CN115417680B - Aluminum titanate-mullite refractory material for high-thermal shock kiln furniture and preparation method thereof - Google Patents
Aluminum titanate-mullite refractory material for high-thermal shock kiln furniture and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a preparation method of a refractory material for aluminum titanate-mullite high-thermal shock kiln furniture, which comprises the following steps of mixing 60 mullite, industrial aluminum titanate and ferric oxide, co-grinding, stamping and forming, preserving heat for 16h in a high-temperature tunnel kiln according to a 2 h/trolley system at 1550 ℃ and cooling according to the system to obtain a composite phase blank; mixing and co-grinding sillimanite, industrial alumina powder, silica micropowder and Guangxi white mud to obtain mixed powder; crushing the composite phase blank into blank aggregate, mixing according to the proportion of 25% of 1-3mm blank aggregate, 15% of 0-1mm blank aggregate, 20% of 1-3mm60 mullite aggregate and 40% of mixed powder, adding a bonding agent, performing stamping forming, and finally performing heat preservation for 16h at 1550 ℃ in a high-temperature tunnel kiln according to a 2 h/trolley system, and performing cooling according to the system to obtain the composite phase blank. The aluminum titanate mullite composite material prepared by the method overcomes the defects of low strength and easy decomposition of aluminum titanate, has a lower thermal expansion coefficient, and has higher strength and better thermal shock resistance, thereby prolonging the service life of kiln furniture.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a refractory material for aluminum titanate-mullite high-thermal shock kiln furniture and a preparation method thereof.
Background
At present, most of kiln furniture refractory materials produced by domestic manufacturers are poor in thermal shock resistance, unstable in quality and short in service life, wherein the cordierite-mullite refractory material has excellent thermal shock resistance, but the high-temperature load deformation temperature is low; the mullite-corundum refractory material has higher chemical stability and use temperature, but has poorer thermal shock resistance; silicon carbide refractory materials have good high-temperature load deformation temperature, but are easy to erode in strong oxidizing atmosphere and limited, so that refractory materials for high-grade kiln furniture mainly depend on imported products.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a refractory material for aluminum titanate-mullite high-thermal shock kiln furniture.
The invention aims at realizing the following technical proposal, a preparation method of a refractory material for aluminum titanate-mullite high thermal shock kiln furniture, which comprises the following steps,
1) Preparing mullite aluminum titanate composite phase blank: mixing and co-grinding 60 mullite, industrial aluminum titanate and iron oxide according to the mass ratio of 25:25:1, then stamping and forming under a 1000T press, finally preserving heat for 16h in a high-temperature tunnel kiln according to a 2 h/trolley system at 1550 ℃ and cooling according to the system to obtain the composite material;
2) Preparing mixed powder: mixing and co-grinding sillimanite, industrial alumina powder, silica micropowder and Guangxi white mud with the mass ratio of 11:20:5:4;
3) Crushing mullite aluminum titanate composite phase blank into blank aggregate, mixing according to the proportion of 25% of 1-3mm blank aggregate, 15% of 0-1mm blank aggregate, 20% of 1-3mm60 mullite aggregate and 40% of mixed powder, adding a bonding agent, then punching and forming under a 1000T press, and finally preserving heat for 16h at 1550 ℃ in a high-temperature tunnel kiln according to a 2 h/trolley system, and cooling according to the system to obtain the mullite aluminum titanate composite phase blank.
Preferably, in the step 1), the 60 mullite, the industrial aluminum titanate and the ferric oxide are mixed and co-ground to 200 meshes, and the sieving rate is more than 95 percent.
Preferably, in the step 2), the sillimanite, the industrial alumina powder, the silica micropowder and the Guangxi white mud are mixed and co-ground to 200 meshes, and the sieving rate is more than 95 percent.
Preferably, the binding agent is pulp waste liquid.
The aluminum titanate-mullite composite material is prepared by adopting a raw material pre-synthesis preparation method, a matrix part co-grinding production mode and 3 forms of introducing an iron oxide additive into the raw material, overcomes the defects of low strength and easy decomposition of aluminum titanate, has a lower thermal expansion coefficient, and is expected to have higher strength and better thermal shock resistance at the same time when being used as the raw material for preparing the refractory material for high Wen Yaoju, so that the service life of the refractory material for kiln furniture is prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following description will be made in detail with reference to the technical solutions in the specific embodiments.
The embodiment of the preparation method of the refractory material for the aluminum titanate-mullite high thermal shock kiln furniture comprises the following steps of,
1) 60 mullite and aluminum titanate were mixed and co-milled in the proportions shown in Table 1 and then pressed in a 1000T press
| Numbering device | Al2O3 | TiO2 | SiO2 | 60 mullite to aluminum titanate |
| 1 | 63.9 | 22 | 14.1 | 5∶5 |
TABLE 1 60 ratio of mullite to aluminum titanate
And (3) performing lower punch forming, then performing heat preservation for 16h in a high-temperature tunnel kiln according to a 2 h/trolley system at 1550 ℃, performing cooling according to the system, detecting to obtain values of apparent porosity, volume density and water absorption, and performing a decomposition experiment at 1100 ℃ for 100h to obtain a decomposition rate index, wherein the decomposition rate index is shown in Table 2.
| Numbering device | Apparent porosity/% | Bulk Density/(g cm-3) | Water absorption/% | Decomposition rate/% |
| 1 | 21 | 2.30 | 8 | 26.1 |
TABLE 2 decomposition rate index of 60 mullite and aluminum titanate samples without iron oxide added
As can be seen from the detection results, the decomposition rate was 26.1, which was still too high.
Based on the table 1, 60 mullite, industrial aluminum titanate and iron oxide are mixed and co-ground to 200 meshes according to the mass ratio of 25:25:1, the sieving rate is more than 95%, then the mixture is formed by punching under a 1000T press, a high-temperature tunnel kiln is subjected to heat preservation for 16 hours according to a 2 h/trolley system at 1550 ℃ and is subjected to cooling according to the system, the mullite aluminum titanate composite phase blank is obtained, the values of apparent porosity, volume density and water absorption are obtained through detection, and then the decomposition experiment is carried out at 1100 ℃ for 100 hours, so that the decomposition rate index is obtained, and the index is shown in the table 3.
| Numbering device | Apparent porosity/% | Bulk Density/(g cm-3) | Water absorption/% | Decomposition rate/% |
| 1 | 9 | 3.02 | 3 | 0 |
TABLE 3 decomposition Rate index after addition of iron oxide for mullite and aluminum titanate samples
According to the detection result, the addition of the ferric oxide effectively inhibits the decomposition of the aluminum titanate.
2) Mixing sillimanite, industrial alumina powder, silica micropowder and Guangxi white mud according to the mass ratio of 11:20:5:4, co-grinding to 200 meshes, and preparing the mixed powder with the sieving rate of more than 95 percent.
3) Crushing mullite aluminum titanate composite phase blank, mixing 60 mullite, mullite aluminum titanate composite phase and mixed powder according to the proportion shown in table 4, adding pulp waste liquid as a bonding agent, then stamping and forming under a 1000T press, finally preserving heat for 16h in a high-temperature tunnel kiln according to a 2 h/trolley system at 1550 ℃ and cooling according to the system, and repeating for 20 times under the water cooling condition at 1100 ℃ to observe the breakage condition of the material and detect the strength retention rate, wherein the detection result is shown in table 5.
Table 4 table 60 ratio of mullite, mullite aluminum titanate composite phase, mixed powder
TABLE 5 detection results of refractory materials for aluminum titanate-mullite high thermal shock kiln furniture
The detection result shows that: the synthesized mullite-aluminum titanate composite material is suitable for preparing high-temperature kiln furniture, and after ferric oxide is added, the kiln furniture refractory material sintered at 1550 ℃ has higher high-temperature flexural strength and good thermal shock resistance.
Claims (4)
1. The preparation method of the aluminum titanate-mullite refractory material for the high-thermal shock kiln furniture is characterized by comprising the following steps of,
1) Preparing mullite aluminum titanate composite phase blank: mixing and co-grinding 60 mullite, industrial aluminum titanate and iron oxide according to the mass ratio of 25:25:1, then stamping and forming under a 1000T press, finally preserving heat for 16h in a high-temperature tunnel kiln according to a 2 h/trolley system at 1550 ℃ and cooling according to the system to obtain the composite material;
2) Preparing mixed powder: mixing and co-grinding sillimanite, industrial alumina powder, silica micropowder and Guangxi white mud with the mass ratio of 11:20:5:4;
3) Crushing mullite aluminum titanate composite phase blank into blank aggregate, mixing according to the proportion of 25% of 1-3mm blank aggregate, 15% of 0-1mm blank aggregate, 20% of 1-3mm60 mullite aggregate and 40% of mixed powder, adding a bonding agent, then punching and forming under a 1000T press, and finally preserving heat for 16h at 1550 ℃ in a high-temperature tunnel kiln according to a 2 h/trolley system, and cooling according to the system to obtain the mullite aluminum titanate composite phase blank.
2. The method for preparing the refractory material for the aluminum titanate-mullite high-thermal shock kiln furniture according to claim 1, wherein in the step 1), 60 mullite, industrial aluminum titanate and ferric oxide are mixed and co-ground to 200 meshes, and the sieving rate is more than 95%.
3. The method for preparing the refractory material for aluminum titanate-mullite high thermal shock kiln furniture according to claim 1, wherein in the step 2), the sillimanite, the industrial alumina powder, the silica micropowder and the Guangxi white mud are mixed and co-ground to 200 meshes, and the sieving rate is more than 95%.
4. The method for preparing the refractory material for aluminum titanate-mullite high-thermal shock kiln furniture according to claim 1, wherein the binding agent is pulp waste liquid.
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| CN107619262A (en) * | 2017-08-01 | 2018-01-23 | 常州彤骉贸易有限公司 | A kind of Bone China and preparation method thereof |
| CN113149671A (en) * | 2021-03-24 | 2021-07-23 | 浙江吉昌新材料有限公司 | Casting molding process of light mullite-alumina hollow sphere-aluminum titanate sagger |
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