High-aluminum prefabricated part toughened by in-situ generated SiC and preparation method thereof
A technology for in-situ generation and prefabrication, used in the field of refractory materials
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Embodiment 1
[0027] Example 1: A high-alumina preform toughened by in-situ generation of SiC and its preparation method
[0028] a. Raw material composition: expressed in weight percentage, high alumina bauxite 87%, elemental silicon 3%, binder 10%; plus an inorganic dispersant accounting for 0.3% of the total weight of the above raw materials, the inorganic dispersant is sodium tripolyphosphate or Hexametaphosphate.
[0029] Al in the high alumina bauxite 2 o 3 Content ≥ 75%; 87% of high-bauxite includes 20% of high-bauxite with 5mm < particle size ≤ 8mm, 12% of high-bauxite with 3mm < particle size ≤ 5mm, 16 high-bauxite with 1mm < particle size ≤ 3mm 18%, 180 mesh high alumina bauxite 12%, and 320 mesh high alumina bauxite 9%, 0.1mm<grain size≤1mm; Si content in elemental silicon ≥98%, particle size 150 mesh; binder Calcium aluminate cement 4%, silica fume 6%;
[0030] b. Take various raw materials and dry mix them evenly with a mixer to obtain dry mixed materials;
[0031] c. Add ...
Embodiment 2
[0034] Embodiment 2: basically the same as Embodiment 1, the difference is:
[0035] Step a: The raw materials are 81% high alumina bauxite, 9% elemental silicon, 10% binder, plus an organic dispersant accounting for 0.2% of the total weight of the above raw materials; the organic dispersant is a fatty acid dispersant.
[0036] Al in high alumina bauxite 2 o 3 Content ≥ 75%; 81% high bauxite includes: 18% high bauxite with 5mm < particle size ≤ 8mm, 17% high bauxite with 3mm < particle size ≤ 5mm, high bauxite with 1mm < particle size ≤ 3mm 13%, 20% of bauxite with 0.1mm<grain size≤1mm, 8% of bauxite with 180 mesh and 5% with bauxite with 320 mesh; ; Calcium aluminate cement 5% and silica fume 5% in the binder;
[0037] Step d: put the naturally cured prefab into a baking kiln for baking, the baking temperature is 100°C, and the baking time is 36 hours;
[0038] Step e: put the baked preform into the sagger, the top of the preform is covered with a coke layer formed by cok...
Embodiment 3
[0039] Embodiment 3: basically the same as Embodiment 1, the difference is:
[0040] Step a: 90% high-alumina bauxite raw material, 4% elemental silicon, 6% binder, plus an inorganic dispersant magnesium phosphate accounting for 0.4% of the total weight of the above-mentioned raw materials;
[0041] Al in the high alumina bauxite 2 o 3 90% high-bauxite includes: 25% high-bauxite with 5mm
[0042] The Si content in the elemental silicon is ≥ 98%, and the particle size is a mixture of 150 mesh and 200 mesh elemental silicon, and the mixing ratio of the two is 1:1;
[0043] In the binder, calcium aluminate cement 3%, silica fume 3%;
[0044] Step d: put the naturally cured prefab into a baking kiln for baking, the baking temperature is 120°C, and the baking time is 24 hours;
[0045] S...
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