glass is useful as a sintering aid in the preparation of monoclinic BaO.Al.sub.2 O.sub.3.2SiO.sub.2 or monoclinic SrO.Al.sub.2 O.sub.3.2SiO.sub.2 ceramic |
| 5604165 |
CrB.sub.2 -NbB.sub.2 /Al.sub.2 0.sub.3 and CrB.sub.2 -NbB.sub.2 /SiC ceramic composite materials |
February 18, 1997 |
| A composite with a reinforcing material that is Al.sub.2 O.sub.3, SiC, or xtures thereof in a matrix that is a ceramic material based on a solid solution of CrB.sub.2 and NbB.sub.2. |
| 5578534 |
Method of producing Sl.sub.3 N.sub.4 reinforced monoclinic BaO.multidot.Al.sub.2 O.sub.3 .multid |
November 26, 1996 |
| A Si.sub.3 N.sub.4 reinforced aluminosilicate ceramic composite made ofA. from about 5 to about 40 weight percent of Si.sub.3 N.sub.4 reinforcem material;B. from about 15 to about 35 weight percent of the recrystalization products formed from a molten glass composed of(1) from about 8 to ab |
| 5573986 |
Electromagnetic window |
November 12, 1996 |
| A ceramic electromagnetic window made of Si.sub.3 N.sub.4 particles which are bonded together by a metal phosphate binder that is an AlPO.sub.4 binder, a ZrP.sub.2 O.sub.7 binder, or mixtures thereof, wherein the Si.sub.3 N.sub.4 particles comprise from 55 to 85 volume percent of the |
| 5571759 |
CrB.sub.2 -NbB.sub.2 ceramics materials |
November 5, 1996 |
| Ceramic materials based on solid solutions of chromium diboride (CrB.sub.2) nd niobium diboride (NbB.sub.2). |
| 5538925 |
Si.sub.3 N.sub.4 reinforced monoclinic BaO.Al.sub.2 O.sub.3 .circle-solid.2S.sub.2 and SrO.Al.su |
July 23, 1996 |
| A Si.sub.3 N.sub.4 reinforced aluminosilicate ceramic composite made ofA. from about 5 to about 40 weight percent of Si.sub.3 N.sub.4 reinforcem material;B. from about 15 to about 35 weight percent of the recrystalization products formed from a molten glass composed of(1) from about 8 to ab |
| 5538925 |
Si.sub.3 N.sub.4 reinforced monoclinic BaO.Al.sub.2 O.sub.3 .circle-solid.2S.sub.2 and SrO.Al.su |
July 23, 1996 |
| A Si.sub.3 N.sub.4 reinforced aluminosilicate ceramic composite made ofA. from about 5 to about 40 weight percent of Si.sub.3 N.sub.4 reinforcem material;B. from about 15 to about 35 weight percent of the recrystalization products formed from a molten glass composed of(1) from about 8 to ab |
| 5521132 |
Ash-based ceramic materials |
May 28, 1996 |
| A ceramic material made from raw coal fly ash or raw municipal solid waste fly ash and (1) sodium tetraborate or (2) a mixture of sodium tetraborate and a calcium containing material that is triple superphosphate, lime, dolomitic lime, or mixtures thereof. |
| 5047387 |
Method for the selecting superconducting powders |
September 10, 1991 |
| There is disclosed herein an invention for beneficiation of powered material having superconducting characteristics and processes for carrying it out. The invention involves introducing powdered superconducting material into the vertical field of a magnet wherein particles thereof are |
| 5041400 |
Low temperature synthesis of high purity monoclinic celsian |
August 20, 1991 |
| A process for preparing monoclinic celsian from AlF.sub.3, Al.sub.2 O.sub.3, BaCO.sub.3, and fused SiO.sub.2 powders by heating an intimate mixture of the powders (1) at from about 700.degree. to 900.degree. C. to form topaz and then (2) at a temperature as low as 900.degree. C. to p |
| 4994419 |
Low temperature synthesis of high purity monoclinic celsian using topaz |
February 19, 1991 |
| A process for preparing monoclinic celsian from topaz and BaCO.sub.3, pows by heating an intimate mixture of the powders at a temperature of from 900.degree. C. to less than 1590.degree. C. in an atmosphere of the gases generated by the monoclinic celsian formation reaction itself. |
| 4948766 |
Rigid mullite=whisker felt and method of preparation |
August 14, 1990 |
| A process in which (1) AlF.sub.3 and SiO.sub.2 or AlF.sub.3, SiO.sub.2, and Al.sub.2 O.sub.3 powders are formed into a green body of a desired shape and size; (2) the green body is heated at 700.degree. C. to 950.degree. C. in an anhydrous SiF.sub.4 atmosphere to form barlike topaz cryst |
| 4911902 |
Mullite whisker preparation |
March 27, 1990 |
| A process for preparing mullite, 3Al.sub.2 O.sub.3.2SiO.sub.2, whiskers by(1) forming an intimate, anhydrous mixture of AlF.sub.3 and SiO.sub.2 powders in about a 12:13 molar ratio;(2) heating the mixture in an anhydrous, SiF.sub.4 atmosphere at about 700.degree. C. to about 950.degree. C. t |
| 4910172 |
Preparation of mullite whiskers from AlF.sub.3, SiO.sub.2, and Al.sub.2 O.sub.3 powders |
March 20, 1990 |
| A process for preparing mullite whiskers by(1) forming an anhydrous, intimate, uniform mixture of AlF.sub.3, Al.sub.2 O.sub.3, and fused SiO.sub.2 powders in an amount selected to produce stoichiometric mullite or a solid solution of Al.sub.2 O.sub.3 in stoichiometric mullite;(2) heating |
