Brake friction materials must be strong enough to absorb driving shock, yet soft enough so as not to damage disks or drums. It is very difficult to strike this balance. A semi-metallic substance that can dissipate the heat produced by brakes is the ideal material. This will protect the disc, and prolong the component's life. Natural amorphous Graphite is the most durable and effective of all these materials. Historically, this was the material used for most brake linings. Most manufacturers, though, have switched over to nonasbestos-organic (NAO), compositions since the asbestos crises. This has significantly reduced the demand of graphite for brake linings. A number of brake lining factories have also closed down, which has resulted in a further reduction in natural graphite usage in this application.
An alternative, calcined carbon anthracite graphite to the natural amorphous type of graphite. Carbon additives are produced when anthracite coke is heated at very high temperatures. In steel manufacturing and the production of carbon electrodes, it is used. Also, it can be used to reduce costs and increase efficiency by replacing coke. Calcined anthracite is available in two forms: gas calcined and electrically calcined.
Anthracite gas calcined is the form most commonly found. It is used for steel making and in carbon electrodes. Anthracite that has been electrically calcined is gaining popularity due to the superior properties of this product and its use in aluminum-based metalurgical processes. The two forms of anthracite are both suitable for industrial purposes because they have high carbon contents and few impurities.
This invention describes a process for manufacturing automotive friction by using high-sulfur, anthracite. After selecting high sulfur hard coal as raw coal, it is floated until a low volatile material slag is obtained. Then, raw coal in a particular ratio is added to other friction materials (4:23-3;22).
The friction material will be formed as a result of the combination of tackiness agent (agent), matrix and strengthening agent (agent) and lubricant. The final friction materials are composed of the following: matrix and strengthening agent 40-60; abrasive 15-20; lubricant, and filler (10-20). The high-sulfur resource of anthracite can be fully utilized in this way. The friction materials that resulted meet the standards of national regulation and are more suitable for use than conventional processing techniques. The deep processing technology and the utilization of anthracite is significant. This invention improves the efficiency and quality of friction materials used in automotive applications, and reduces costs. This is a great benefit for consumers and the economy.
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