Aluminum oxide ceramic production process

Abstract

The invention discloses an aluminum oxide ceramic production process which is characterized by comprising the following steps: S1, weighing raw materials according to a certain proportion: 130-150 parts of aluminum powder, 20-40 parts of magnesium oxide, 21-24 parts of silicon dioxide, 11-13 parts of mica powder, 6-8 parts of a dispersing agent, 6-8 parts of a combustion improver, 2-4 parts of a crystal inhibitor, 7-9 parts of a plasticizer and 5-7 parts of a defoaming agent; s2, the raw materials in the S1 are subjected to first-time grinding; s3, a plasticizer is added into the raw materials polished in the S2 for secondary polishing; s4, after secondary grinding is completed, a defoaming agent is added into the interior for defoaming; s5, preparing a preliminary ceramic blank; and S6, firing to obtain a finished ceramic product. The aluminum oxide ceramic is simple in process, convenient to popularize, capable of meeting practical requirements, high in bending resistance and good in fracture toughness, and the quality of the ceramic can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of alumina ceramics, and in particular relates to a production process of alumina ceramics. Background Art

[0002] Ceramics is a general term for pottery and porcelain, and is also a kind of arts and crafts in my country. As early as the Neolithic Age, my country already had rough and simple painted pottery and black pottery. The textures of pottery and porcelain are different and their properties are different. Pottery is made of clay with high viscosity and strong plasticity as the main raw material. It is opaque, has fine pores and weak water absorption, and makes a turbid sound when struck. Porcelain is made of clay, feldspar and quartz. It is translucent, non-absorbent, corrosion-resistant, hard and compact, and makes a crisp sound when struck. my country's traditional ceramic arts and crafts are of high quality and beautiful shape, with high artistic value, and are famous all over the world. They are also often made into alumina ceramics.

[0003] At present, the most common metallization process in China is the molybdenum-manganese method. The main formula of the slurry is molybdenum powder, manganese powder, porcelain powder, titanium dioxide, etc. Since manganese is added to the slurry, a manganese spinel phase is formed during the high-temperature metallization process, thereby broadening the sintering temperature and making the metallization process relatively easier. Therefore, the molybdenum-manganese metallization process has been widely used in the field of ceramic and metal sealing. However, the metallized ceramics produced by the molybdenum-manganese method are not suitable for the long-term high temperature and corrosive working conditions of sodium salt batteries, because the addition of manganese causes the corrosion resistance of the metallized layer to deteriorate, thereby affecting the service life of the sodium salt battery. The metallized ceramics produced by the pure molybdenum method can withstand the influence of molten salt corrosion for a long time, and its air tightness and sealing strength are not significantly reduced. Therefore, the pure molybdenum metallization process is particularly important. How to provide a production process for alumina ceramics has become a research topic. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides an alumina ceramic production process, which has the advantage of simple process and solves the problem of complicated prior art.

[0005] The present invention is achieved by a process for producing alumina ceramics, comprising the following steps:

[0006] S1: weigh the raw materials according to a certain proportion: 130-150 parts of aluminum powder, 20-40 parts of magnesium oxide, 21-24 parts of silicon dioxide, 11-13 parts of mica powder, 6-8 parts of dispersant, 6-8 parts of combustion aid, 2-4 parts of crystal inhibitor, 7-9 parts of plasticizer and 5-7 parts of defoamer;

[0007] S2: Use the raw materials in S1 for the first grinding;

[0008] S3: adding plasticizer to the raw material polished in S2 for secondary polishing;

[0009] S4: After the secondary grinding is completed, add defoaming agent inside to defoam;

[0010] S5: making a preliminary ceramic embryo;

[0011] S6: Firing into finished ceramics.

[0012] As a preferred embodiment of the present invention, the aluminum powder in step S1 is aluminum oxide powder, and the mass ratio of magnesium oxide, aluminum oxide and silicon dioxide is x:y:1-xy, wherein x=65-75, y=3-5, and Z=0-10.

[0013] As a preferred embodiment of the present invention, the plasticizer in step S1 is one of benzene polyester plasticizers, benzoate plasticizers, and polyol ester plasticizers, and the dispersant is one of barium stearate, zinc stearate, and zinc stearate.

[0014] As a preferred embodiment of the present invention, the firing time in step S6 is 10-12 hours.

[0015] As a preferred embodiment of the present invention, the alumina ceramic adopts a CaO-Al2O3-SiO2 ternary system, wherein the alumina content is 94% to 96%, and the SiO2 / CaO mass ratio is less than 1.3.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The process of the present invention is simple and easy to promote. It can meet the practical needs of alumina ceramics. The ceramics have strong bending resistance and good fracture toughness, and can effectively improve the quality of ceramics. DETAILED DESCRIPTION

[0018] Embodiment 1

[0019] An embodiment of the present invention provides an alumina ceramic production process, comprising the following steps:

[0020] S1: weigh the raw materials according to a certain proportion: 130 parts of aluminum powder, 20 parts of magnesium oxide, 21 parts of silicon dioxide, 11 parts of mica powder, 6 parts of dispersant, 6 parts of combustion aid, 2 parts of crystal inhibitor, 7 parts of plasticizer and 5 parts of defoamer, the aluminum powder is aluminum oxide powder, the mass ratio of magnesium oxide, aluminum oxide and silicon dioxide is x:y:1-xy, wherein x=65, y=3, Z=3, the plasticizer is one of benzene polyester plasticizer, benzoate plasticizer and polyol ester plasticizer, the dispersant is one of barium stearate, zinc stearate and zinc stearate, the aluminum oxide ceramic adopts CaO-Al2O3-SiO2 ternary system, wherein the aluminum oxide content is 94% to 96%, and the SiO2 / CaO mass ratio is less than 1.3;

[0021] S2: Use the raw materials in S1 for the first grinding;

[0022] S3: adding plasticizer to the raw material polished in S2 for secondary polishing;

[0023] S4: After the secondary grinding is completed, add defoaming agent inside to defoam;

[0024] S5: making a preliminary ceramic embryo;

[0025] S6: Firing into finished ceramics, the firing time is 10 hours.

[0026] Embodiment 2

[0027] An embodiment of the present invention provides an alumina ceramic production process, comprising the following steps:

[0028] S1: weigh the raw materials according to a certain proportion: 140 parts of aluminum powder, 30 parts of magnesium oxide, 22 parts of silicon dioxide, 12 parts of mica powder, 7 parts of dispersant, 7 parts of combustion aid, 3 parts of crystal inhibitor, 8 parts of plasticizer and 6 parts of defoamer, the aluminum powder is aluminum oxide powder, the mass ratio of magnesium oxide, aluminum oxide and silicon dioxide is x:y:1-xy, wherein x=70, y=4, Z=7, the plasticizer is one of benzene polyester plasticizer, benzoate plasticizer and polyol ester plasticizer, the dispersant is one of barium stearate, zinc stearate and zinc stearate, the aluminum oxide ceramic adopts CaO-Al2O3-SiO2 ternary system, wherein the aluminum oxide content is 94% to 96%, and the SiO2 / CaO mass ratio is less than 1.3;

[0029] S2: Use the raw materials in S1 for the first grinding;

[0030] S3: adding plasticizer to the raw material polished in S2 for secondary polishing;

[0031] S4: After the secondary grinding is completed, add defoaming agent inside to defoam;

[0032] S5: making a preliminary ceramic embryo;

[0033] S6: Firing into finished ceramics, the firing time is 11 hours

[0034] Embodiment 3

[0035] An embodiment of the present invention provides an alumina ceramic production process, comprising the following steps:

[0036] S1: weigh the raw materials according to a certain proportion: 150 parts of aluminum powder, 40 parts of magnesium oxide, 24 parts of silicon dioxide, 13 parts of mica powder, 8 parts of dispersant, 8 parts of combustion aid, 4 parts of crystal inhibitor, 8 parts of plasticizer and 7 parts of defoamer, the aluminum powder is aluminum oxide powder, the mass ratio of magnesium oxide, aluminum oxide and silicon dioxide is x:y:1-xy, wherein x=75, y=5, Z=10, the plasticizer is one of benzene polyester plasticizer, benzoate plasticizer and polyol ester plasticizer, the dispersant is one of barium stearate, zinc stearate and zinc stearate, the aluminum oxide ceramic adopts CaO-Al2O3-SiO2 ternary system, wherein the aluminum oxide content is 94% to 96%, and the SiO2 / CaO mass ratio is less than 1.3;

[0037] S2: Use the raw materials in S1 for the first grinding;

[0038] S3: adding plasticizer to the raw material polished in S2 for secondary polishing;

[0039] S4: After the secondary grinding is completed, add defoaming agent inside to defoam;

[0040] S5: making a preliminary ceramic embryo;

[0041] S6: Firing into finished ceramics, the firing time is 12h

[0042] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for producing alumina ceramics, Features: The steps include: S1: weigh the raw materials according to a certain proportion: 130-150 parts of aluminum powder, 20-40 parts of magnesium oxide, 21-24 parts of silicon dioxide, 11-13 parts of mica powder, 6-8 parts of dispersant, 6-8 parts of combustion aid, 2-4 parts of crystal inhibitor, 7-9 parts of plasticizer and 5-7 parts of defoamer; S2: Use the raw materials in S1 for the first grinding; S3: adding plasticizer to the raw material polished in S2 for secondary polishing; S4: After the secondary grinding is completed, add defoaming agent inside to defoam; S5: making a preliminary ceramic embryo; S6: Firing into finished ceramics.

2. A process for producing alumina ceramics according to claim 1, Features: In step S1, the aluminum powder is aluminum oxide powder, and the mass ratio of magnesium oxide, aluminum oxide and silicon dioxide is x:y:1-xy, wherein x=65-75, y=3-5, and Z=0-10.

3. A process for producing alumina ceramics according to claim 1, Features: The plasticizer in step S1 is one of benzene polyester plasticizers, benzoate plasticizers, and polyol ester plasticizers, and the dispersant is one of barium stearate, zinc stearate, and zinc stearate.

4. A process for producing alumina ceramics according to claim 1, Features: The firing time in step S6 is 10-12 hours.

5. A process for producing alumina ceramics according to claim 1, Features: The alumina ceramic adopts a CaO-Al2O3-SiO2 ternary system, wherein the alumina content is 94% to 96% and the SiO2 / CaO mass ratio is less than 1.3.