Graphite mixed sand
A technology of mixing sand and graphite, applied in casting molding equipment, molds, cores, etc., can solve the problems of reducing the permeability of graphite sand, unstable thermochemical properties of graphite sand, etc., and achieves a small thermal expansion coefficient and stable thermochemical properties. , the effect of high refractoriness
Inactive Publication Date: 2011-06-08
大连核心铸造技术工程研究所
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- Abstract
- Description
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Problems solved by technology
Although using bentonite as one of the raw materials of graphite sand can reduce the amount of binder used, it reduces the gas permeability of graphite sand and leads to unstable thermochemical properties of graphite sand
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0010] Embodiment one: a kind of graphite mixed sand, comprises amorphous graphite ore, and the weight ratio of each component of said graphite mixed sand is 40% amorphous graphite sand; 45% magnesia sand; 15% mullite sand. The particle size of amorphous graphite sand, magnesia sand and mullite sand should be 80 mesh.
Embodiment 2
[0011] Embodiment two: a kind of graphite mixed sand, comprise amorphous graphite ore, the weight ratio of each component of said graphite mixed sand is 50% amorphous graphite sand; 45% magnesia sand; 10% mullite sand. The particle size of amorphous graphite sand, magnesia sand and mullite sand should be 100 mesh.
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Abstract
The invention discloses graphite mixed sand, which comprises amorphous graphite ores. The graphite mixed sand is characterized by comprising the following components in percentage by weight: 40 to 45 percent of amorphous graphite sand, 30 to 45 percent of magnesium oxide sand, and 10 to 25 percent of mullite sand. The grain diameters of the amorphous graphite sand, the magnesium oxide sand and the mullite sand are generally between 80 and 120 meshes. The graphite mixed sand provided by the invention has small thermal expansion coefficient, high fire resistance, high hardness and stable thermo-chemical performance. The mullite sand for replacing bentonite is favorable for improving the air permeability of the graphite mixed sand. The graphite mixed sand product is mainly used for melted film casting, gypsum filler V method molding and vacuum suction casting, so that the internal crystalline phase tissues of the metal liquid are uniform during condensing, segregation and pores are not produced, and various mechanical properties of metal castings are improved.
Description
technical field [0001] The invention relates to a graphite mixed sand for casting, and the graphite mixed sand can be used as a raw sand material for preparing sand molds and sand core mixtures. Background technique [0002] In the prior art, the research on carbon sand has been mainly concentrated on man-made high-purity materials such as artificial coke and graphite, as described in British Patent 798249, U.S. Patent 2830342, and 2830913. Processing with petroleum residue Calcined fluidized coke sand with a fixed carbon content of more than 94% and its application in foundry production. The Frankfurt Armory in Philadelphia, the United States uses artificial electric furnace graphite powder with a purity of more than 98% as sand for magnesium-lithium alloy casting, and my country Dalian Shipyard uses high-purity artificial graphite scraps as core sand for large diesel engine cylinder liners. These materials not only have limited sources, but also are expensive, such as artif...
Claims
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IPC IPC(8): B22C1/00
Inventor 刘弘
Owner 大连核心铸造技术工程研究所
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