ホウ酸, ホウ酸カリウムによる銅の浸せきホウ化処理
スポンサーリンク
概要
- 論文の詳細を見る
Boronizing of steels has an advantage over carburizing or nitriding in being able to get harder surface of steels. Besides, boronizing is easier in treatments and does not require special equipments. Usually, as a main salt composition for immersion boronizing of steels, B_4C, Na_2B_4O_7・10H_2O, Fe-B, KBF_4, CaB_0 or BN among others bas been used. This paper describes the immersion boronizing which utilizes relatively inexpensive boric acid and potassium borate as major salt compositions and magnesium powder as a reducing agent. The results obtained were as follows: (1) A favorable boride layer was obtained by using magnesium powder as a reducing agent and boric acid and potassium borate as sources of boron supply. From the view point of economical efficiency in boronizing of steels, the best condition for boronizing was composed with H_3BO_3 : 40 wt%, K_2B_4O_7・5H_2O : 20 wt%, NaF : 15 wt%, K_2CO_3 : 15 wt% and Mg powder : 10 wt%. (2) In these experiments, the treatment for boronizing at 700℃ did not yield any boride layer on steel, but the treatment above 750℃ could yield boride layer. The satisfactory temperature for boronizing of steel was 900℃. (3) The composition of the boride layer was only Fe_2B. (4) The microhardness of boride layer was from 1200 to 1800 for H_V (0.1 kg). (5) With increasing viscosity of salt, the thickness of boride layer tended to become more uneven. (6) The effect of the material of crucibles on the thickness of boride layer was not so noticeable for corundom and stainless steel crucibles. (7) In the case of carbon steels, the thickness of boride layer decreased slightly with increasing carbon content in steels.
- 1976-04-15
著者
関連論文
- ほう化処理した鋼の高温酸化について
- ほう化処理鋼すべり摩耗痕の観察について
- ほう化処理鋼すべり摩耗痕の観察について
- ほう化処理した鋼のすべり摩耗特性について
- ホウ酸, ホウ酸カリウムによる銅の浸せきホウ化処理
- ほう化処理を施した引き抜きダイスの耐摩耗性
- ホウ化処理した鋼の耐食性について