SINTERING


The operation of heating the green compact at high temperature in a controlled atmosphere (Reducing atmosphere which protects oxidation of metal powders). The Sintering increases the bond between the particles and therefore strengthens a powder metal compact. Sintering temperature and time of sintering depends on the type of powders and the strength required in a final product. The Sintering temperatures usually 0.6 to 0.8 times the melting point of powders.

01-Sintering-techniques-Powder-particles-Combining-joining

Type of powder                                   Sintering Temperature                 Time

Aluminium & Alloys                                   370 – 520 C                                  24 hrs

Copper, Brass, Bronze                                700 – 900 C                                  30 Mins

Iron                                                           1025 – 1200 C                              30 Mins


Stainless Steel                                           1180 C                                       20 – 40 Mins

Tungsten Carbide                                      1480 C                                      20 – 40 Mins

02-Sintered gears

Spark Sintering:

03-Spark plasma sintering-Joule heating-SPS

06-plasma discharge-sps

The process of simultaneous pressing & Sintering of metal powders by high energy electric spark. This spark is discharged from capacitor bank & removes the surface contaminants from powder particles. This cause the particles to form a solid cohesive mass. Immediately after spark, the current is continued for about 10 Seconds, with high temperature which further strengthens the bond used for sintering Aluminium, Copper, Iron and Stainless Steel.

 

 

04-Spark plasma Sintering-Complete Setup

05-SPS-Graphite Punch

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2 Comments on “SINTERING”

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