Preparation method of nano zirconia-toughened high-chromium refractory material

A technology of nano-zirconia and refractory materials, which is applied in the field of toughening refractory materials, can solve the problems of limited increase in density and large difference in corrosion resistance of magnesia-chromium spinel, and achieve obvious dispersion effect and high thermal shock resistance property, uniform microstructure

Inactive Publication Date: 2015-02-18
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The addition of alumina will form a solid solution with chromium oxide to promote sintering densification and improve material strength and thermal shock resistance. The addition of magnesium oxide and chromium oxide to form magnesia-chromium spinel can also improve thermal shock resistance, but these two methods have great impact on The increase in density is limited, and the corrosion resistance of the produced magnesia-chromium spinel is quite different from that of chromium oxide itself.

Method used

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  • Preparation method of nano zirconia-toughened high-chromium refractory material
  • Preparation method of nano zirconia-toughened high-chromium refractory material
  • Preparation method of nano zirconia-toughened high-chromium refractory material

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Embodiment 1

[0029] Example 1: Best choice of dispersion

[0030] Mix ammonium bicarbonate, ammonium citrate, polyethylene glycol 2000 (PEG2000), polyethylene glycol 20000 (PEG20000), MA / AA and MA / AA / sodium tripolyphosphate composite dispersant with chromium oxide micropowder, nano 0.2wt%, 0.1wt%, 1wt%, 0.1wt%, 0.9wt% of zirconia powder (3wt% chromium oxide micropowder quality) and titanium dioxide (3wt% chromia micropowder quality) powder total mass 11.05g , and 0.9wt% / 0.08wt% (the selection of each component and percentage is the optimal dispersion amount of each dispersant) into 10ml deionized water and adjust the pH to 9, and place it in a graduated test tube of equal size It was observed that only MA / AA and MA / AA and sodium tripolyphosphate composite dispersant can make the powder co-sediment. The suspensions of other components are layered into two concentrations of suspensions, indicating that these dispersants have inhomogeneous dispersion effects on powders of different particle ...

Embodiment 2

[0032] Embodiment 2: the optimal value of dispersant addition

[0033] Step 1, preparation of dispersion liquid: prepare dispersion liquid with maleic acid-acrylic acid copolymer (MA / AA) as dispersant, the addition amount of MA / AA is respectively 0.6% of the total mass of chromium oxide micropowder, nano zirconia powder and titanium dioxide micropowder. wt%, 0.9wt% and 1.2wt%; added to deionized water, adjusted to pH 9 with ammonia water, to obtain a dispersion;

[0034] Step 2, preparation of slurry: 94wt% Cr 2 o 3 Micropowder, 3wt%TiO 2 Micropowder and 3wt% nanometer ZrO 2 Mix the powder with the dispersion liquid obtained in step 1, and obtain a stable dispersed slurry after ball milling for 6 hours;

[0035] Step 3, drying of the slurry: drying the slurry obtained in step 2 at 120°C to obtain the mixed powder;

[0036] Step 4, forming: adding a PVA aqueous solution with a concentration of 5wt% to the mixed powder obtained in step 3, and pressing it to form a green bod...

Embodiment 3

[0039] Embodiment 3: Determination of optimum molding pressure

[0040] Step 1, preparation of dispersion liquid: use maleic acid-acrylic acid copolymer (MA / AA) as dispersant to prepare dispersion liquid, the addition amount of MA / AA is respectively 0.9% of the total mass of chromium oxide micropowder, nano zirconia powder and titanium dioxide micropowder wt%, added to deionized water, adjusted to pH 9 with ammonia water, to obtain a dispersion;

[0041] Step 2, preparation of slurry: 94wt% Cr 2 o 3 Micropowder, 3wt%TiO 2 Micropowder and 3wt% nanometer ZrO 2 Mix the powder with the dispersion liquid obtained in step 1, and obtain a stable dispersed slurry after ball milling for 6 hours;

[0042] Step 3, drying of the slurry: drying the slurry obtained in step 2 at 120°C to obtain the mixed powder;

[0043] Prepare two mixed powders according to the above steps

[0044] Step 4, forming: adding PVA aqueous solution with a concentration of 5wt% to each part of the mixed pow...

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Abstract

The invention discloses a preparation method of a nano zirconia-toughened high-chromium refractory material, which can produce a high-chromium material which has the advantages of favorable thermal shock resistance and low cracking tendency and can stably operate inside the kiln for a long time. The method comprises the following steps: by using 91-97 wt% of pigment-grade chrome oxide micropowder as a base, 1-6 wt% of nano zirconia powder as an additive and 3 wt% of titanium dioxide micropowder as a combustion assistant, dispersing by ball milling to form a uniformly dispersed slurry, drying the slurry to obtain powder, and carrying out binding molding to obtain the Cr2O3-ZrO2-TiO2 material. The Cr2O3-ZrO2-TiO2 high-chromium refractory material is a fine crystalline structure formed by distributing nano zirconia powder among the chrome oxide crystal grains or coating the nano zirconia powder among the chrome oxide crystal grains; and after the refractory material is sintered, the volume density is 3.52-4.68 g / cm<3>, and the porosity is 9.8-33.2%. The high-chromium refractory material has the advantages of higher compactness and higher thermal shock resistance.

Description

technical field [0001] The invention relates to the field of toughening refractory materials, in particular to a nano zirconia toughened high-chromium refractory material and its preparation. Background technique [0002] High chromium materials are often used as key components in alkali-free fiberglass furnaces and coal gasifiers due to their good high-temperature performance, low solubility of chromium oxide in ash and glass, and remarkable corrosion resistance. Lining material. 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 molten glass or slag. In addition, the sharp change in temperature during the heating and cooling process of the kiln and the temperature fluctuation in the furnace are extremely easy to cause material peeling and cracking due to internal thermal stress, thereby gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/12C04B35/622
Inventor 杨德安卢丽霞丁春辉翟通
Owner TIANJIN UNIV
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