Bone china paste and preparing technology thereof

Abstract

The invention discloses a bone china paste and a preparing technology thereof. The bone china paste comprises the following components by weight percent: 34.0-38.0% of SiO2, 12.0-16.0% of Al2O3, 0.2-0.4% of Fe2O3, 0.05-0.2% of TiO2, 24.5-27.0% of CaO, 0.5-1.5% of MgO, 18.0-21.0% of P2O5 and 0-4.0% of K2O and Na2O2, wherein the sum of the weight percent of the compounds is 100%. Ball clay is introduced in the bone china paste to increase the plasticity of the paste; and synthetic bone char is used to replace natural bone char, thus the dependence of the mass production of the bone china paste to natural bone char can be lowered and the paste can have reasonable chemical composition and better physical performance indexes; and the formability of paste can be improved, the production technology difficulty of bone china can be reduced, the qualification rate of products can be greatly increased, and technical supports can be provided for the batch production of bone china.

Description

technical field [0001] The invention belongs to the technical field of ceramic glazes, and in particular relates to a bone china blank that can be used in the field of high-grade daily-use ceramics and a preparation process for the bone china blank. Background technique [0002] Bone China was invented in England in the 18th century. Because of its high whiteness, good light transmittance, and soft tones, it is loved by people all over the world. It is currently recognized as a high-end daily-use ceramic in the world. Bone ash is the main raw material, adding a certain amount of feldspar, quartz and clay and other raw materials. The dosage range of each component is bone ash (30-60)%Wt, feldspar (8-22)%Wt, quartz (9-20%) )%Wt, clay (25-45)%Wt, the production process is basically the same, all using two firing processes, that is, high-temperature biscuit firing (1200-1270°C), low-temperature glaze firing (1050-1150°C) process, However, for a long time, the production and pro...

AI Technical Summary

Problems solved by technology

[0002] Bone China was invented in England in the 18th century. Because of its high whiteness, good light transmittance, and soft tones, it is loved by people all over the world. It is currently recognized as a high-end daily-use ceramic in the world. Bone ash is the main raw material, adding a certain amount of feldspar, quartz and clay and other raw materials. The dosage range of each component is bone ash (30-60)%Wt, feldspar (8-22)%Wt, quartz (9-20%) )%Wt, clay (25-45)%Wt, the production process is basically the same, all using two firing processes, that is, high-temperature biscuit firing (1200-1270°C), low-temperature glaze firing (1050-1150°C) process, However, for a long time, the production and promotion of traditional bone china in the world has been affected by the following factors: (1) lack of bone source, high price, natural bone carbon itself is alkaline, and oxalic acid should be added to neutralize it during use, resulting in production The cost is high and the production control is difficult; (2) The bone china billet contains many ridge raw materials, less plastic raw materials, poor clay molding performance, narrow firing range, poor production process performance, difficult production, and low product qualification rate. It is difficult for general manufacturers to form large-scale production; (3) The thermal stability of the internal performance of bone china is much lower than that of daily-use ceramics made of general materials, and its use is limited

Images