Aggregate type chromium oxide refractory material and preparation method thereof
A technology of refractory materials and chromium oxide, which is applied in the field of refractory materials, can solve the problems of poor thermal shock resistance and achieve good thermal shock resistance
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Embodiment 1
[0043] This embodiment provides an aggregate type chromium oxide refractory material and a preparation method thereof.
[0044] The raw material formula of the aggregate type chromium oxide refractory material is shown in Table 1.
[0045] The preparation method of the aggregate type chromium oxide refractory material comprises the following steps:
[0046] (1) Preparation of aggregate:
[0047] Taking materials according to Table 1, wherein: 93.5% of chromium oxide powder, 1.2% of silicon oxide powder, 4% of titanium dioxide powder, 0.8% of alumina powder, and 0.5% of zirconia powder; It is 1.5% of the total amount of chromium oxide powder, silicon oxide powder, titanium dioxide powder, alumina powder, and zirconia powder; the D50 of these selected powders is ≤ 20 μm;
[0048] These raw materials are mixed, dried, crushed, sieved, and isostatically pressed into blocks, and sent to the kiln for sintering; wherein, when the above-mentioned aggregate raw materials are fired, t...
Embodiment 2
[0058] This embodiment provides an aggregate type chromium oxide refractory material and a preparation method thereof.
[0059] The raw material formula of the aggregate type chromium oxide refractory material is shown in Table 1.
[0060] The preparation method of the aggregate type chromium oxide refractory material comprises the following steps:
[0061] (1) Preparation of aggregate:
[0062] Take materials according to Table 1, wherein: 89% of chromium oxide powder, 3% of silicon oxide powder, 5% of titanium dioxide powder, 2% of aluminum oxide powder, and 1% of zirconia powder; 1% of the total amount of chromium powder, silica powder, titanium dioxide powder, alumina powder, and zirconia powder; the D50 of these selected powders is ≤ 20 μm;
[0063] These raw materials are mixed, dried, crushed, sieved, and isostatically pressed into blocks, and sent to the kiln for sintering; wherein, when the above-mentioned aggregate raw materials are fired, the firing temperature is...
Embodiment 3
[0074] Embodiments 3 and 4 are all variations of Embodiment 1, and the change is only in the raw material formula (see Table 2), and the aggregate in Embodiment 3 is only the aggregate with a particle size of 0.074 to 0.5 mm. Embodiment 3 The aggregate in 4 is only selected with a particle size of 2.5-4mm.
[0075]
[0076] The obtained product of the embodiment of the present invention is adjustable according to the chemical composition of different needs: Cr 2 o 3 The content is 71~85%, ZrO 2 Content 3~15%, SiO 2 Content 2~6%, TiO 2 Content 2~6%, Al 2 o 3 Content 0~4%. The manufactured product has good thermal shock resistance, its apparent porosity is ≤20%, and its bulk density is ≥4.05g / cm 3 , up to 4.5g / cm 3 , cold compressive strength ≥ 90MPa.
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Abstract
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