Manufacturing process using microwave for thermal debinding

Abstract

A manufacturing process using microwave for thermal debinding according to the invention is mainly applied in manufacturing process of powder metallurgy. Wherein, metal powder is mixed polymer materials such as adhesives, fillings or lubricants, and a body is formed by means of molding, forging, extrusion, injection or scraping. The body to be debinded is placed in a microwave environment in an exposed manner or covered with powder, and power and work time of microwave are set for rapidly heating and debinding the body. The manufacturing process according to the invention is capable of accelerating manufacturing procedure, economizing production cost, reducing defects, quickly drying and rapidly removing polymer materials.

1 . A manufacturing process using microwave for thermal debinding comprising the steps of: 
 a. forming a body from a mixture of metal powder and polymer materials;    b. debinding the body using microwave heat;    c. sintering the debinded half-finished product; and    e. forming a sintered finished product after lowering temperature thereof; and    the characteristics thereof being that, when the body enters the debinding procedure, the body is placed into a microwave environment, and is debinded after adjusting power and setting work time of microwave.    
     
     
         2 . The manufacturing process using microwave for thermal debinding according to  claim 1 , wherein the body is exposed in the microwave environment for debinding.  
     
     
         3 . The manufacturing process using microwave for thermal debinding according to  claim 1 , wherein the body is put into a crucible and debinded along with the crucible in the microwave environment.  
     
     
         4 . The manufacturing process using microwave for thermal debinding according to  claim 1 , wherein the body is put into a powder bed, covered by microwave-absorbent powder, and placed into the microwave environment.  
     
     
         5 . The manufacturing process using microwave for thermal debinding according to  claim 1 , wherein the debinded half-finished product is continuously and directly heated to a sintering temperature in the microwave environment, and then placed into a furnace having reached a sintering temperature.  
     
     
         6 . The manufacturing process using microwave for thermal debinding according to  claim 1 , wherein the debinded half-finished product is directly sintered using microwave in the microwave environment.  
     
     
         7 . The manufacturing process using microwave for thermal debinding according to  claim 1 , wherein the metal powder is made of a pure metal from or an alloy of iron (Fe), titanium (Ti), copper (Cu), magnesium (Mg), nickel (Ni), chromium (Cr) and manganese (Mn).  
     
     
         8 . The manufacturing process using microwave for thermal debinding according to  claim 1 , wherein the body is formed by means of molding, forging, extrusion, injection or scraping.  
     
     
         9 . The manufacturing process using microwave for thermal debinding according to  claim 4 , wherein the powder bed is made of a mixture of aluminum oxide (Al 2 O 3 ) or a mixture of silicon oxide (SiO 2 ) and zirconium oxide (ZrO 2 ) of any ratio.  
     
     
         10 . The manufacturing process using microwave for thermal debinding according to  claim 1 , wherein the polymer materials are any from acrylic, ethyl cellulose, hydroxypropyl cellulose, polypropylene cellulose, polypropylene, polyacetal polymer, ethylene vinyl acetate, atactic polypropylene, sterene-butadienecpolymer, methyl cellulose, polyethylene, oxidized polyethylene, cellulose acetate, nylon, polystyrene, polybutylene, polysulfone, paraffin wax, mineral oil, vegetable oil, fatty acid, fatty alcohol, fatty ester, hydrocarbon wax, epoxy, polyphenylene, phenol, stearic acid, ester wax, oleic acid, diethyl phthalate, and formaldehyde.