Porcelain composition, porcelain and method of producing the same, and wiring board and method of producing the same

A porcelain comprising;

• a glass phase;
• a spinel compound crystal phase;
• and
• a non-oxide ceramic phase made of at least one selected from the group consisting of AlN, Si3N4, SiC and BN,
• wherein the porcelain has a relative density that is not less than 95% and a dielectric constant that is not more than 8, and a thermal conductivity that is not less than 2 W/m·K and
• wherein the porcelain is formed by mixing powders of 30 to 95% by weight of a borosilicate glass powder containing at least SiO2, Al2O3, ZnO and B2O3 and 5 to 70% by weight of at least one of a non-oxide ceramic filler selected from the group consisting of AlN, Si3N4, SiC and BN, forming said powders into a predetermined shape and firing, and
• said porcelain further comprising at least one of a (M1) Al2Si2O7 (M1 is at least one of Ca, Sr and Ba) crystal phase and a (M2)2MgSi2O7 (M2 is at least one of Ca, Sr and Ba) crystal phase as a second most prevalent crystal phase as measured by peak intensity using x-ray diffraction.

A porcelain comprising:

• a glass phase;
• a spinal compound crystal phase;
• and
• a non-oxide ceramic phase made of at least one selected from the group consisting of AlN, Si3N4, SiC and BN,
• wherein the porcelain has a relative density that is not less than 95% and a dielectric constant that is not more than 8, and a thermal conductivity that is not less than 2 W/m·K, and
• wherein the porcelain is formed by mixing powders of 30 to 95% by weight of a borosilicate glass including SiO2, Al2O3, ZnO and B2O3 and 5 to 70% by weight of at least one of a non-oxide ceramic filler selected from the group consisting of AlN, Si3N4, SiC and BN, forming said powders into a predetermined shape and firing.

A porcelain comprising;

• a spinel compound crystal phase,
• a non-oxide ceramic phase made of at least one selected the group consisting of AlN, Si3N4, SiC and BN, and
• at least one crystal phase selected from the group consisting of a (M1) Al2Si2O8 (M1 is at least one of Ca, Sr and Ba) crystal phase and a (M2)2MgSi2O7 (M2 is at least one of Ca, Sr and Ba) crystal phase;
• and the at least one crystal phase is a most prevalent crystal phase as measured by peak intensity using x-ray diffraction;
• wherein the porcelain has a relative density that is not less than 95% and a dielectric constant that is not more than 8, and a thermal conductivity that is not less than 2 W/m·K.