Glass ceramic composition

A glass ceramic composition which consists essentially of, as represented by mass percentage, from 10 to 58% of an inorganic material powder having a melting point or a glass transition point of at least 1,000° C. and from 42 to 90% of a glass powder having a glass transition point of from 450 to 800° C., wherein the glass powder consists essentially of, as represented by mol % based on the following oxides, SiO2:

• 60 to 70%, B2O3:
• 20 to 30%, Al2O3:
• 3 to 8%, MgO:
• 0 to 1%, CaO:
• 2 to 8%, BaO:
• 0 to 2% and ZnO:
• 0 to 2%, and SiO2+B2O3 is from 86 to 93%, and SiO2+B2O3+Al2O3+CaO exceeds 98%.

A glass ceramic composition which consists essentially of, as represented by mass percentage, from 10 to 58% of an inorganic material powder having a melting point or a glass transition point of at least 1,000° C. and from 42 to 90% of a glass powder having a glass transition point of from 450 to 800° C., wherein the glass powder consists essentially of, as represented by mol % based on the following oxides, SiO2:

• 35 to 53%, B2O3:
• 0 to 2%, Al2O3:
• 5 to 18%, MgO:
• 20 to 40%, CaO:
• over 7 to 19%, BaO:
• 0 to 3% and ZnO:
• 0 to 9%, and SiO2+Al2O3 is at most 59%, and Al2O3/(MgO+CaO) is at least 0.13.

A glass ceramic composition which consists essentially of, as represented by mass percentage, from 10 to 58% of an inorganic material powder having a melting point or a glass transition point of at least 1,000° C. and from 42 to 90% of a glass powder having a glass transition point of from 450 to 800° C., wherein the glass powder consists essentially of, as represented by mol % based on the following oxides, SiO2:

• 48 to 60%, B2O3:
• 2 to 10%, Al2O3:
• 5 to 18%, MgO:
• 15 to 40%, CaO:
• 0.5 to 7%, BaO:
• 0 to 3% and ZnO:
• 0.5 to 9%.

A glass ceramic composition which consists essentially of, as represented by mass percentage, from 10 to 58% of an inorganic material powder having a melting point or a glass transition point of at least 1,000° C. and from 42 to 90% of a glass powder having a glass transition point of from 450 to 800° C., wherein the glass powder consists essentially of, as represented by mol % based on the following oxides, SiO2:

• 48 to 60%, B2O3:
• 0 to 10%, Al2O3:
• 9 to 18%, MgO:
• 0 to 5%, CaO:
• 0 to 5%, BaO:
• 25 to 35%, and ZnO:
• 0 to 5%.

A glass ceramic composition which consists essentially of, as represented by mass percentage, from 10 to 58% of an inorganic material powder having a melting point or a glass transition point of at least 1,000° C. and from 42 to 90% of a glass powder having a glass transition point of from 450 to 800° C., wherein

• the glass powder consists essentially of, as represented by mol % based on the following oxides, SiO2:
• 35 to 70%, B2O3:
• 0 to 30%, Al2O3:
• 3 to 18%, MgO:
• 0 to 40%, CaO:
• 0 to 19%, BaO:
• 0 to 35% and ZnO:
• 0 to 9%;
• and
• the ratio D90/D10 of the 90% particle diameter D90 to the 10% particle diameter D10 of the above inorganic material powder is at most 5.

A glass ceramic composition which consists essentially of, as represented by mass percentage, from 10 to 58% of an inorganic material powder having a melting point or a glass transition point of at least 1,000° C. and from 42 to 90% of a glass powder having a glass transition point of from 450 to 800° C., wherein

• the glass powder consists essentially of, as represented by mol % based on the following oxides, SiO2:
• 35 to 70%, B2O3:
• 0 to 30%, Al2O3:
• 3 to 18%, MgO:
• 0 to 40%, CaO:
• 0 to 19%, BaO:
• 0 to 35% and ZnO:
• 0 to 9%;
• and
• the average of the major axes L of particles of the above inorganic material powder is from 0.5 to 15 μm, and the average of the ratios L/W of the major axes L to the minor axes W is at most 1.4.