An increase in the hardness and wear resistance of WC-Co alloys with a decrease in the grain diameter of WC and Co makes it relevant to search for methods for producing powders with a maximum specific surface area (SSA). SSA growth is limited even when milling powders of WC and Co in the most high-energy mills. Effect of increasing the rotation speed of a planetary ball mill on the limiting value of the SSA of obtained nano sized WC and Co powders is studied. According to the developed model, an increase in the rotational speed of the mill leads to an increase in the limiting value of SSA if the cause is particle hardening. If the cause is coalescence, an increase in frequency leads to a decrease in the limiting value of the SSA. It was determined that the limiting value of SSA of WC particles increases from 1.0⋅10⁸ m²/m³ to 2.2⋅10⁸ m²/m³ (Sauter average diameter decreases from 60 to 27 nm) with increase of mill rotation frequencies from 2.5 to 4.2 rps due to a decrease in the volume of “indestructible” particles. And the limiting value of SSA of WC particles decreases from 2.2⋅10⁸ m²/m³ to 1.1⋅10⁸ m²/m³ (Sauter average diameter increases from 26 to 55 nm) with increase of mill rotation frequencies from 5 to 6.7 rps due to the increase of the coalescence rate. The experiment showed that the limiting value of SSA for Co powder decreases from 1.0⋅10⁸ m²/m³ to 1.1⋅10⁶ m²/m³ with increasing of the rotational speed of the mill from 2.5 rps to 6.7 rps (Sauter average diameter increases from 60 to 5450 nm) due to the increase of the coalescence rate. Studies have shown that the growth of SSA of WC grains is limited by a certain value (11.5 nm).

WC-Co合金硬度和耐磨性的提高，以及WC和Co晶粒直径的减小，使得寻找生产具有最大比表面积（SSA）的粉末的方法变得有意义。即使在大多数高能磨中研磨WC和Co的粉末，SSA的增长也受到限制。研究了提高行星式球磨机转速对所得纳米级WC和Co粉的SSA极限值的影响。根据开发的模型，如果原因是颗粒硬化，则磨机转速的增加会导致SSA极限值的增加。如果原因是合并，则频率增加会导致SSA极限值减小。经测定，WC的SSA的限制值从1.0⋅10颗粒增加⁸米² /米³至2.2⋅10 ⁸米² /米³与从2.5到4.2 RPS立铣刀旋转频率的增加，因为在“不可破坏”颗粒的体积的降低（索特平均直径为60至27纳米的降低）。和SSA的WC粒子的限制值减小从2.2⋅10 ⁸米² /米³至1.1⋅10 ⁸米² /米³与立铣刀旋转频率的增加，从5到（索特平均直径增大从26至55纳米）由于合并速率的增加，达到6.7 rps。实验表明，SSA为Co粉末的限制值从1.0⋅10减小⁸米² /米³至1.1⋅10 ⁶米² /米³与来自2.5 RPS（60至5450纳米的平均索特直径增加），由于聚结速率的增加磨机的旋转速度的增加至6.7的RP。研究表明，WC晶粒的SSA的生长受到一定值（11.5 nm）的限制。