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采用自制电阻式粉末温压系统研究了铁基粉末的温压行为,对铁基粉末在温压过程中的加热温度与粉末流动性关系、加热方式与粉末冶金制品密度关系及模具温度与压坯硬度关系进行了研究。实验结果表明:粉末在合适的温度及压制力即粉末温度在(85±5)℃温度范围,模具外壁温度在135℃(内壁温度为115℃),压制力为700~750 MPa时,所得到的粉末压坯密度最大,且此时测出其脱模力亦较小,粉末压坯硬度值较大;润滑剂在压制过程中能够有效降低颗粒间以及粉末与模具间摩擦力,使实际作用在粉末上的作用力增大,有效提高了制品致密化程度。
The temperature-pressure behavior of iron-based powder was studied by using the self-made resistive powder thermo-compression system. The relationship between heating temperature and powder fluidity during heating and pressing of iron-based powder, the relationship between heating method and powder metallurgy product density, The relationship between hardness was studied. The experimental results show that when the powder temperature is within the range of (85 ± 5) ℃ and the temperature of the mold is 135 ℃ (inner wall temperature is 115 ℃) and the pressing force is 700 ~ 750 MPa, Of the maximum density of the powder compact, and measured at this time its release force is smaller, the hardness of the powder compact larger; lubricant in the compression process can effectively reduce the friction between the particles and the powder and the mold, so that the actual role The force on the powder increases, effectively improving the degree of product densification.