Composite combining corundum based refractory materials
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A refractory material and sintered corundum technology, which is applied in the field of corundum high-grade refractory materials, can solve problems such as limiting the high temperature resistance of materials, and achieve good physical properties
Active Publication Date: 2009-05-06
RUITAI MATERIALS TECHNOLOGY CO LTD
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Problems solved by technology
However, barium feldspar-bonded refractory materials still need to use a large amo...
Method used
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Embodiment 1
[0028] 3-1mm corundum 52%, 1-0.088mm corundum 20%, 0.088mm corundum 18%, 0.002mm alumina powder 4.5%, barium aluminate cement 1%, silica fume (silica content 98%) 0.5%, can 4% aluminum oxide hydrate, 0.1% polycarboxylate superplasticizer, 3% polyacrylic acid emulsion, and 3% water are added to obtain a slurry with good fluidity. After forming, the slurry coagulates in 0.5 hours, solidifies in 1 hour, and can be demolded after 6 hours. After drying at 110℃×24H, the sample obtained a flexural strength of 11MPa and a compressive strength of 50MPa. After heat treatment at 1100°C for 3 hours, a flexural strength of 15MPa and a compressive strength of 53MPa are obtained, and the change in firing line is 0.0%. After heat treatment at 1500°C for 3 hours, a flexural strength of 17MPa, a compressive strength of 73MPa, a firing line change of -0.1%, and a softening temperature under load T0.6 = 1630°C.
Embodiment 2
[0030] 3-1mm alumina hollow ball 32%, 1-0.088mm alumina hollow ball 10%, 0.088mm corundum 37%, 0.002mm alumina micropowder 10%, barium aluminate cement 2%, silica fume (silica content 98 %) 1%, hydratable alumina 8%, plus 0.2% polycarboxylate superplasticizer, polyacrylic acid emulsion 6%, water 6% After forming, it can be quickly released from the mold, after stagnation, drying, 1550 ° C × 3 hours After sintering, a material with a bulk density of 1.5g / cm3, a compressive strength of 21MPa, and a load softening temperature of T0.6=1620°C was obtained. This material can be used as special shape heat insulation refractory material.
[0031] The invention has the coagulation, hardening, demoulding, drying and heating properties significantly similar to low-cement castables, and also has good high temperature resistance, and can be made into various products or used as an unshaped material.
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Abstract
The invention relates to a composite sialon-corundum fire-resisting material, which is characterized in that the formulation of the fire-resisting material comprises the following: 30 to 54 percent of corundum or aluminum oxide hollow sphere the diameter of which is between 3 and 1 millimeter, 7 to 30 percent of the corundum or the aluminum oxide hollow sphere the diameter of which is between 1 and 0.0088 milliliter, 16 to 30 percent of corundum powder the diameter d90 of which is less than 0.088 millimeter, 3 to 10 percent of alpha aluminum oxide micro powder, 2 to 8 percent of hydrated aluminum oxide, 0.2 to 2 percent of siliceous dust, 0 to 2 percent of barium aluminate cement, 0.05 to 0.4 percent of efficient water reducing agent (which is prepared from polycarboxylic acid, sulfonated naphthaldehyde polymer and sulfonated melamine polymer), 1 to 6 percent of polyacrylic acid emulsion, and 1 to 6 percent of water. The composite sialon-corundum fire-resisting material obviously has the advantages of coagulation, hardening, demolding, drying and heating performances remarkably similar to a low cement casting material, and good high-temperature resistant performance, and can be made into various products or be used as an unshaped material.
Description
technical field [0001] The invention relates to a high-grade corundum refractory material, which has the advantages of good high temperature resistance, strong thermal shock resistance, wide sintering temperature range, and is convenient for manufacturing into large-scale and special-shaped products. It is suitable for kiln furniture and other new-type high-temperature kiln equipment. Refractory materials are used. Background technique [0002] Generally, corundum refractory materials are used to build high-temperature kilns. With the increase of energy prices, high-temperature kilns have more energy-saving and fast-firing features. For enhanced insulation, the kiln car or kiln lining can use hollow or concave bricks filled with lightweight materials. In order to reduce heat absorption, the kiln furniture can also be hollow. Also, a pusher kiln can be used instead of a tunnel kiln. In these occasions, it is necessary to use materials with good high temperature resistance...
Claims
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