Ceramic for heat-resistant cutting tool and preparation method thereof

Abstract

The invention relates to a heat-resistant ceramic for cutting tools, which is prepared from the following raw materials in parts by weight: 4-5 parts of tungsten oxide fiber, 13-16 parts of heavy-burned magnesia, 6-8 parts of light-calcined magnesium oxide, 5-7 polyhydroxyl-aluminum pillared bentonite, 1-2 parts of sodium carboxymethyl cellulose, 24-28 parts of TiB2, 36-42 parts of ZrB2, 34-39 parts of AlN, 2-3 parts of TiCl4, a right amount of ethanol, a right amount of deionized water, 1-1.5 parts of polyacrylic acid, 1.2-1.6 parts of polyethyleneglycol and 4-5 parts of antiwear assistant. The tungsten oxide fiber is added to enhance the heat resistance and toughness of the ceramic. By adding the TiB2, ZrB2 and AlN, the ceramic has superhigh strength and hardness, and the prepared cutting tool is durable and can be used for cutting, grinding and other working processes. The antiwear assistant can enhance the wear resistance and heat resistance of the ceramic.

Description

technical field [0001] The invention relates to the field of ceramic tool materials, in particular to a ceramic for heat-resistant cutting tools and a preparation method thereof. Background technique [0002] At present, carbide-based cemented carbide (WC-Co, WC-TiC-Co) is widely used in cutting steel, cast iron, alloy steel and stainless steel. For some special materials, diamond and cubic boron nitride (CBN) with the highest hardness are also used, but their strength is lower than that of cemented carbide, and diamond tools are not conducive to cutting steel materials, because diamonds with carbonaceous elements are easily combined with iron elements. The reaction produces iron carbide, which causes diamond loss. The ceramic tool does not react to many materials such as iron-based, and has better performance for processing chilled cast iron, Stellite alloy, heat-resistant nickel-based alloy, etc. [0003] At present, ceramic knives have many excellent properties, such as...

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Problems solved by technology

[0003] At present, ceramic knives have many excellent properties, such as high hardness, high density, high temperature resistance, anti-magnetization, anti-oxidation, strong corrosion resistance, good chemical stability, high wear resistance, etc., but the cost of these ceramics is relatively high. However, it is necessary to further study new ceramic materials to reduce costs and improve the performance of ceramic tools such as toughness, heat dissipation, bending resistance, and wear resistance.