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Preparation method for aluminum titanate ceramic

A technology of ceramic products and aluminum titanate, which is applied in the field of preparation of aluminum titanate ceramic products, can solve the problems of short production cycle, unstable quality, high cost, etc., and achieve the effects of short production cycle, environmental protection and saving processing cost

Inactive Publication Date: 2013-10-16
无锡特科精细陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing aluminum titanate ceramic products. On the one hand, it can solve the problems of long cycle, high cost, and unstable quality of the traditional process, and on the other hand, it does not need to use expensive metal salts for chemical Synthesis, no incidental product formation, no harm to the environment, and compared with traditional methods, the production cycle is short, the cost is low, and the product has good thermal shock resistance, which can achieve the purpose of being suitable for industrialized mass production at low cost

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  • Preparation method for aluminum titanate ceramic
  • Preparation method for aluminum titanate ceramic
  • Preparation method for aluminum titanate ceramic

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preparation example Construction

[0025] The present invention proposes a method for preparing aluminum titanate ceramic products, which includes the following steps or operations.

[0026] Step 1: Pour the adhesive, aluminum oxide powder, titanium oxide powder, and stabilizer into a ball mill bottle and ball mill and mix evenly to obtain a suspension.

[0027] In one embodiment, this step can be specifically carried out as follows: polyvinyl alcohol aqueous solution, aluminum oxide powder and titanium oxide powder with a molar ratio of 1:1, and MgO, Fe 2 o 3 , SiO 2 ,ZrSiO 4 Or one or several nanoscale ultrafine powder stabilizers composed of mullite are poured into a ball mill bottle and mixed evenly to obtain a suspension, wherein the purity of the alumina powder and the titanium oxide powder is greater than Or equal to 99%.

[0028] In another embodiment, it also includes pouring a dispersant into a ball mill bottle, preferably, the dispersant is ammonium citrate.

[0029] Step 2, drying the suspensio...

Embodiment 1

[0039] Weigh 40 grams of polyvinyl alcohol and dissolve it in 2000 grams of deionized water, pour it into a 5L ball mill bottle after fully dissolving, add 1020 grams of alumina powder (purity is 99%, average particle size is 1.5 μm) and 800 grams of titanium oxide powder (purity is 99%, average particle size is 1 μ m), weigh 180 grams of silicon oxide and 90 grams of magnesium oxide, and add in the ball mill bottle at the same time, described silicon oxide and magnesium oxide are analytical pure, with 20 grams of ammonium citrate As a dispersant, pour it into a ball mill bottle, pour out the suspension after 24 hours of ball milling, dry and remove the water, grind the ceramic powder and pass it through a 500-mesh screen, and prepare a crucible with a volume of 0.25 liters by isostatic pressing. The wall thickness is 10 mm. After slow debinding, it is put into a high-temperature sintering furnace and sintered into products.

[0040] Among them, the temperature rise curve dur...

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Abstract

The invention discloses a preparation method for an aluminum titanate ceramic. According to the invention, industrial alumina and titanium oxide are used as basic raw materials, one or more raw materials selected from the group consisting of MgO, Fe2O3, SiO2, ZrSiO4, mullite and the like are used stabilizing agents, and an aqueous polyvinyl alcohol solution is used as a binder; a mixture of the above-mentioned ceramic raw materials is uniformly mixed through ball milling and is then dried to remove moisture, a desired ceramic body is compacted through isostatic pressing, and binder removal and high temperature sintering are successively carried out so as to obtain the ceramic. The preparation method provided by the invention omits the traditional procedure of preparation of aluminum titanate powder before preparation of an aluminum titanate product, overcomes the problems of a long cycle, high cost, instable quality and the like of traditional processes and has the advantages of conservation of processing cost, environmental protection, a short production period, good thermal shock resistance of the product and suitability for industrial mass low-cost production.

Description

technical field [0001] The invention relates to a preparation method of ceramic products, in particular to a preparation method of aluminum titanate ceramic products. Background technique [0002] With the development of the current industry, the demand for ceramic materials with excellent high temperature resistance and thermal shock resistance is becoming more and more urgent. Aluminum titanate ceramics are excellent refractory materials with low thermal expansion coefficient and high melting point. It has the best high temperature resistance performance in the expansion material, but it still has two major defects: one is that due to the anisotropy of the thermal expansion coefficient, a large number of microcracks will be generated in the material during the sintering and cooling process, which will reduce the mechanical properties; two. Aluminum titanate ceramic crystals are easy to decompose in the range of 900-1300°C to form rutile and corundum, thus losing its low ex...

Claims

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Application Information

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IPC IPC(8): C04B35/478C04B35/622
Inventor 刘名剑王征
Owner 无锡特科精细陶瓷有限公司
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