Bone porcelain glaze 10

Calculated by the bone porcelain measuring chemical composition and the known bone porcelain glaze type raw material chemical composition and formulation, and glaze formula calculation, the calculation steps are as follows: (1) to each bone China raw material proportioning multiplied by the mass fraction of each raw material in the oxide is calculated for each oxide quality; (2) the quality of each oxide addition, calculate the amount of each oxide sum, namely chemical composition; (3) the oxide respectively divided by its molecular weight, calculate the amount of substance of each oxide. (4) the material of each oxide amount divided by the sum of the amount of alkaline oxide material; (5) the oxide, in an ordered sequence for a quick prayer glaze frit plant formula for: 27% feldspar, stalactites 12. 5%, 26% quartz, zinc oxide 2. 8%, borate 11. 5% borax. 4. 15 lead with 7%, Dan. 5%. Zinc oxide, boric acid and other chemical raw materials using industrial pure, mineral raw material chemical composition. Solution: (1) to each bone China raw material proportioning multiplied by the mass fraction of each raw material in the oxide is calculated for each oxide quality; The quality of each oxide addition, calculate the quality of each oxide combined. (2) the oxide with its molecular weight, respectively calculated for each oxide amount of substance, the amount of substance of oxide divided by the sum of the amount of alkaline oxide material, namely chemical composition. (3) the oxide, in an ordered sequence for a quick prayer bone porcelain glaze type expansion coefficient of linear expansion coefficient of bone porcelain glaze ( α ) For the body expansion coefficient ( a) A third, namely 3 & alpha; = a, body of bone porcelain glaze expansion coefficient estimation of available and law. Additivity is used to calculate the expansion coefficient of tend to the corresponding deviation with the measured values, the calculation results can only be used as a reference. Practice, in addition to the direct measurement of bone porcelain glaze expansion coefficient, still can use before, during and after the measurement of bone porcelain glazing to the change of bending strength increase and decrease of the article tries to do summary judgment. Article after glazing, for example, try bending strength is higher than the bending strength of bone porcelain body before glazing, then is & other; Is glaze & throughout; , namely glaze expansion coefficient is less than bone porcelain body expansion coefficient; The opposite is greater than the body expansion coefficient. Bone porcelain glaze billet adaptive expansion system teaching effects on bone porcelain glaze billet adaptive thermal expansion is due to the hot objects after the thermal shock in each particle, the amplitude increases with temperature rise, make the distance between the particle increases, generally characterized by the coefficient of expansion. The composition of bone porcelain glaze billet, its natural expansion. Due to bone porcelain glaze is closely linked with grey, so when the bone porcelain glaze expansion coefficient is lower than the billet, the cooling process of bone porcelain glaze than body shrink. Bone porcelain glaze besides by itself the contraction deformation still, bone by bone China porcelain billet body contraction has given its compression effect, make it produce compression elastic deformation, thus in the solidification of the glaze layer; the compression stress. Conversely, when bone porcelain glaze expansion coefficient is greater than the bone porcelain body, glaze is bone porcelain body stretching, stretching, said compression glaze or & other; Are elastic deformation, the glaze is kept in water for a long time tensile stress. Glaze with compressive stress & throughout; 。 By the same token, the tensile stress of the glaze is called & other; Negative glaze & throughout; When bone porcelain glaze billet equals the expansion coefficient, thermal stress bone porcelain glaze layer should be without water for a long time. The influence of bone porcelain glaze billet expansion coefficient. Intermediary effect on bone porcelain glaze billet adaptive bone porcelain body and glaze only when the two corresponding chemical reactions during calcining, formed in the chemical composition and organization structure between billet, glaze & other Throughout the middle transition layer &; , they would be formed for the possibility of a whole. But the middle tier can further buffer, or even eliminate the billet glaze expansion difference caused by the harmful stress; Its effect on bone porcelain glaze billet bonding strength degree research was not deep, there are also some scholars believe the bone porcelain glaze billet middle tier is not the ease or eliminate stress the role of the glaze. — Bone China life of bowl to be continued. 。 。 。 。 。