シリンダライナ用鋳鉄の摩耗に関する研究

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The performance of a motor cycle engine has been improved rapidly. Therefore it has been increasingly required to develop the new casting material for cylinder liner which possesses a better wear resistance. From such a viewpoint, we coated preliminarily the manganese phosphate on the cylinder liner surface made with cast iron in an attempt to improve its wear resistance. It is generally known that this treatment has a significant anticorrosive effect and to improve the wear resistance in application to various machine elements, for instance, a cam, a shaft and so on. This treatment consists of Fe(H_2PO_4) and crystal Mn(H_2PO_4), and the surface characteristic of this treatment is considerably porous. In the present work, we added copper ion to such a treatment liquid of Mn(H_2PO_4) so that we could get metallic copper precipitated on the porous surface of crystal Mn(H_2PO_4). As a result, this surface was smoothened and the surface characteristic changed better. First, we conducted a friction test of cast Iron whose surface was previously treated in the above mentioned fashion using a oscillating friction and wear testing machine. Second, we performed the substance wear test of the cylinder liner treated similarly for a two-cycle engine. Main conclusion can be summarized as follows. As the effect of chemical coat, it is found that manganese phosphate coat treatment reduces the friction coefficient if compared with no treatment. The seizure phenomenon was observed in some materials with manganese phosphate coat, while no seizure phenomenon occured with new coat investigated and also the same result was obtained in the substance wear test. As a conclusion, the chemical coat with precipitated metallic copper investigated was found to improve the wear resistance clearly.
湘南工科大学の論文
1989-03-25

シリンダライナ用鋳鉄の摩耗に関する研究

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