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Refractory material for surface layer of precision casting wax mold

A refractory material and wax mold technology, applied in the field of refractory materials, can solve the problems of poor natural high-grade ore, poor particle shape leveling, and large fluctuations in impurity content, achieving less sticky sand, small linear expansion coefficient, and fast drying speed Effect

Active Publication Date: 2020-11-17
梅河口市德成耐火材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of lack of natural high-grade ore used in refractory materials, large expansion coefficient of existing refractory materials, small thermal conductivity, low refractoriness, large fluctuations in impurity content, high low-melt content, poor particle shape leveling, The problem of high price of zircon sand, but to provide a refractory material

Method used

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  • Refractory material for surface layer of precision casting wax mold
  • Refractory material for surface layer of precision casting wax mold
  • Refractory material for surface layer of precision casting wax mold

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1 produces the electric arc furnace of the surface layer refractory material of precision casting wax mold

[0034] See Figure 9 , an electric arc furnace for producing surface refractory materials for precision casting wax molds, which includes: furnace, furnace lining, electrodes, arc starting rod 2, and arc starting coke 3;

[0035] The furnace bottom 4 is dish-shaped (circular area of ​​the furnace bottom electrode), the arc starting rod 2 is arranged in a star shape, the star point is the arc starting coke 3, and the other end of the arc starting rod 2 is connected with three electrodes (electrode A, electrode B, electrode C) phase connection; the arc starting rod 2 is a carbon rod, and the electrode is a graphite electrode.

Embodiment 2

[0036] The preparation of the surface layer refractory material of embodiment 2 precision casting wax mold

[0037] 1) Proportion: the raw material adopts Al with content ≥99% 2 o 3 (industrial alumina), 99% SiO 2 (vein quartz), content> 66% ZrO 2 (zircon sand); according to the mass fraction of raw materials Al 2 o 3 80%, SiO 2 15%, ZrO 2 5% for uniform mixing;

[0038] 2) Smelting: use an electric arc furnace for smelting. The smelting process is as follows: before starting the furnace, the electrode circle area of ​​the furnace bottom is repaired into a dish shape to facilitate the concentration of the molten liquid when the furnace is started; Corresponding to the star shape, place 1kg of carbon particles at the star point after the electrodes and carbon rods are compacted, and then put 200kg of alumina powder on the carbon particles to facilitate smooth melting into a melt after power transmission; when the current rises to normal After the value (1000kva transf...

Embodiment 3

[0045] The preparation of the surface layer refractory material of embodiment 3 precision casting wax mold

[0046] 1) Proportion: the raw material adopts Al with content ≥99% 2 o 3 (industrial alumina), 99% SiO 2 (vein quartz), content> 66% ZrO 2 (zircon sand); according to the mass fraction of raw materials Al 2 o 3 85%, SiO 2 11%, ZrO 2 4% for uniform mixing;

[0047]2) Smelting: use a dumping furnace for smelting. The smelting process is as follows: before starting the furnace, first repair the circle area of ​​the furnace bottom electrode into a dish shape to facilitate the concentration of the furnace melt; use three carbon rods to form a three-phase electrode at the bottom of the furnace. Corresponding to the star shape, place 1kg of carbon particles at the star point after the electrodes and carbon rods are compacted, and then put 200kg of alumina powder on the carbon particles to facilitate smooth melting into a melt after power transmission; when the current...

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Abstract

The invention discloses a refractory material for a surface layer of a precision casting wax mold. The material is prepared uniformly mixing, by mass, 75-85% of industrial aluminum oxide, 11-18% of vein quartz and 3-6% of zircon sand, smelting at 2100-2300 DEG C by adopting a three-phase star-shaped electric arc furnace, crushing and grinding. Due to reasonable design and proportioning, the main crystal phases comprise approximately granular corundum and mullite which is continuously distributed; the size of the corundum crystals is about 30-120 microns; besides the two main crystalline phases, a small amount of glass phase and a small amount of zirconium oxide are also included. Demolding is easy, adhesion is avoided, sand burning is little, and the finish degree of a precision casting product is guaranteed. The specific gravity is 3.10 g / cm<3>; the thermal conductivity is high, and the linear expansion coefficient is small and is 5*10<-6>; and deformation, cracks and cracking of theformwork are reduced.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a surface layer refractory material of precision casting wax molds. Background technique [0002] There are many kinds of refractory materials and different uses. It is necessary to scientifically classify refractory materials for scientific research, rational selection and management; there are many classification methods for refractory materials, which are classified according to chemical mineral composition: 1) silicon refractory materials; 2) Aluminum silicate refractories; 3) Magnesium refractories; 4) Dolomite refractories; 5) Carbon composite refractories; 6) Zirconium-containing refractories; 7) Special refractories; Larger, small thermal conductivity, low refractoriness, large fluctuations in impurity content, high low melting point, poor particle shape leveling, high price of zircon sand; [0003] At the beginning of the 20th century, refractor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3217C04B2235/3248C04B2235/3418C04B2235/77C04B2235/9607
Inventor 刘德成黄文博
Owner 梅河口市德成耐火材料有限公司
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