Abstract
This paper describes the thermal-distribution of TiB2-Ni-P sample by sintering with a direct electric current used various graphite mould and hollow graphite disk.
1) By examining the influence of the clearance between graphite die body and punch, the specific resistance, and the thickness of die body on the thermal-distribution of sample, the mechanism how electric current passed through graphite die body and sample was studied. It was known as the result that the clearance resistance exerts a most influence on the electric current flow or on the thermal-distribution of sample.
2) By using the graphite die and the clearance of 0.01-0.03 mm, the thermal-distribution of sample was kept uniformly in the vacuum, but was not uniform in the air.
3) By inserting the hollow graphite disks between sample and punchs, the sample temperature was kept to be uniform even in the air. Because the electric current was dispersed from the center to radial direction of the disks.
