Bone porcelain glaze 02

( 7) According to the main solvents or basic component types are classified to show the flux or alkaline ( Including alkali and alkali metal oxide) Composition of bone porcelain glaze melts and character, the influence of European habits lead to low temperature glaze classified as the center, Japan and our country's raw glaze over lime glaze. Bone China, therefore, as a kind of bone porcelain glaze, due to the different classification methods can also has several names. For the average bone China ( Bone China) For classification according to the preparation method of the glaze, the bone porcelain glaze can be divided into raw glaze and fritted glaze. For the majority of bone China, Bone China) Speaking, generally use the fritted glaze. Raw bone porcelain bone porcelain glaze is to point to directly from the raw material preparation of glaze, all raw materials are used without melted in advance, add water to create plasma directly. These materials is largely insoluble in water, can be stored for a long time. Bone porcelain bone porcelain fritted glaze is first part or all of the materials will be melt into insoluble in water frit or poorly soluble in water of frit glaze slurry process using again. Before the bone porcelain glaze in pulp will be part of the raw material of fused glass material and water into small pieces, Frit) , then mix with the rest of the raw materials developed osteogenesis porcelain slurries. Through a system of clinker can be flux of sodium carbonate, potassium carbonate, boric acid, borax and other soluble materials, as well as low toxic materials such as lead, barium into soluble silicate and low toxicity or no toxicity, prevent the glazing workers poisoning and flux absorbed by bone porcelain blank, from the surface of expanded bone porcelain glaze with the kinds of raw material, and preclude the part of the decomposition of volatile gas in the raw materials, reduce the probability of bone porcelain firing foaming products such as the opacifying agent, color agent into the clinker consumption of auxiliary materials such as fluxing agent, can not only overcome it happens in axoplasmic layered faults, but also to strengthen the material dispersion and recrystallization in glaze layer. The nature of the bone porcelain bone porcelain glaze ( 1) Bone porcelain glaze chemical stability bone porcelain glaze is a kind of vitreous body, bone China, Bone China) Glaze is borosilicate glass, its chemical stability depends on its degree of network structure, especially the silicon oxygen tetrahedron connected degree, caused the SiO other ions embedded bond rupture of the more complete network structure, namely, the greater the degree of connection, the higher the strength. Due to containing alkali metal oxide in the bone porcelain glaze, the alkali metals and alkaline earth metal cations embedded oxygen-silicon tetrahedron network structure, make the si-o bond rupture, and reduces the glass the ability of resistance to chemical attack. This role as a price or bivalent ion radius increases. For alkali metal glass, generated by hydrolysis of hydroxyl compounds has larger water soluble, hydrolysis rate, seriously affect the glass chemical stability. For alkaline earth metal oxide glass, generated by the hydrolysis of water-soluble polyol with smaller, so the hydrolysis rate of small, relatively higher chemical stability. These phenomena and bone porcelain glaze chemical stability are consistent. Bone China ( 2) Bone porcelain glaze melting performance without fixed melting point, just within the scope of melting gradually. Made 2 mm bone porcelain glaze & times; 3 mm small cylinder, when it is heated to the temperature of the edges and corners when it become known as the beginning of melting temperature, softening to and bone China chassis plane form semicircle spherical as the temperature of melting temperature. Mature bone porcelain glaze temperature is higher than the beginning of melting temperature, but not both. Bone China & ndash; Tangshan bone porcelain cup dish to be continued. 。 。 。 。 。