Positive,counter precipitation method in the process of ultrafine nickel powder prepared by vacuum thermal decomposing from the precursor

Using positive,counter precipitation methods,the particle size of nickel oxalate was controlled by adding surfactant,adjusting temperature and pH value.Nickel powder was obtained by vacuum thermal decomposition processes from the precursor.The TG-DTG,SEM,XRD techniques were used to carry out the analysis of the products.The results showed that the positive precipitation was superior to the counter precipitation.The nickel powder with particle size of 0.3-0.5 μm was obtained.