Method for manufacturing novel silicon carbide heat exchanger
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A manufacturing method and technology of silicon carbide are applied in the field of advanced ceramic materials to achieve the effects of reducing consumption, prolonging service life and improving high temperature resistance
Inactive Publication Date: 2010-12-15
武钢集团有限公司
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[0008] The purpose of the present invention is to overcome the shortcomings of existing metal heat exchangers and provide a heat exchanger with high strength, high hardness, high temperature resistance, corrosion resistance, good thermal shock resistance, large thermal conductivity and good oxidation resistance. New silicon carbide heat exchanger
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Embodiment 1
[0027] The weight percent of raw materials is 50% of silicon carbide, 30% of monocrystalline silicon, 14.7% of carbon black, 5% of polyvinyl alcohol and 0.3% of lanolin.
[0028] a, batching: prepare the raw material of aforementioned weight ratio;
[0029] b. Pulping: first add silicon carbide to distilled water, stir for 3 hours, then add elemental silicon and stir for 1 hour, then add carbon black and lanolin for stirring, then add polyvinyl alcohol solution dropwise, stir for no less than 7 hour, the slurry is evenly mixed into a paste;
[0030] c. Mold making: According to the size of the radiant tube, the physical shape is machined, and then the inner and outer molds are made;
[0031] d. Forming: grouting by solid grouting method;
[0032] e. Drying: After the molded body is demoulded, dry it in a drying room at 60°C for 72 hours;
[0033] f. Blank trimming: After the formed blank is dried, repair the defects on the surface of the blank;
[0034] g. Sintering: Put t...
Embodiment 2
[0038] The difference between the present embodiment and the first embodiment is that the weight percentage of raw materials is: 55% of silicon carbide, 25% of monocrystalline silicon, 15.7% of carbon black, 4% of polyvinyl alcohol, and 0.3% of lanolin. Other steps are the same as in Embodiment 1.
Embodiment 3
[0040] The difference between this embodiment and the first embodiment is that the weight percentage of each component is: 60% of silicon carbide, 20% of monocrystalline silicon, 16.7% of carbon black, 3% of polyvinyl alcohol with a pH value between 6.5 and 7.3, Lanolin 0.3%. Other steps are the same as in Embodiment 1.
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Abstract
The invention relates to a main heat exchange component in various high-temperature heat treatment furnace bodies such as a carburizing furnace, a fluorating furnace and the like in the field of steel manufacturing, in particular to a method for manufacturing a radiant tube with long service life and high temperature resistance. The method comprises the following steps of: A, mixing raw materialsin percentage by weight: 45 to 65 percent of silicon carbide, 20 to 30 percent of monocrystalline silicon, 10 to 20 percent of carbon black, 3 to 5 percent of polyving akohol and 0.3 percent of wool grease uniformly, and adding water to prepare paste; B, injecting the paste raw materials into a die for molding by adopting a solid slip casting method; C, demoulding a molded green body for drying; D, putting the dried green body into a vacuum furnace, raising the temperature to 180 DEG C, and performing vacuum reactive sintering to manufacture a main body of the silicon carbide heat exchanger; and E, sleeving the sintered main body of the heat exchanger outside a guiding pipe, and sleeving an outer pipe outside the main body of the heat exchanger. Products prepared by the method have the advantages of high strength and hardness, high temperature resistance, corrosion resistance, good thermal shock resistance and superior antioxidation performance.
Description
technical field [0001] The invention relates to a high-grade ceramic material, in particular to a heat exchanger applied to a heating furnace. Background technique [0002] The heating furnace part of the present invention originally used metal materials, and adopted a casting molding method. The heat exchanger produced had the following problems in the actual construction and use process: [0003] 1. The corrosion of the heat exchanger is relatively serious; [0004] 2. In the high temperature state, the strength of the heat exchanger is reduced, and it is easy to deform; [0005] 3. The gas medium will form scale on the inner wall of the heat exchanger, which will affect the effect of heat exchange; [0006] 4. Radiation tubes made of metal are heavy and require high support strength; [0007] 5. The service life is not long, and it is not resistant to high temperature, so it needs to be replaced frequently. Contents of the invention [0008] The purpose of the prese...
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