The so-called induction heating style putting the heated workpiece on intermediate frequency or colossal frequency AC modern sensor circle. So in the workpiece, due to the induction, the induced present has corresponding frequency with the induction knot current
Analysis on temperature of metal powder and diamond
The induced latest distribution is uneven on the workpiece within the vertical to the rule of tenacity dominion The voguish density of important allowance is nearly zero, while the surface latest density is mammoth That is called the abrasion effect. Higher the current frequency is, thinner the surface layer commit be Usually any generous of metal has a certain resistance So with the functions of present concentrated at the surface, it bequeath create sizeable amounts of joule heat and the surface consign be heated rapidly
The sintering temperature of the spark sintering indirectly reflects the heating temperature of the manganese powder from the mold, the temperature than the metal powder of diamond sintered products at much lessen temperatures, so the spark sintering of sintered diamond products further appropriate. The spark sintering heating pace for the next reasons: First, sintering and spark a special apparatus to free the heat banal with the joint role of the Joule heat; spark sintering of firmness loss, gigantic zeal utilization. Spark sintering heating degree without soaking time, so the higher the reform of temperature measurement methods and measurement components to make the measured temperature is a true thinking of the real-time temperature of the sintered powder, requiring temperature measurement methods and measurement components higher, for the measured temperature to truly reflect the real-time temperature of the sintered powder, necessitate Thermometer has colossal finesse Sometimes the temperature measurement devices in a thumping succinct case and the temperature of the metal powder, because the insulation quiescent 4min soaking circumstance after the sintering temperature is reached, reflecting the temperature is essentially the true temperature of the sintered powder
Spark sintering temperature influence as far as feasible to actually radius the temperature of the sintering process should do the inspection temperature and temperature parts, especially the remarkably crisp sintering instance occasions, such as the absolute sintering process in seconds calculation, the temperature the fresh important. The moving resistance of the metal powder is uncommonly loose than small, so that the fluidity of the powder, loose powder is too large, can not be pretended Early in the moulding of magnetic materials and Powder Metallurgy products production which had been used granulation, because the moulding of large, into one hundred tons, 10 tons of powder granulation sintering subjugate the manufacture of diamond kit in the process of granulation, can separate metal powder granulation, can with granulating diamond and metal powder diamond nuclei, coated metal powder, granulation of the modern can be reduced due to the differences in the standard caused by mixing inequality and rectify the action of the tool
Foe the application of ultra-fine metal powder, granulation is a practical way. If the granulation process is not properly, it will lessen performance of the apparatus In general, after the granulation, it should be broken by cold pressing Then the processes are sintering or hot pressing. If sintering or hot pressing is taken immediately after granulation, the generate is manageable to reckon It is not powder metallurgy after the granulation. So the diffusion is fatiguing to obtain and it has tall porosity. To discourage this phenomenon, people must prime put on broken nibs It requires enough mold force The graphite mold may not become suitable. Although the protuberance to steel mold or carbide mold will increase costs, but it can gain redemption from the revise tool performanceSource:http://wwwmhcmp.com