Preparation method for CuFe alloy powder for brake pad

Abstract

The invention discloses a preparation method for CuFe alloy powder for a brake pad. The preparation method is specifically performed according to the following steps that in percentage by weight, thecontent of Fe element in the CuFe alloy powder is adjusted, and the percentage content of the Fe element is made to be 5-30% of the whole CuFe alloy powder; a prepared alloy material is loaded into acrucible in a vacuum induction smelting furnace, a mechanical pump is started, a low-vacuum baffle valve is opened for vacuumizing, stage smelting is performed, and refining is performed for 1-2 min;molten alloy liquid is poured into a leakage ladle, in the process that the alloy liquid flows out through a leakage nozzle, spraying is performed when the pressure is controlled to be 0.5-10 MPa through gas compression, the spraying flow speed is controlled to be 4-20 L / min, the alloy liquid is dispersed into fine liquid drops, and cooling solidification is performed in the falling process; and then collecting the powder is just needed. The CuFe alloy powder prepared by the preparation method is spherical in morphology, the gas content of the powder is low, Fe phases in the powder are evenlydistributed in Cu particle collections, and the preparation method is suitable for being widely popularized.

Description

technical field [0001] The invention relates to the field of manufacturing nonferrous metal materials, in particular to a method for preparing CuFe alloy powder for brake pads. Background technique [0002] High-performance brake pads are the most direct, effective and simple way to increase braking force. At present, most high-performance brake pads use carbon fiber and metal materials as the main raw materials, and emphasize the environmentally friendly formula that does not contain asbestos. Most of the metal materials use steel elements, but the cost of steel elements is too high to be widely promoted. A wear-resistant and heat-resistant material to replace the steel element metal material. [0003] Since copper powder and iron powder are the two most used powders in powder metallurgy products, there are currently many brake pads made of semi-metallic materials containing iron and copper. The mixed use of powder and iron powder, the uneven mixing of the two and the lar...

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Problems solved by technology

[0003]Since copper powder and iron powder are the two most used powders in powder metallurgy products, there are currently more brake pads that use iron- and copper-containing semi- Metal material preparation, but because the traditional powder metallurgy products are prepared by mixing copper powder and iron powder, the mixing of the two is uneven, the melting temperature difference between the two is large, and the sintering temperature is difficult to determine, resulting in the quality and quality of the finished product. The performance is seriously affected; another production method of copper-iron composite powder is to use the diffusion method to mix the copper powder and iron powder evenly in a certain proportion, and then heat to a certain temperature so that the copper powder is coated on the surface of the iron powder particles. Since this method is a physical method to coat copper on the surface of iron powder particles, it also has many shortcomings.

[0004] And the tensile strength and Brinell hardness of the current copper-iron alloy cannot be directly used as the material of the brake pad, and the copper-iron alloy needs to be further enhanced Material properties

In response to the above problems, we prepared copper-iron alloy powders by smelting + atomization, which completely solved the problem of uneven mixing of the two powders and the difficulty of sintering

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