©t生Particle size distribution ④生Particle size distrbution 国a生Particle size distrbution Particle size distribution Particle size distribution Particle size distribution ·Fre问uency size distribution频率分布 ·Normal distribution正态分布 ·Count basis个数基准 ·Cumulative size distrbution累积分布 ·Log-normal distributon对数正态分布 Mass basis 质量基准 ·Surface basis面积基准 ·Volume basis体积基准 ·Length basis长度基准 ,Undersize distribution痛上分布 ·Oversize distribution暗下分布 国生一 Morphology Mean diameter 式 Methods used to determine particle size ∑d1∑n ·3 icrcopic method是微镜法 The shape affects the flow and packing ,Co点r coumer ethod库尔特计数法 properties of a powder,as well as having 烟验录多的龄子直登 ·mchd态光射法 ·mem沉法 some influence on the surface area. 紧积中饲值《D) ·Specificsuface ea mcthod此表面积法 ∑dI∑ 围Shape index形状指数 面积长皮平尚轻 ·Sieving methodi游分法 ·动日 ∑nd1∑u 国Shape factor}形状系数 ∑nd1∑m Specific surface area ©t生Specific surface area 图Specific surface area 象Volume specific surface area体积比表面积 象Gas adsorption method气体吸附法 ©Gas permeability method气体透过法 S.=42400602x100 14AP.1c2 ④Weight specific surface area重量比表面积 pVn-L·Q1-s)2 1,C-1.卫 6 V(P-P)V.C+V 22 Shanghai Jiao Tong University Particle size distribution Particle size distribution • Frequency size distribution频率分布 • Cumulative size distribution累积分布 • Undersize distribution筛上分布 • Oversize distribution筛下分布 频率百分数 % Shanghai Jiao Tong University Particle size distribution Particle size distribution • Normal distribution 正态分布 • Log-normal distribution 对数正态分布 Shanghai Jiao Tong University Particle size distribution Particle size distribution • Count basis 个数基准 • Mass basis 质量基准 • Surface basis 面积基准 • Volume basis 体积基准 • Length basis 长度基准 Shanghai Jiao Tong University 名称 公式 算术平均径 Arithmetic mean diameter 众数径 Mode diameter 频数最多的粒子直径 中位径 Medium diameter 累积中间值（D50） 面积-长度平均径 Surface length mean diameter 体面积平均径 Volume surface mean diameter 重量平均径 Weight mean diameter nd nd 2  /  nd nd 4 3  /  nd nd 3 2  /  nd n /  Mean diameter Shanghai Jiao Tong University Methods used to determine particle size • Microscopic method显微镜法 • Coulter counter method库尔特计数法 • Photon correlation spectroscopy method动态光散射法 • Sedimentation method沉降法 • Specific surface area method比表面积法 • Sieving method筛分法 • Mush目 Shanghai Jiao Tong University Morphology The shape affects the flow and packing properties of a powder, as well as having some influence on the surface area. Shape index形状指数 Shape factor形状系数 Shanghai Jiao Tong University Specific surface area Volume specific surface area体积比表面积 Weight specific surface area 重量比表面积 S s v d n d n d v     2 3 6 6 S s w d n d n d w       2 3 6 6 Shanghai Jiao Tong University Specific surface area Gas adsorption method气体吸附法 23 6.02 10 22400     m w V S A 0 0 1 1 ( ) p p V C V p p V C p m m      Shanghai Jiao Tong University Specific surface area Gas permeability method气体透过法 2 2 (1 ) 14            L Q A P t Sw