Bone porcelain glaze 05

( 3) BaO barium features similar to lead, barium glaze have higher refractive index, can increase the bone porcelain glaze gloss, the elastic and mechanical strength of bone porcelain glaze can produce beneficial effect. In the process of firing, can reduce the influence of atmosphere of bone porcelain glaze. Although smaller than lead toxicity, but barium compounds are also toxic, use less as far as possible in use. In production, the barium carbonate directly in the clinker, usage is generally not more than 6%. Bone porcelain ceramic fritted glaze in a number of types of bone porcelain glaze, such as bone China products after a predetermined system firing, in order to get the ideal appearance quality, and to ensure that the bone has been firing porcelain body shape change, no longer be using frit, frit is most used in industry is below 1150 ℃ glaze indispensable component. For clinker, can introduce more flux of bone porcelain glaze, through advance melted, can achieve the appearance of the ideal performance. Bone porcelain bone porcelain fritted glaze is before the glaze slurry preparation will be part of the raw material of fused glass material, quick release of cold water quench hardening into small pieces, Frit) And then with other raw materials mixing system osteogenesis porcelain slurries. Fritted glaze, the main features are: strong bone porcelain glaze gloss, good elasticity, suitable for a variety of bone porcelain body, such as bone China ( Bone China) Characterize, feldspathic billet, high silica, hard clay, etc. The main reason for the production of clinker is as follows. First, some bone China toxic raw materials, human exposure of the danger. Lead compounds, for example, it does not dissolve in water, but the composition of glaze will be dissolved, in case of weak acid solution is absorbed, accumulate in the human body will lead to some degree. So, only mixed in the frit that lead compounds, can reduce the harm. Bone China second, soluble substances will join the bone porcelain glaze some or all of the soluble in water. Glazing dry billet porous, water imbibition. After glazing, bone porcelain slurries are easily dissolved substances in the water absorbed by implements body together, these strong low-temperature flux will make implements body melting softening deformation as early as possible. And stay on the surface of the bone porcelain glaze have lost part of the material, which make the bone porcelain glaze is difficult to forecast the temperature in the burnt together with the body. Methods for preparation of ceramic frit is to various materials according to the formula ratio accurately weighing, after mixing, and then placed in a crucible furnace, rotary kiln or pool, with 1250 ~ 1450 ℃ high temperature smelting, to the whole melting ( Drawn filaments no nodules) , then pour ( Drip or) Cold water quenching, make it become the crunchy small pieces, or use roll rolling piece for the pieces. In the preparation of bone to put raw material to make porcelain glaze frit, the bone China thus has the fritted glaze with supplied materials directly into glaze, greatly reduce the toxicity. Bone ceramic fritted glaze porcelain basically overcomes the drawback of the raw glaze, it is easy to control product quality, wide firing the advantage such as less affected by temperature changes, especially the vitrification performance is good and will not produce pinhole, bone China product quality is stable, and the bone porcelain glaze raw glaze relatively more exquisite and elegant. However the frit because much of clinker process and make the cost is greatly increased. Bone porcelain glaze firing temperature is generally lower than biscuit firing temperature 100 ~ 150 ℃, shandong zibo production areas of the glaze firing temperature is 1120 ~ 1170 ℃, commonly hebei tangshan region is 1050 ~ 1100 ℃, the UK is 1060 ~ 1120 ℃ are the oxidizing atmosphere. — Tangshan bone plate to be continued. 。 。 。 。 。