FT-3500粉体压缩强度测试

T-3500粉体压缩强度测试仪

FT-3500 Powder compression strength tester

1.   原理和理论Principle and theory：

颗粒在压缩时要经历初步压缩、颗粒重排、初始结构形成、弹性形变、塑性形变、颗粒破碎、结合键形成、进一步压实及去除压力后的弹性恢复等系列变化，颗粒结构被破坏并发生重组形成新的结合键及压缩体；通过对粉体施加屈服强度变形所需的主应力，来分析粉体的体积、空隙率，压缩度与屈服强度关系即（主应力与粉体密度的变化关系），采用经验方程法：Heckel、Kawakita、Adams方程及川北方程线性回归方程的压缩理论来分析粉体颗粒新品、研发固体产品比如在药物处方及工艺选择方面及压实密度对压力的要求等的预测性分析工具.

本机型还可以实现粉体电阻、电阻率、电导率的测量（导体粉末），可通过粉体压缩与阻抗的变化关系或者粉末体压缩过程中的静电测量（绝缘粉体颗粒）.通过电性能的变化来判断粉体压缩特性.

 During compression , particle need undergo preliminary compression, particle rearrangement, the initial structure formation, elastic deformation, plastic deformation and grain crushing, combined with the key form, further compaction and of elasticity after removal the stress and so on series of change, such as granular structure destruction and restructuring to form a new bonding and compressed; By applying the principal stress to the deformation of the powder to analyze The volume change of the powder body and the pressure relation,(namely The relationship between primary stress and powder density), the relation between time and yield strength, yield strength and compression height change relations, using  the empirical equation method: Heckel, Kawakita, Adams equations and the compression theory of Kawakita’s Equation of linear regression equation  to analyze the new powder particles, research and development of solid products such as  predictive analysis tools in  drug prescription and process selection and Compaction density is required for pressure etc.

This model can realize measurement of  powder resistance, resistivity, conductivity( conductor powder),Judging   powder’s compression feature through the change of relationship between compression and impedance  or    powder body ‘s electrostatic measurement  In the process of powder compression.   (insulation powder particles).

二、目前比较认可的压缩成形机理At present, recognized mechanism of compression forming is：

认为粒子受压时，粒子间距离很近，从而在粒子间产生范德华力，静电力等的引力；粒子受压时，其塑性形变使粒子间的接触面积增大；粒子受压破碎时，产生的新生表面有较大表面自由能；粒子受压变形时，粒子相互嵌合而产生的机械结合力；粒子受压时，由于摩擦力而产生的热，特别是颗粒间支撑点处局部温度较高，使熔点较低的物料部分地熔融，解除压力后重新固化而在粒子间形成 “固体桥”； 在水溶性粒子的接触点处析出结晶而形成的 “固体桥”.

 The distance between the particles are very close when pressure apply on the particles, Thus create the van der Waals force, the electrostatic force and so on;When a particle is pressed, its plastic deformation increases the area of contact between particles.When the particle is crushed, the resulting surface has a greater surface free energy When the particles are compressed, the mechanical force of the particles is combined.Particles compression, heat generated by friction, especially  the local temperature of the interparticle support point between particles is higher, make the lower melting point material parts melt,  After relieve pressure ,curing in between particles to form the “solid bridge “;  At the contact point water-soluble particle precipitation crystallization and form of “solid bridge”

三、功能介绍Function introduction：

采用液压恒压加压测量系统，7寸触摸屏控制，高精度荷重单元控制系统能精确采集应力变化数据，可以任意设置压力、时间数据，位移数据由位移传感器直读，温湿度数据通过传感器获得，多位数的AD芯片来保障数据的分析，全自动模式，手动操作模式并存；配置PC软件可以获得应力与粉体密度关系；方程线性变化关系过程数据的分析和曲线图谱，为生产企业和科研院所研发新品和改善工艺建立数据模型.

 Adopts hydraulic constant pressure pressing measurement system, 7 inch touch screen control, high precision load cell stress change control system can precisely collect data, the data can be arbitrarily set pressure, time, displacement direct reading data by displacement sensor, the temperature and humidity data obtained from the sensor, Multidigit AD chip to ensure multibit data analysis, automatic mode, manual mode and multistage set operating modes coexist;Configuring PC software to obtain the stress and powder density curve;The relationship between the time and the yield strength of the powder; Kawakita’s equation of linear regression equation of constant u, v relation and time flow function relation analysis of process data and curve graph, Establish data models for new products and processes developed by manufacturing enterprises and research institutes.

四、适用范围Scope of Application：

食品、药品、粉末冶金、陶瓷、制药、化工、建筑等行业需要经过压缩或者压铸的粉末和颗粒物料；对粉末固体成形性及压缩性在新品开发，中试放大及生产过程中进行分析研究，常用于粉体企业上下游产业，粉体科研院所和大中专院校，为粉体在强度性能，可压缩性数据.

Food, medicine, powder metallurgy, ceramics, pharmaceutical, chemical industry, construction and other industries which need to be compressed or die-cast powder and granular materials. Analysis and research on powder solid forming and compressibility in the development of new products, in pilot plant scale and production, often used in powder enterprise upstream and downstream industries, powder research institutes and colleges, provide reliable data on the strength, compressibility and liquidity of the powder.