Graphite ring for continuous lubrication crystallizer and manufacturing method thereof
A manufacturing method and a graphite ring technology are applied in the field of semi-continuous casting molds of aluminum and aluminum alloys, which can solve the problems of poor self-lubricating effect of graphite, difficulty in meeting lubrication requirements, and aluminum hanging on the surface of ingots, and improve the quality of internal structure, Good thermal insulation and continuous lubrication, eliminating the effect of hanging aluminum
Active Publication Date: 2011-12-28
CHINALCO MATERIALS APPL RES INST CO LTD
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Problems solved by technology
[0002] At present, aluminum and aluminum alloy semi-continuous casting molds generally adopt graphite sleeve self-lubrication and lubricating oil, which can reduce the friction between the aluminum alloy melt and the mold during the casting process, and can play a role Certain lubricating effect, but the self-lubricating effect of graphite is poor, it is difficult to meet the lubrication requirements of the casting process, resulting in serious problems such as aluminum hanging on the surface of the ingot, stretch marks, cold shut, rough surface, segregated layer thickness, uneven structure, etc.; Really achieve a good continuous lubrication function, and there is no effective measure to reduce the primary cooling
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[0017] The invention provides a graphite ring for a continuous lubricating crystallizer and a manufacturing method thereof. The components of the graphite ring include graphite powder and asphalt powder. During preparation, the graphite powder and the asphalt powder are uniformly mixed in a mass percentage of 1:1 to 10:1 , pressed into a compact, then put the compact into an isostatic sintering furnace for roasting, fill it with argon gas, the pressure of the argon gas is 200-1000 MPa, the temperature is 800-3000 °C, heat preservation and pressure for 10-60 hours, and cool with the furnace , Machined into pieces. Physical and chemical indicators of graphite ring: average particle size 12-18μm, density 1.6-1.8g / cm 2 , porosity 12~18Vol.%, average pore diameter 1~3μm, permeability 0.05~0.3cm 2 / s, Rockwell hardness 70~90, resistance 10~14μΩm, bending strength 40~50N / mm 2 , compressive strength 80~95N / mm 2 , Young's modulus 9.5×10 3 ~11.5×10 3 N / mm 2 , thermal expansion 2.5...
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Abstract
The invention provides a graphite ring for a continuous lubricating crystallizer and a manufacturing method thereof. The components of the graphite ring include graphite powder and asphalt powder. During preparation, the graphite powder and the asphalt powder are first mixed in a mass percentage of 1:1 to 10:1 Uniform, pressed into a blank; then put the blank into an isostatic sintering furnace for roasting, fill it with argon, the argon pressure is 200-1000MPa, the roasting temperature is 800-3000°C, heat preservation and pressure for 10-60h, after roasting The furnace is cooled and then machined into pieces. Using graphite powder and pitch powder, isostatic pressing high temperature sintering to prepare blanks, machined into pieces, has the advantage of isotropy, stable chemical and physical properties of graphite rings, high thermal conductivity, good dimensional stability, high permeability, suitable for aluminum And aluminum alloy semi-continuous casting crystallizer.
Description
technical field [0001] The invention relates to a graphite ring for a continuous lubricating crystallizer and a manufacturing method thereof, which are applied to semi-continuous casting crystallizers of aluminum and aluminum alloys. Background technique [0002] At present, aluminum and aluminum alloy semi-continuous casting molds generally adopt graphite sleeve self-lubrication and lubricating oil, which can reduce the friction between the aluminum alloy melt and the mold during the casting process, and can play a role Certain lubricating effect, but the self-lubricating effect of graphite is poor, it is difficult to meet the lubrication requirements of the casting process, resulting in serious problems such as aluminum hanging on the surface of the ingot, stretch marks, cold shut, rough surface, segregated layer thickness, uneven structure; Really achieve good continuous lubrication function, and at the same time there is no effective measure to reduce the primary cooling...
Claims
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IPC IPC(8): B22D11/07C01B31/04
Inventor 张建平乐永康毛建伟
Owner CHINALCO MATERIALS APPL RES INST CO LTD