초록 ▼

This invention is directed to lead-free and, where desired, cadmium-free frits for glazes and enamels, said frits consisting essentially, in mole percent on the oxide basis, of ________________________________ -SiO2 55-75 Na2O 3-9 B2O3 8-13 ZrO2 2-5 Al2O3 0.5-3 BaO 0.5-16 ___________________________

This invention is directed to lead-free and, where desired, cadmium-free frits for glazes and enamels, said frits consisting essentially, in mole percent on the oxide basis, of ________________________________ -SiO2 55-75 Na2O 3-9 B2O3 8-13 ZrO2 2-5 Al2O3 0.5-3 BaO 0.5-16 ________________________________ Various inert refractory materials may be included as fillers.

대표청구항 ▼

A frit essentially free of lead demonstrating good glass stability, a linear coefficient of thermal expansion (25°-300°C.) between about 45-90×10-7/°C., a viscosity suitable for firing between about 800°-900°C., a softening point between 640°-800°C., and excellent resistance to attack by acids and b

A frit essentially free of lead demonstrating good glass stability, a linear coefficient of thermal expansion (25°-300°C.) between about 45-90×10-7/°C., a viscosity suitable for firing between about 800°-900°C., a softening point between 640°-800°C., and excellent resistance to attack by acids and bases, as evidenced by essentially no visual change in appearance after an exposure of 16 hours at room temperature to a 5% by weight aqueous solution of acetic acid, to a 5% by weight aqueous solution of H2SO4, and a 5% by weight, aqueous solution of NaOH, said frit consisting essentially, expressed in terms of mole percent on the oxide basis, of ________________________________ -SiO2 60-75 Na2O 5-8 B2O3 9-13 ZrO2 2.5-4.5 Al2O3 1-2 BaO 1-16. ________________________________ A frit essentially free of lead demonstrating good glass stability, a linear coefficient of thermal expansion (25°-300°C.) between about 45-90×10-7/°C., a viscosity suitable for firing between about 800°-900°C., a softening point between 640°-800°C., and excellent resistance to attack by acids and bases, as evidenced by essentially no visual change in appearance after an exposure of 16 hours at room temperature to a 5% by weight aqueous solution of acetic acid, to a 5% by weight aqueous solution of H2SO4, and a 5% by weight aqueous solution of NaOH, said frit consisting essentially, expressed in terms of mole percent on the oxide basis, of ________________________________ -SiO2 58-65 Na2O 5-7 B2O3 10-12 ZrO2 2-3.5 Al2O3 1-2 BaO 6-15 Li2O 4-8 K2O 3-5. ________________________________