New type bone china, and producing method

Abstract

This invention relates to a method for manufacturing new type bone porcelain. The bone porcelain is composed of: SiO2 50-60 wt.%, Al2O3 20-30 wt.%, P2O5 1.8-3.5 wt.%, CaO 2-5 wt.%, MgO 0.2-0.5 wt.%, K2O and Na2O 3-5 wt.%. The crystal phase content is 50-70 wt. % in the porcelain body. The main crystal phase is mullite, and the minor crystal phases are beta-Ca3 (PO4)2 and anorthite. The bone porcelain is manufactured from: bone ashes 5-10 wt.%, Al powder 5-10 wt.%, kaolin 25-35 wt.%, and porcelain stone 45-60 wt.%. The bone porcelain has such advantages as good appearance, thin external wall, light weight, good light transmittance and good thermal stability. The title method has such advantages as low bon ashes addition, wide sintering range, high quality goods rate, low manufacturing cost and wide raw material resources, and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of ceramics, and relates to a novel bone china and a production method thereof. Background technique [0002] Bone China is a kind of high-grade porcelain recognized in the world. It has the characteristics of fine porcelain, smooth, thin carcass, light weight, and good light transmission performance. There are following problems in its production technology: 1, the thermal stability of product is poor. 2. Because the structure of the composition of bone china in the fired body is close to the eutectic point of tricalcium phosphate, anorthite and silicic acid, the liquid phase content is large and the reaction is violent, so it is easy to deform, so it is advisable to adopt For the buckle firing method, the existing mature technology can only use bisque firing and then glaze firing twice, the sintering range is narrow, the firing is difficult to control, the authenticity rate is relatively low, energy waste...

AI Technical Summary

Problems solved by technology

[0002] Bone China is a kind of high-grade porcelain recognized in the world. It has the characteristics of fine porcelain, smooth, thin carcass, light weight, and good light transmission performance. There are following problems in its production process: 1, the thermal stability of product is poor

2. Because the structure of the composition of bone china in the fired body is close to the eutectic point of tricalcium phosphate, anorthite and silicic acid, the liquid phase content is large and the reaction is violent, so it is easy to deform, so it is advisable to adopt Buckle firing method, the existing mature technology can only use biscuit firing and then glaze firing twice, the sintering range is narrow, the firing is difficult to control, the authenticity rate is relatively low, energy waste is large, and the production cost is high

3. Lack of raw materials such as ashes

The amount of crystal phase in the porcelain body accounts for 50-70% (weight percentage), the quartz crystal grain is less than 25μm, and the main crystal phase is α-cristobalite, SiO 2 The ingredients are introduced with quartz and quartz glass powder. The invention mainly uses quartz glass powder to improve thermal stability, and uses wollastonite crystals to interweave needles in the porcelain body to improve the mechanical strength of the porcelain. Although the patent can once Burning still has the following defects: 1. It has been proved by practice that the ashes as the main raw material still need about 20% to achieve the effect described in the patent, and the problem of raw material supply has not been solved; 2. Although the use of quartz is beneficial to improve thermal stability However, if the particles are too small, it will affect the transparency of porcelain, and if they are too large, the mechanical strength will be reduced; 3. In the raw material ratio, there is a lack of raw materials that can play a role in supporting the skeleton, and the problem of deformation during the firing process has not been solved. Genuine products The production rate is too low, the production cost is high, and there is no economic feasibility for industrialized large-scale production; 4. The firing range is narrow, because the formula composition of bone ash china forms a structure that is close to that of tricalcium phosphate, calcium phosphate, etc. The eutectic part of feldspar and silicic acid has a lot of liquid phase content, and the liquid phase reaction is violent when it is formed, which is prone to defects such as deformation, burning, etc.

Therefore, this patent does not fundamentally solve the problems of poor thermal stability, less raw materials, and high cost of bone china from high-grade porcelain to ordinary consumers, and has not yet formed a mature process required for industrialized mass production of one-time firing, which needs further improvement