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首先将商品硅锰(Si 含量14—25%)和低碳锰铁配制成含硅3—26%的锰合金(在此含硅量范围内,随着含硅量增加氮化温度上升,且含氮量随之增加)。然后球磨粉碎。其粒度在100—300目为最好。因为,太粗则渗氮慢;太细(如400目以上)则破碎时表面容易形成氧化膜,妨碍渗氮。把这些粉末加热并通入氮气进行渗氮。渗氮的温度最好低于氮化物分解的温度。但是,如果低于700℃则渗氮的速度变慢,且与合金中的含硅量无关;如果高于1400℃,则会产生夹杂。所以应控制在700—1400℃,最好在800
First, commercially available silicomanganese (Si content 14-25%) and low carbon ferromanganese were formulated into a manganese alloy containing 3-26% silicon (within this range of silicon content, the nitridation temperature rises as the silicon content increases, and Nitrogen content increases). Then ball mill crushed. The particle size of 100-300 mesh is the best. Because, too coarse, nitriding slow; too fine (such as 400 above) is broken when the surface is easy to form oxide film, preventing nitriding. The powder is heated and nitrogen is introduced for nitriding. The nitriding temperature is preferably lower than the temperature at which the nitride decomposes. However, if it is lower than 700 ° C, nitriding becomes slower and does not depend on the amount of silicon in the alloy; if it is higher than 1400 ° C, inclusions occur. So should be controlled at 700-1400 ℃, preferably at 800