High-temperature resisting foundry sand and preparation method thereof

Abstract

The invention aims to provide high-temperature resisting foundry sand. The high-temperature resisting foundry sand comprises the following components in parts by weight: 100 parts of bauxite by mass, 20-30 parts of zircon sand ores by mass, 10-20 parts of absorption fillers by mass, 10-30 parts of high-temperature fillers by mass, and 5-20 parts of polyborosiloxane by mass; and the prepared high-temperature resisting foundry sand is excellent in high-temperature resistance, is used for casting an alloy at a temperature of 2000-2500 DEG C, and obtains an excellent effect. The invention also aims to provide a preparation method of the high-temperature resisting foundry sand; and the preparation method comprises the following steps: (1) the fillers are pretreated; (2) a mixture after treatment in the step (1) and bauxite are put in a ball mill for mixing; (3) the mixture in the step (2) is put in a ball former; and a proper amount of water is added in the ball former to pelletize to obtain a ball-shaped blank; and (4) the ball-shaped blank in the step (3) is put in a graphite crucible for high-temperature sintering and cooling to obtain the high-temperature resisting foundry sand.

Description

technical field [0001] The present invention relates to a kind of foundry sand, more specifically, it relates to a kind of high temperature resistant foundry sand and its preparation method. Background technique [0002] Foundry sand refers to a molding material used to prepare molding sand and core sand in foundry production. In foundry production, the natural silica sand containing clay was mostly used in the early stage, which had good plasticity and was suitable for the conditions of manual production at that time; after entering industrial production, this silica sand containing silica was the most widely used and the most used. Foundry sand has a wide range of particle sizes and can be combined with various foundry binders. It is rich in resources and low in price. [0003] However, the uniformity of the performance of this natural silica sand is poor, and the quality of the molding sand is difficult to control; and the thermal expansion coefficient is relatively larg...

AI Technical Summary

Problems solved by technology

[0005] However, in the field of large-scale steel castings, ultra-high temperatures of 2000-2500 °C are often experienced, and neither the above-mentioned spinel casting sand nor the foundry sand of the prior art can meet such high-temperature requirements.

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