Preparation method for porous stainless steel

The invention provides a preparation method for porous stainless steel. Total volume V and porosity of the porous stainless steel are first determined as needed, and after the volume Vs of various raw materials are calculated according to formulas, stainless steel powder and pore-forming agent are extracted and mixed for 60-210 minutes according to a calculation result. The mixed powder is in spark plasma sintering for 10-30 minutes under the temperature of 700-1100 DEG.C to obtain a sintered body. After being cooled till room temperature, the mixed powder is brewed by water for 30-180 minutes, so that the pore-forming agent can be completely dissolved or hydrolyzed, and then the porous stainless steel is obtained. The porosity and pore diameter of the porous stainless steel are controlled through size and volume percent of powder, and preparation of the porous stainless steel with a controlled pore structure is achieved by the aid of the strengthening sintering function of SPS (spark plasma sintering) and dissolution removing of water soluble (hydrolyzed) salt pore-forming agent. The porosity of the obtained porous stainless steel is 30-70%, the pore diameter is 75-1000 micrometers, and accordingly the preparation method for the porous stainless steel has the advantages of low cost, controlled pore structure and simple, stable and high-efficient processing, and industrial production can be achieved by the preparation method.