A kind of transparent lead-free frit glaze with small expansion coefficient and preparation method thereof

A technology of expansion coefficient and lead-free frit, which is applied in the field of daily-use ceramics, can solve the problems that the secondary firing process cannot be adopted, the thermal expansion coefficient of hard porcelain is low, and the high-quality low-temperature frit glaze cannot be matched, and the glaze can be achieved. The firing temperature range is wide, the glaze surface is delicate and bright, and the effect of high transparency

Active Publication Date: 2012-02-01
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, my country produces a large number of hard porcelain fired at about 1350°C. These hard porcelains can be made of high-white and high-transparency daily-use fine porcelain through a single firing process through selection of high-quality raw materials and fine workmanship. However, due to hard The thermal expansion coefficient of the porcelain is too low (α=3.5~5.0×10 -6 / °C), it cannot be matched with high-quality low-temperature frit glaze, so it is impossible to use the secondary firing process of high-temperature biscuit firing and low-temperature glaze firing to upgrade it to high-grade daily-use fine porcelain

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Various raw materials were weighed according to the glaze formula: kaolin 19%, quartz 23%, potassium feldspar 18%, dolomite 5%, wollastonite 2%, calcined talc 14%, zinc oxide 3%, boric acid 3%, boric acid Calcium 10%, alumina 2%, lithium carbonate 1%, the chemical composition of the glaze is: 61.25% SiO 2 , 13.14% Al 2 o 3 , 6.21%B 2 o 3 , 5.34% CaO, 6.92% MgO, 2.87% ZnO, 2.62% K 2 O, 0.82% Na 2 O, 0.40% Li 2 O, 0.09% Fe 2 o 3 , 0.02% TiO 2 . After fully mixing the raw materials, use a high-temperature frit furnace to melt at 1400-1450°C, and quench in water to obtain a frit, then put the frit into a ball mill, and add 0.3% methyl cellulose as a suspending agent at the same time , material: ball: water = 1: 2: (0.5-0.6), the fineness of the glaze slurry is controlled at 0.02-0.05% of the 10,000-hole sieve. After applying glaze to the biscuit body, it is fired at 1150-1200°C to obtain high-grade daily-use fine porcelain products.

Embodiment 2

[0019] Various raw materials were weighed according to the glaze formula: kaolin 16%, quartz 25%, potassium feldspar 21%, wollastonite 4%, burnt talc 17%, zinc oxide 2%, boric acid 5%, calcium borate 7%, oxide Aluminum 3%, the chemical composition of the glaze is: 64.24% SiO 2 , 14.33% Al 2 o 3 , 6.04% B 2 o 3 , 4.60% CaO, 4.87% MgO, 1.93% ZnO, 2.81% K 2 O, 0.90% Na 2 O, 0.08% Fe 2 o 3 , 0.03% TiO 2 . The frit melting temperature is 1450-1500° C., the glaze firing temperature is 1180-1220° C., and other production processes are the same as in Example 1.

Embodiment 3

[0021] Various raw materials were weighed according to the glaze formula: kaolin 22%, quartz 19%, potassium feldspar 15%, wollastonite 6%, burnt talc 12%, zinc oxide 5%, boric acid 7%, calcium borate 12%, oxide Aluminum 1%, strontium carbonate 1%, the chemical composition of the glaze is: 59.13% SiO 2 , 12.02% Al 2 o 3 , 9.44% B 2 o 3 , 5.18% CaO, 5.25% MgO, 4.86% ZnO, 2.41% K 2 O, 0.69% Na 2 O, 0.73% SrO, 0.09% Fe 2 o 3 , 0.02% TiO 2 . The frit melting temperature is 1400-1450° C., the glaze firing temperature is 1140-1190° C., and other production processes are the same as in Example 1.

[0022] The coefficient of thermal expansion (×10 of each embodiment of table 1 -6 / °C)

[0023] Example

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PUM

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Abstract

The invention relates to a transparent lead-free frit glaze with a small expansion coefficient and a preparation method thereof. The chemical composition of the frit glaze is: 59-66% SiO2, 10-15% Al2O3, 5-10% B2O3, 3-6% CaO, 4-8% MgO, 0-3% K2O, 0-2% Na2O, 0-1% Li2O, 1-5% ZnO, 0-2% SrO, the raw material formula used is: kaolin 10-25%, Quartz 15-30%, potassium feldspar 10-25%, dolomite 0-8%, wollastonite 2-6%, burnt talc 10-20%, zinc oxide 1-6%, boric acid 2-8%, boric acid Calcium 5-15%, aluminum oxide 1-5%, lithium carbonate 0-2%, strontium carbonate 0-3%. The expansion coefficient of the frit glaze of the present invention is 3.7~4.5×10-6 / °C (RT~500°C), the melting temperature is 1400°C~1500°C, the glaze firing temperature is 1130°C~1230°C, and the glaze surface is delicate and bright , high transparency, small expansion coefficient, lead-free dissolution, especially suitable for hard porcelain body with low expansion coefficient for secondary firing.

Description

technical field [0001] The invention belongs to the technical field of daily-use ceramics, and in particular relates to a transparent lead-free frit glaze with a relatively low expansion coefficient and a preparation method of the frit glaze. Background technique [0002] Nowadays, the production of high-grade daily-use fine porcelain at home and abroad all adopts the secondary firing process without exception. The secondary firing process can be divided into two types: ① low-temperature plain firing, high-temperature glaze firing, ② high-temperature plain firing, low-temperature glaze firing. Internationally, European hard porcelain such as Copenhagen porcelain from Denmark, Seiffel porcelain from France, Saxony porcelain from German Meissen Company, etc. are used in the international application of low-temperature bisque firing and high-temperature glaze firing. Porcelain is also produced using this process. Both the blank and the glaze are fired at high temperature in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/86
Inventor 江伟辉包镇红苗立锋谭训彦虞澎澎刘健敏
Owner JINGDEZHEN CERAMIC UNIV
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