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Preparation method of nano zirconium oxide and chromium oxide composite material

A nano-zirconia and composite material technology, applied in the field of refractory performance improvement, can solve the problems of harsh working environment, material peeling and cracking, material strength decline, etc., and achieve excellent mechanical properties, uniform microstructure and good fine grain structure. Effect

Inactive Publication Date: 2015-03-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the working environment of the lining material is harsh, and it has been in a state of high-temperature gas-liquid erosion for a long time, and has been subjected to the erosion of high-temperature gas and the erosion and penetration of glass liquid or molten slag.
In addition, the sharp change of temperature during the heating and cooling process of the kiln and the temperature fluctuation in the furnace are extremely easy to cause the material to peel off and crack due to internal thermal stress, and the strength of the material itself decreases, thereby greatly reducing the service life of the kiln.

Method used

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  • Preparation method of nano zirconium oxide and chromium oxide composite material
  • Preparation method of nano zirconium oxide and chromium oxide composite material
  • Preparation method of nano zirconium oxide and chromium oxide composite material

Examples

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Embodiment 1

[0024] Embodiment 1: prepare nano zirconia and chromium oxide composite material, concrete steps are as follows:

[0025] Step 1, preparation of dispersion: 0.9wt% maleic acid-acrylic acid copolymer accounting for chromium oxide micropowder, nano zirconia powder and titania micropowder total mass Add 0.08wt% sodium tripolyphosphate as a composite dispersant to deionized water, adjust the pH to 9 with ammonia water, and obtain a dispersion;

[0026] Step 2, prepare slurry: mix 87wt% chromium oxide micropowder, 10wt% nano zirconia powder, 3wt% titanium dioxide micropowder with the dispersion liquid prepared in step 1, and obtain a stable dispersed slurry after ball milling for 6 hours;

[0027] Step 3, drying of the slurry: drying the slurry obtained in step 2 at 120°C to obtain the mixed powder;

[0028] Step 4, forming: adding a PVA aqueous solution with a concentration of 5wt% to the mixed powder obtained in step 3, and making a molded green body under a pressure of 90 MPa; ...

Embodiment 2

[0032] Embodiment 2: Preparation of nano zirconia and chromium oxide composite material.

[0033] The preparation process of embodiment 2 is basically the same as that of embodiment 1, the only difference is that in step 2, 82wt% chromium oxide micropowder, 15wt% nano zirconia, 3wt% titanium dioxide micropowder are mixed with the dispersion prepared in step 1, ball milled After 6 hours, a stable and dispersed slurry was obtained; the molding pressure in step 4 was 110 MPa; the sintering temperature in step 6 was 1550° C., and the holding time was 2.5 hours.

[0034] The bulk density of the composite material of nano zirconia and chromium oxide prepared in embodiment 2 is 5.02g / cm 3 , the porosity is 3.1%, and the three-point bending strength is 260.2MPa.

Embodiment 3

[0035] Embodiment 3: Preparation of nano zirconia and chromium oxide composite material.

[0036] The preparation process of Example 3 is basically the same as that of Example 2, except that the molding pressure in Step 4 is 100 MPa; the sintering temperature in Step 6 is 1350° C., and the holding time is 2.5 hours.

[0037] The bulk density of the composite material of nano-zirconia and chromium oxide prepared in embodiment 3 is 4.39g / cm 3 , the porosity is 16.7%, and the three-point bending strength is 112.6MPa.

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Abstract

The invention discloses a preparation method of a nano zirconium oxide and chromium oxide composite material. The preparation method comprises the following steps: performing ball-milling dispersion to form uniformly dispersed slurry by taking 82-97wt% of pigment-grade chromium oxide micro powder as a matrix, 1-15wt% of nano zirconium oxide as a complexing agent and 3wt% of titanium dioxide micro powder as a sintering aid; and drying the slurry into powder, and then performing bonding forming to finally prepare the nano zirconium oxide and chromium oxide composite material. The nano zirconium oxide and chromium oxide composite material has a fine crystalline structure in which nano zirconium oxide is distributed among chromium oxide crystalline grains or wrapped in the chromium oxide crystalline grains, the volume density after sintering is 4.39-5.11g / cm<3>, and the porosity is 0.9-16.7%. By adopting the preparation method disclosed by the invention, the production of a composite material which has high strength, high compactness and good thermal impact resistance and can be stably operated in a furnace for a long time can be ensured.

Description

technical field [0001] The invention relates to the field of performance improvement of refractory materials, in particular to the improvement of mechanics, sintering and thermal shock resistance of nanometer zirconia and chromium oxide composite refractory materials. Background technique [0002] As an excellent high-temperature refractory material, nano-zirconia + chromium oxide composite material has excellent high temperature resistance, good resistance to alkali-free glass and coal slag erosion, and it has extremely low solubility in coal ash and glass liquid , is the key lining material of alkali-free glass fiber pool kiln and coal gasification furnace. Dense high chromium bricks are often used in the key parts of the kiln where the alkali-free fiberglass tank kiln is in direct contact with the glass liquid, such as the flow hole, the tank wall, the bubbling brick, the feeding port, the tank bottom and the main channel tank wall. It accounts for more than 20% of the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/12
Inventor 杨德安卢丽霞丁春辉翟通张弛
Owner TIANJIN UNIV
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