セラミックス工具を用いた等温鍛造に関する研究 : BN/ほう酸混合潤滑剤の摩擦特性

概要

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The authors have found that a lubricant which consists of boron nitride and boric acid (BN/BA lubricant) shows a very low coefficient of friction in isothermal forging of a Ti alloy with ceramic tools, i. e., AL_2O_3, SiC, Si_3N_4. To apply the developed lubricant to a practical forming operation effectively, frictional characteristics of the BN/BA lubricant are investigated in detail by carrying out ring-compression tests. The coefficient of friction is kept very low when the weight fraction of boron nitride is in the range of 20 to 40% for every ceramic tool, and is reduced with an increase in strain rate. The temperatures at which the BN/BA lubricant exhibits excellent frictional characteristics coincide with the temperatures at which superplastic property appears in the Tialloy and Ni base superalloy. It is concluded that thick lubricant film entrapped between the tool and the specimen reduces the friction in isothermal forging with BN/BA lubricant
一般社団法人日本機械学会の論文
1989-08-25