Selection of Composition of Powder Metallurgy Materials

Release time:

2021-05-19 13:17

Generalpowder metallurgyThe friction material is a multi-component composite material composed of a metal matrix, a friction component and a lubricating component. Among them, the main function of the metal matrix is to accommodate the ceramic component and the lubricant therein through mechanical combination to form a whole with a certain strength. The matrix is metal, and its microstructure and physical and chemical properties largely determine the friction and wear properties, thermal stability, mechanical properties and thermal conductivity of powder metallurgy parts.

powder metallurgyThe matrix composition of the material usually adds a certain amount of alloying elements, such as copper, tungsten, nickel, phosphorus, chromium, molybdenum and silicon, to the iron-based matrix to improve the performance of the matrix. The added alloying elements will interact withFe forms alloy pearlite, forming carbide phase or intermetallic compound phase, thereby improving the high temperature strength and oxidation resistance of the matrix, and greatly reducing the wear of the material.

Add to copper basepowder metallurgyThe alloying elements in the brake material matrix include zinc, nickel, aluminum, titanium, molybdenum and tin. The friction components commonly used in friction materials are silica, alumina, silicon carbide,B4C, etc. The main purpose of adding friction components is to improve the friction coefficient of the matrix material and enhance the strength of the matrix.

It is generally believed that the addition of silica as a friction agent in copper-based friction materials is more suitable.SiO 2 can increase the friction coefficient and reduce wear. However, some studies have shown that silica is reduced and dissolved in iron, resulting in a decrease in iron carbide content, thereby reducing friction performance.

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