Sinterable powdered glasses comprising MgO, Al2O3, SiO2 and at least one modifying oxide selected from the group consisting of BaO, PbO, SrO and CaO, which are thermally-crystallizable at sintering temperatures to yield highly crystalline, low expansion, thermally stable glass-ceramic coatings compr
Sinterable powdered glasses comprising MgO, Al2O3, SiO2 and at least one modifying oxide selected from the group consisting of BaO, PbO, SrO and CaO, which are thermally-crystallizable at sintering temperatures to yield highly crystalline, low expansion, thermally stable glass-ceramic coatings comprising crystals of a structure corresponding to hexagonal cordierite as the crystal phase, are described. The use of the glasses to provide crystallized electrical barrier layers on glass-ceramic articles is also described.
대표청구항▼
A ceramic article having on at least a portion of the surface thereof a non-porous sintered cordierite glass-ceramic coating, wherein a. said coating has an oxide composition consisting essentially, in mole percent, of about 22.2-26 mole percent MgO, 23.6-27.8 mole percent Al2O3, 44.3-52.7 mole perc
A ceramic article having on at least a portion of the surface thereof a non-porous sintered cordierite glass-ceramic coating, wherein a. said coating has an oxide composition consisting essentially, in mole percent, of about 22.2-26 mole percent MgO, 23.6-27.8 mole percent Al2O3, 44.3-52.7 mole percent SiO2, 0.7-5.6 mole percent MO, wherein MO is one or more modifying oxides selected from the group consisting of BaO, PbO, SrO and CaO, and at least 23.6 mole percent total of (MO +MgO), said Al2O3 being present in an amount which exceeds the amount of said modifying oxides by about 21-23 mole percent, b. said coating contains crystals of a structure corresponding to hexagonal cordierite as the sole crystal phase, being essentially free of residual glass and the secondary crystal phases magnesia quartz, sapphirine and celsian; and c. said coating is provided by heating a glass powder coating having said oxide composition at a temperature in the range of about 900°-1050°C. for a time sufficient to obtain the sintering and crystallization thereof. a glass-ceramic article having on at least a portion of the surface thereof a nonporous, sintered cordierite glass-ceramic coating, wherein a. said coating has an oxide composition consisting essentially in mole percent, of about 22.2-26 mole percent MgO, 23.6-27.8 mole percent Al2O3, 44.3-52.7 mole percent SiO2, 0.7-5.6 mole percent MO, wherein MO is one or more modifying oxides selected from the group consisting of BaO, PbO, SrO, and CaO, and at least 23.6 mole percent total of (MO +MgO), said Al2O3 being present in an amount which exceeds the amount of said modifying oxides by about 21-23 mole percent, b. said coating contains crystals of a structure corresponding to hexagonal cordierite as the sole crystal phase, being essentially free of residual glass and the secondary crystal phases magnesia quartz, sapphirine and celsian; and c. said coating is provided by heating a glass powder coating having said oxide composition at a temperature in the range of about 900°-1050°C. for a time sufficient to obtain the sintering and crystallization thereof.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허를 인용한 특허 (18)
Shima Yoshinobu (Yokohama JPX) Kamio Hiroshi (Tokyo JPX), Apparatus for manufacturing silicon single crystals.
Kumar Ananda H. (Wappingers Falls NY) McMillan Peter W. (Warwick NY GB2) Tummala Rao R. (Wappingers Falls NY), Glass-ceramic structures and sintered multilayer substrates thereof with circuit patterns of gold, silver or copper.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.