Method for preparing composite material combined with corundum based on bauxite beta-Sialon
A composite material and corundum technology, which is applied in the field of refractory product manufacturing of inorganic compounds, can solve the problems that special refractory materials cannot be satisfied, the weight of raw materials is not stable enough, and the composition is not uniform enough, etc. simple effect
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Embodiment 1
[0037] Raw materials: high alumina bauxite (composition as shown in Table 1), Si, Al, corundum particles and fine powder (particle size composition as shown in Table 2).
[0038] Table 1 Chemical composition of high alumina bauxite (after burning)
[0039] Component
Al 2 O 3
SiO 2
Fe 2 O 3
TiO 2
wt%
86.66
5.39
2.15
4.26
[0040] Table 2 Particle size composition of corundum particles and fine powder
[0041]
Component
Al 2 O 3
Coarse grain
Medium particle
mm
3-1
1-0.088
＜0.088
[0042] According to parts by weight, put 8 parts of high alumina bauxite, 11 parts of metal silicon powder, 1 part of metal aluminum powder, and 25 parts of corundum powder in a ball mill tank, and dry and mix uniformly to obtain a mixed powder; sequentially add 45 parts of corundum Coarse particles, 10 parts of medium particles and mixed powder are adde...
Embodiment 2
[0047] The raw materials used are the same as in Example 1.
[0048] According to parts by weight, put 6 parts of high alumina bauxite, 8 parts of metal silicon powder, 1 part of metal aluminum powder, and 30 parts of corundum powder in a ball mill tank, and dry and mix uniformly to obtain a mixed powder; sequentially add 45 parts of corundum Coarse particles, 10 parts of medium particles and mixed powder are added to a mixer, 5% of the weight of the mixed resin is used as a binder, added and mixed, pressed into a block with a 100MPa machine, and dried at a temperature of 80-110°C.
[0049] Put the above-mentioned shaped block into an atmosphere sintering furnace, under a nitrogen atmosphere, heat up to 820°C at a rate of 150°C / hour and keep it for 1 hour; then continue to heat up to 1070°C at a rate of 80°C / hour and keep it for 2 hours; Continue to heat up to 1260°C, at a heating rate of 20°C / hour, and hold for 8 hours; finally, heat up to 1450°C, at a heating rate of 130°C / hour,...
Embodiment 3
[0053] The raw materials used are the same as in Example 1.
[0054] According to parts by weight, put 10 parts of high alumina bauxite, 13 parts of metal silicon powder, 2 parts of metal aluminum powder, and 20 parts of corundum fine powder in a ball mill tank, and dry and mix uniformly to obtain a mixed powder; sequentially add 45 parts of corundum Coarse particles, 10 parts of medium particles and mixed powder are added to a mixer, with 3% dextrin by weight of the mixture as a binder, added and mixed, pressed into a block with a 100MPa machine, and dried at a temperature of 80-110°C.
[0055] Put the above-mentioned shaped block material into an atmosphere sintering furnace, in a nitrogen atmosphere, heat up to 870°C at a rate of 180°C / hour and keep it for 1 hour; then continue to heat up to 1060°C at a rate of 60°C / hour and keep it for 2 hours; Continue to heat up to 1300°C, at a heating rate of 50°C / hour, and hold for 8 hours; finally, heat up to 1550°C, at a heating rate of ...
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