CN101168489A

CN101168489A - Method for producing crack under glaze at low-temperature

Info

Publication number: CN101168489A
Application number: CNA2007100358632A
Authority: CN
Inventors: 成伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-30
Filing date: 2007-09-30
Publication date: 2008-04-30
Anticipated expiration: 2027-09-30
Also published as: CN100534958C

Abstract

The invention relates to a method for producing low-temperature under-glaze crack, which comprises first preparing a blank via traditional art, biscuit firing the blank, and coating a middle layer on the blank, wherein the middle layer contains 48-55% silica powder, 25-32% feldspar powder, 5-12% 1185 glaze, and 8-15% caoline. The coating process comprises first adding water with the prepared materials of the middle layer to prepare a mixture which Baum density is 38-42 degrees, and arranging the blank in the mixture to be immerged for 3-4s until the coat thickness reaches 0.4-0.6mm, then drawing and decorating the coated and dried middle layer, and feeding and firing half-finished product in furnace, finally coating transparent glaze on the fired middle layer and processing glost firing in furnace to obtain final product. The invention can overcome the defects of traditional crack glaze art which fails to produce low-temperature ceramic tableware, tea set and coffee set, while the produced ceramic product has integral surface glaze, without leaked and polluted by external liquid. And the glaze has decorative crack below. The invention has low lead content, thereby entering into Europe and America markets successfully, with significant social and economic benefits.

Description

A kind of production method of crack under glaze at low-temperature

Technical field

The present invention relates to a kind of production method of ceramic, especially the manufacture craft of crackle glaze.

Background technology

The surface has the ceramic of crackle glaze to have strong decorative effect and aesthetic, receives praises from customers.The making method of tradition low temperature crackle glaze is to spread the higher low temperature frit glaze of one deck coefficient of expansion on low temperature goods base substrate.In sintering procedure,, make glaze under the effect of tensile stress, produce be full of cracks and formation crackle glaze because the coefficient of expansion of base and glaze there are differences.This flaw shape is formed in whole glazed layer, that is to say that crackle is on the goods top layer.Because the water-intake rate of the low-temp ceramics goods base substrate of firing temperature between 1000～1100 ℃ is 7～20%, thereby the scope of crackle glaze maker skill application is very restricted, can not produces food product containers such as meal, tea set, coffee service, coffee set.If produce meal, tea set, coffee service, coffee set with crackle glaze, though good decorating effect, beautiful appearance, outer liquid is known from experience to infiltrate in the base substrate by utensil top layer cracks and is polluted, and can't clean.In addition, used low temperature crackle glaze contains the lead frit of high level at present, is difficult to detect by California, USA 65.

Summary of the invention

The production method that the purpose of this invention is to provide a kind of crack under glaze at low-temperature accomplishes that ceramic had both had the decorative effect of crackle glaze, does not have easy osmosis pollution of outside liquid and the lead content problem that exceeds standard again.

Production stage of the present invention is as follows:

1, makes base substrate by traditional technology.

2, carry out the base substrate biscuiting by traditional technology, 1030～1060 ℃ of biscuiting temperature.

3, on base substrate, apply the middle layer.

Described middle layer prescription is ground silica 48～55%, Feldspar Powder 25～32%, 1185 glaze 5～12%, kaolin 8～15%; Wherein 1185 glaze have and produce house and give birth to factory, for example Taiwan rainbow U.S. company etc.Method of application is earlier the middle layer raw material for preparing to be added water to make the mixed liquid that Baume concentration is 38～42 degree, base substrate is placed mixed liquid to soak again and executes for 3～4 seconds, makes coat-thickness reach 0.4～0.6 millimeter.

4, on the middle layer that applies, paint coloured silk, decoration.

5, will paint and color decorate good work in-process and pack that full automatic tunnel furnace is roasting to be burnt into, roasting 1030～1060 ℃ of the temperature of burning, roasting 4.5～6.5 hours burning time.

6, apply one deck and the transparent that the base substrate coefficient of expansion adapts on roasting burned middle layer, reenter the Bristol glaze burning, 990～1100 ℃ of temperature of glaze firing obtain finished product after the glaze firing.

Principle of work of the present invention is that the coefficient of expansion in middle layer is higher than base substrate, produces tensile stress because of the coefficient of expansion is different in roasting burning process, makes the middle layer produce be full of cracks, forms crackle; Apply at last the transparent that the one deck and the base substrate coefficient of expansion adapt again on the middle layer, the crackle in middle layer is clearly reflected by transparent after the glaze firing.This moment, ceramic top layer glaze was complete, did not have crackle, and outside liquid can't infiltrate in the base substrate.

The present invention has overcome the defective that traditional crackle glaze technology can not be produced low-temp ceramics matter meal, tea set, coffee service, coffee set, the ceramic top layer glaze of producing is complete, can the significant crackle of decorative effect not arranged under the glaze by the outside liquid osmosis pollution, lead content is little, can successfully enter American-European market.In American-European market to the demand of low-temp ceramics goods under the situation of pyroceramic, the present invention has huge economic and social benefit.

Embodiment

Embodiment one

Production stage is that the middle layer prescription is ground silica 50%, Feldspar Powder 30%, 1185 glaze 10%, kaolin 10% as mentioned above.

Embodiment two

Production stage is identical with example one, and different is that the middle layer prescription is ground silica 55%, Feldspar Powder 25%, 1185 glaze 12%, kaolin 8%.

Embodiment three

Production stage is identical with example one, and different is that the middle layer prescription is ground silica 48%, Feldspar Powder 32%, 1185 glaze 5%, kaolin 15%.

Claims

1. the production method of a crack under glaze at low-temperature is characterized in that production stage is as follows:

A, make base substrate by traditional technology;

B, carry out the base substrate biscuiting by traditional technology, 1030～1060 ℃ of biscuiting temperature;

C, on base substrate, apply the middle layer;

Described middle layer prescription is ground silica 48～55%, Feldspar Powder 25～32%, 1185 glaze 5～12%, kaolin 8～15%; Method of application is earlier the middle layer raw material for preparing to be added water to make the mixed liquid that Baume concentration is 38～42 degree, base substrate is placed mixed liquid to soak again and executes for 3～4 seconds, makes coat-thickness involve 0.4～0.6 millimeter;

D, on the middle layer that applies, paint coloured silk, decoration;

E, will paint and color decorate good work in-process and pack that full automatic tunnel furnace is roasting to be burnt into, roasting 1030～1060 ℃ of the temperature of burning, roasting 4.5～6.5 hours burning time;

F, apply one deck and the base substrate coefficient of expansion transparent that adapts on roasting burned middle layer, reenter the Bristol glaze burning, 990～1100 ℃ of temperature of glaze firing obtain finished product after the glaze firing.