The conclusions are as follows : ( 1 ) high - pressure water - atomization can be used to produce a pre - alloyed steel powder with high apparent density , high green strength , size - stability after sintering and low hydrogen - loss content ; ( 2 ) the higher smelting temperature and / or water pressure , the finer particle size of steel powders ; ( 3 ) when the atomization angle holds in a reasonable value ' s range the obtained powder will have a better particle size distribution ; ( 4 ) an optimum atomization technological parameters : liquid steel flux , water pressure and water prick angle was obtained ( 5 ) reduction variables ( temperature , holding time , material - bed ' s thickness and reducing gas flux ) have a significant effect on the particle agglomeration and properties of final powder was given ( 6 ) different alloying methods were developed to modify properties of ferrous powder materials and hence to broaden its applications in ferrous powder metallurgy industry
12.
With the fdtd method to solve the maxwell equations , with the finite - volume method to solve the n - s equations and with the single temperature local thermal equilibrium to solve plasma , first time to adopt the method of all numerical simulation , the coupling flow field of microwave plasma within resonant cavity of mpt was analyzed . for tm011 model and tem model , the matching relation between various parameters and its influence on the coupling flow field of microwave plasma within resonant cavity of mpt was studied separately . the reasonable selection of miniaturization design parameters was pointed out in the numerical simulation to be used in mpt miniaturization , i . e . throat , gas flux and microwave power should be smaller suitable after miniaturization
13.
Characters including : fuel atomization device replaced by gas sprayer , gas supply controlled by gas flux valve ; separate fuel supply from combustion - supporting air , regulate air supply through changing the electioneering voltage to make the fully burning and improve efficiency and reduce fuel consume ; arts and crafts are simple , the modification of the oil heater ' s configuration is little and the heating power is not below the oil heater ' s level ; because of falling the voltage of electioneering , greatly descend the noise of the sample machine compared with the original
