The neck growth and change of neck tensile strength of particle bonding resulting from solid-bridge force were investigated.Experimental observation indicated that the neck growth process could be well explained by the sintering theory.The effect of bond time on the neck was less than that of bond temperature.With increasing bond temperature

neck tensile strength increased firstly

and then decreased rapidly due to the appearance of liquid phase.The strength increased as bond time increased and then reached a constant value finally.The strength also increased with increasing contact pressure.It was found that neck tensile strength was smaller than material strength at the same temperature and lattice defects existed in the neck.The dimensionless neck strength changed slightly and was smaller than 0.1 times of material strength when temperature was lower than 0.8 times of melting point.When temperature was higher than 0.8 times of melting point，dimensionless neck strength increased apparently and was close to material strength.