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Inorganic binder, preparation method and its application in preparation of porous ceramics

An inorganic binder and a technology of the binder are applied in the field of inorganic binder, preparation and its application in the preparation of porous ceramics, which can solve the problems of poor material operability, reduction of ceramic firing temperature, deformation, etc. To achieve the effect of increasing the bonding area of ​​grain boundaries and improving the strength

Active Publication Date: 2008-05-21
江西高环陶瓷科技股份有限公司
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  • Application Information

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Problems solved by technology

Although the firing temperature of ceramics can be significantly reduced after using these two types of inorganic binders, there are obvious disadvantages.
The biggest disadvantage of the former inorganic binders that produce a glass phase is that the glass phase they form in the ceramic will reduce the high temperature performance of the ceramic
The disadvantages of aluminum phosphate binders include: 1. The acidity is too strong, which will cause serious corrosion to the equipment; 2. Aluminum dihydrogen phosphate is easy to absorb moisture and stick, making the operability of materials worse; 3. Dihydrogen phosphate Aluminum decomposes at high temperature and produces a large amount of water, which can easily form air bubbles in the ceramic or deform it

Method used

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  • Inorganic binder, preparation method and its application in preparation of porous ceramics

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Experimental program
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Effect test

Embodiment 1

[0021] Mix 1.20 g of boric acid with 3.00 g of phosphoric acid solution (mass concentration: 85%), and heat to 100° C. to make a sol. Then, 100 g of aluminum hydroxide powder (median particle size: 4.10 μm) was added into the cooled sol, ground and mixed to obtain an inorganic binder. Take 2.00g of inorganic binder and mix evenly with 18g of silicon carbide powder (median particle size is 20μm). Afterwards, 3 g of graphite powder (with a median particle size of 10 μm) and 1 g of hydroxymethylcellulose solution (with a mass concentration of 2%) were added and mixed uniformly. The obtained silicon carbide powder mixture was dry-pressed with a pressure of 50 MPa. The green body is fired in an air atmosphere at 1300°C, and the holding time is 2h. The results show that the flexural strength of the sample is 12.6MPa, and the porosity is 46.8%.

Embodiment 2

[0023] With embodiment 1, just do not add pore forming agent graphite powder. The bending strength of the obtained porous ceramic sample was 28.9MPa, and the porosity was 37.5%.

Embodiment 3

[0025] Same as in Example 1, the aluminum hydroxide powder was replaced by aluminum oxide powder (median particle size: 1.49 μm), and the amount of boric acid was 1.80 g. The bending strength of the obtained porous ceramic sample was 10.1MPa, and the porosity was 45.3%.

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Abstract

The invention relates to an inorganic bond, a preparation method thereof and an application for the preparation of a porous ceramic thereof. The bond consists of alumina and / or aluminum hydroxide, phosphoric acid and boric acid, wherein, the weight percentage content of the alumina and / or the aluminum hydroxide is 70 percent to 99.5 percent, the weight percentage content of the phosphoric acid is 30 percent to 0.5 percent, and additionally the weight percentage content of the boric acid is 0 percent to 15 percent. The weight percentage content of the aluminum hydroxide is converted into Al2O3. The mol ratio of phosphor and aluminum is less than one. When the bond is used for preparing for the porous ceramic, firstly the granular diameter of the alumina or the aluminum hydroxide used for preparing for the bond is confirmed, and the granular diameter of the alumina or the aluminum hydroxide for using is 0.01 time to 0.5 time of the granular diameter of ceramic powder material; non-oxide ceramic powder material is mixed uniformly and mixed uniformly with pore-forming agent or vesicant to be molded and sintered, the sintering temperature is between 900 DEG C to 1600 DEG C. The sintering atmosphere is processed in air or under the inert atmosphere.

Description

technical field [0001] The invention relates to the preparation of an inorganic binder and its application in the preparation of porous ceramic materials. Background technique [0002] From daily-use ceramics to various functional ceramics, a large number of ceramic products accompany people's lives. The firing of ceramics, especially the firing of high-performance ceramics generally requires a temperature of 1600 ° C or even higher. High-temperature firing inevitably consumes a lot of energy, and imposes strict requirements on kiln materials. Therefore, reducing the firing temperature of ceramics can directly reduce the investment cost and production cost of ceramic enterprises in terms of energy consumption and equipment purchase. Especially when the global energy crisis is getting worse and environmental protection is becoming more and more urgent, it is of great significance to reduce the firing temperature of ceramics. [0003] So far, many literatures have reported ...

Claims

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Application Information

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IPC IPC(8): C04B37/00
Inventor 席红安李勤张继周张义刚王若钉
Owner 江西高环陶瓷科技股份有限公司
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