CN112897881A

CN112897881A - High-temperature iron sand gold glaze and preparation method and application thereof

Info

Publication number: CN112897881A
Application number: CN202110055727.XA
Authority: CN
Inventors: 董伟霞; 曹体浩; 赵田贵; 包启富; 周健儿
Original assignee: Jingdezhen Ceramic Institute
Current assignee: Jingdezhen Ceramic Institute
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2021-06-04

Abstract

The invention discloses a high-temperature iron sand gold glaze which comprises the following raw materials: 30-40 wt% of potassium feldspar, 9-15 wt% of kaolin, 8-15 wt% of phase separation crystallization agent, 0-5 wt% of barium carbonate, 2-6 wt% of dolomite, 15-25 wt% of glass powder and 12-20 wt% of ferric oxide. In addition, a preparation method and application of the high-temperature iron sand gold glaze are also disclosed. According to the invention, through the formula design, the system has a higher melting crystallization temperature and a larger melting temperature range under the condition of an oxidizing atmosphere, so that the defects of poor chemical stability, low glaze hardness and the like of the glaze are effectively overcome, the glaze layer has good chemical stability and high glaze hardness, is compact in structure and high and uniform in crystallization degree, and can well meet the performance requirements of daily ceramics such as high-temperature tea tableware, ceramic ornament decoration and the like.

Description

High-temperature iron sand gold glaze and preparation method and application thereof

Technical Field

The invention relates to the technical field of ceramic glaze, in particular to high-temperature iron sand gold glaze and a preparation method and application thereof.

Background

The Shajin glaze is also called gold sand glaze, and is called golden star glaze in Hebei and Shandong, etc. of China. The twinkling metal bright small pieces and star points in the glaze are small crystal crystals formed in the glaze layer, and like natural placentas produced in Norway, the metal bright small pieces and star points twinkle under certain light, so the glaze is named. In recent years, along with the improvement of living standard of people, the requirements of decoration level and decoration quality of ceramic products are also improved, and the traditional decoration level can not meet the requirements of people. As early as the Song Dynasty, there are rare microcrystalline glaze- "Shajin glaze", "Tianmu glaze" and "eel skin green". The alluvial gold glaze contains thin mica-like scales or glistening reflective crystal crystals suspended in a transparent glaze layer in a transparent vitreous material. These crystals have different surface directions and give a brilliant and sparkling feeling due to reflection of light. Due to the formation characteristics of the alluvial gold glaze, gold flashes under the irradiation of light to give people a visual impact, so that people have a feeling of gorgeous and graceful. The porcelain glaze is used for decorating ceramic tableware, tea sets, ceramic ornaments and the like, gives people a gold luminous feeling, and is very popular with people. However, the alluvial gold glaze in the market in the prior art is low-temperature alluvial gold glaze, even contains lead and exceeds the standard of heavy metals. Even if the lead-free glaze is researched and developed, the glaze is also at a low temperature, such as low-temperature lead-free iron series alluvial gold glaze, the alluvial gold glaze has poor chemical stability and low glaze hardness, the Mohs hardness is only 2 grade, and the glaze is easy to scratch and is difficult to meet the performance requirements of high-temperature tea tableware and ceramic ornament decoration.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the high-temperature iron sand gold glaze, and through the formula design, the system has higher melting crystallization temperature and a larger melting temperature range under the condition of oxidizing atmosphere, so that the defects of poor chemical stability, low hardness of the glaze and the like of the glaze are effectively overcome, and the purpose of good crystallization effect is realized while the high-temperature iron sand gold glaze has good chemical stability and high hardness of the glaze. The invention also aims to provide a preparation method and application of the high-temperature iron sand gold glaze.

The purpose of the invention is realized by the following technical scheme:

the invention provides a high-temperature iron sand gold glaze which comprises the following raw materials: 30-40 wt% of potassium feldspar, 9-15 wt% of kaolin, 8-15 wt% of phase separation crystallization agent, 0-5 wt% of barium carbonate, 2-6 wt% of dolomite, 15-25 wt% of glass powder and 12-20 wt% of ferric oxide.

Furthermore, the phase separation crystallization agent is one or a combination of borax, boric acid, borocalcite and high-boron clinker.

The other purpose of the invention is realized by the following technical scheme:

the preparation method of the high-temperature iron sand gold glaze provided by the invention comprises the following steps: and mixing and ball-milling the raw material compositions, and ageing to obtain the glaze.

In the scheme, the fineness of the mixed ball milling of the preparation method is 0.04-0.06% of the residue of a 325-mesh sieve.

The application of the high-temperature iron sand gold glaze provided by the invention is as follows: and applying the glaze prepared by the preparation method on the surface of the blank, and then sintering under the condition of an oxidizing atmosphere, wherein the glaze firing temperature is 1280-1320 ℃, cooling to 1160-1220 ℃, and preserving heat for 90-120 min to obtain the iron sand golden glaze layer.

The invention has the following beneficial effects:

(1) according to the invention, through optimizing the formula design, the placer gold glaze with stable performance is obtained, the melting temperature is high, the melting temperature range is wide, the influence of the temperature fluctuation of the kiln is small, and the use requirement under the high-temperature condition is well met.

(2) The glaze material has good stability, realizes high-temperature sintering through formula design, has a compact glaze layer structure, small and uniform crystals, high crystallization degree, good chemical resistance of the glaze, high hardness of the glaze, Mohs hardness of 6 grade, low possibility of scratching and dirt absorption, and adjustable thermal expansion coefficient (6.14-6.66 multiplied by 10)^-6/° c), is suitable for various household ceramic blanks.

Drawings

The invention will now be described in further detail with reference to the following examples and the accompanying drawings:

FIG. 1 is a crystal structure diagram of an enamel layer obtained in an example of the present invention;

FIG. 2 is a scanned graph of the binding properties of the green glaze of the glaze layer obtained in the example of the present invention;

FIG. 3 is an XRD pattern of the resulting glaze layer of the present invention.

Detailed Description

The embodiment of the invention provides a high-temperature iron sand gold glaze which comprises the following raw materials: 30-40 wt% of potassium feldspar, 9-15 wt% of kaolin, 8-15 wt% of phase separation crystallization agent, 0-5 wt% of barium carbonate, 2-6 wt% of dolomite, 15-25 wt% of glass powder and 12-20 wt% of ferric oxide. The raw material composition of each example is shown in table 1.

TABLE 1 composition of raw materials (wt%) of high-temperature iron sand gold glaze according to various embodiments of the present invention

High boron frit and B thereof₂O₃The content is more than or equal to 35 percent

Borax to borocalcite in a mass ratio of 1: 1

The preparation method of the high-temperature iron sand gold glaze in each embodiment of the invention comprises the following steps: the raw materials are mixed and ball-milled until the fineness is 0.04-0.06% (shown in table 2) of the 325-mesh sieve residue, and the glaze is obtained after ageing.

The application of the high-temperature iron sand gold glaze in each embodiment of the invention is as follows: after the prepared glaze is applied to the surface of a blank, sintering is carried out under the condition of oxidizing atmosphere, the glaze sintering temperature is 1280-1320 ℃, and the highest temperature is kept for 30 min; and cooling to 1160-1220 ℃, and preserving the temperature for 90-120 min to obtain the iron sand golden glaze layer. The process parameters are shown in table 2.

As shown in figure 1, the iron sand gold glaze layer obtained in the embodiment of the invention has small and uniform crystals in glaze; the blank glaze has good associativity, few bubbles in the glaze and compact glaze layer structure (see figure 2); and has high crystallization degree, and the crystals are mainly alpha-Fe₂O₃. (see FIG. 3). The glaze performance index is shown in table 2.

TABLE 2 fineness of ball milling of glaze according to various embodiments of the present invention, application of the glaze, and performance index of glaze

325 mesh screen residue.

Claims

1. The high-temperature iron sand gold glaze is characterized by comprising the following raw materials: 30-40 wt% of potassium feldspar, 9-15 wt% of kaolin, 8-15 wt% of phase separation crystallization agent, 0-5 wt% of barium carbonate, 2-6 wt% of dolomite, 15-25 wt% of glass powder and 12-20 wt% of ferric oxide.

2. The high-temperature iron sand gold glaze according to claim 1, wherein: the phase separation crystallization agent is one or the combination of borax, boric acid, borocalcite and high-boron clinker.

3. The method for preparing the high-temperature iron sand gold glaze according to claim 1 or 2, which is characterized in that: and mixing and ball-milling the raw material compositions, and ageing to obtain the glaze.

4. The method for preparing the high-temperature iron sand gold glaze according to claim 3, wherein the method comprises the following steps: the fineness of the mixed ball milling is 0.04-0.06% of the rest of 325 meshes.

5. The application of the high-temperature iron sand gold glaze is characterized in that: the glaze prepared by the preparation method of claim 3 or 4 is applied to the surface of a blank body, and then is fired under the condition of oxidizing atmosphere, the glaze firing temperature is 1280-1320 ℃, the temperature is reduced to 1160-1220 ℃, and the temperature is kept for 90-120 min, so that the iron sand golden glaze layer is obtained.