The so-called induction heating routine putting the heated workpiece on intermediate frequency or rangy frequency AC existing sensor circle. So in the workpiece, due to the induction, the induced voguish has twin frequency with the induction twirl current
Analysis on temperature of metal powder and diamond
The induced latest distribution is uneven on the workpiece within the vertical to the behest of power discipline The fashionable density of important share is partly zero, while the surface present density is mammoth That is called the gall generate Higher the voguish frequency is, thinner the surface layer will be Usually any kindly of metal has a certain resistance. So with the functions of existing concentrated at the surface, it leave originate sizeable amounts of joule heat and the surface entrust 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 cut temperatures, so the spark sintering of sintered diamond products other appropriate. The spark sintering heating speed for the following reasons: First, sintering and spark a special gadget to liberate the heat dual with the joint role of the Joule heat; spark sintering of strength loss, gangling energy utilization Spark sintering heating proportion without soaking time, so the higher the mend of temperature measurement methods and measurement components to make the measured temperature is a true deliberation 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, oblige Thermometer has colossal thoughtfulness Sometimes the temperature measurement devices in a remarkably economical case and the temperature of the metal powder, because the insulation inactive 4min soaking occasion after the sintering temperature is reached, reflecting the temperature is essentially the true temperature of the sintered powder
Spark sintering temperature impact as far as practicable to actually span the temperature of the sintering process should do the check temperature and temperature parts, especially the extraordinary economical sintering point occasions, such as the whole sintering process in seconds calculation, the temperature the other important. The motion resistance of the metal powder is thumping loose than small, so that the fluidity of the powder, loose powder is too large, can not be pretended Early in the forming of magnetic materials and Powder Metallurgy products creation which had been used granulation, because the forging of large, into one hundred tons, 10 tons of powder granulation sintering overwhelm the moulding of diamond equipment 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 later can be reduced due to the differences in the ratio caused by mixing inequality and refine the exploit of the tool
Foe the application of ultra-fine metal powder, granulation is a specialist way. If the granulation process is not properly, it commit impair action of the tools. 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 originate is manageable to imagine It is not powder metallurgy after the granulation So the diffusion is fatiguing to procure and it has high porosity. To dissuade this phenomenon, kinsfolk must top put on broken nibs It requires enough mold strength The graphite mold may not become suitable. Although the doorknob to steel mold or carbide mold consign intensify costs, but it can achieve reclamation from the reform mechanism performanceSource:http://wwwmhcmp.com