Development trend and production status of Chinese boron powder
Because of the plasma with high temperature,Guest Posting excessive enthalpy, excessive chemical reactivity, and feature controllability to the reaction atmosphere and the reaction temperature and different characteristics, show unique advantages inside the synthesis of the powder material education and ball managing, reason people’s interest.
Currently, the plasma powder processing retumbo powder for sale generation already has a substantial length production ability. RF plasma approach has performed the tungsten powder, molybdenum powder, rhenium powder, tantalum powder, nickel powder, copper powder and other spheroidizing treatment of steel powder.
From the Nineteen Eighties, China has commenced to discover the usage of plasma spheroidized tungsten powder, however there has been a moderate oxidation phenomena on the round tungsten powder floor, so as to put together pure round tungsten powder, it also want to conduct hydrogen discount on the spheroidization processed powder, in order that the production performance is low, value more, difficult to obtain the necessities of commercial manufacturing.
Recently, scientists have evolved the first plasma powder processing machine in China, the gadget makes use of a water-cooled quartz plasma torch substantially reduce the quantity of inert cooling gas, efficaciously avoid the oxidation of tungsten metal powder in spheroidization procedure. Use irregular form tungsten powder as the uncooked fabric, the particle length within the range of 5.Five ~ 26.5¼m, thru plasma nodulizing coping with to reap a easy surface, proper sphericity powder, its spheroidization fee reached one hundred%, and stays single segment tungsten powder after spheroidizing.
The bulk density of 26.5¼m particle length tungsten powder after spheroidizing was progressed from 6.80g/cm3 to 11.5g/cm3, the powder liquidity additionally improved markedly. The research display that any such radio-frequency plasma processing approach can organized micron unmarried segment round tungsten powder, does no longer exist powder oxidation hassle, excessive manufacturing efficiency, low value, appropriate for industrialized production requirements. They additionally studied the have an impact on of procedure parameters to tungsten powder spheroidized, found the affordable feed fee is an essential aspect to make certain the powder spheroidization price. Excessive feed rate can’t fulfill the want of tungsten powder absorb warmth, melting and spheroidizing, also result in a part of the powder in the plasma strolling song deviate the plasma high-temperature vicinity, make the powder absorbing now not enough warmth, resulting the processed powder reduce spheroidization charge. In addition, while the feeding fee is constant, the spheroidization charge decreased with the preliminary powder particle size multiplied. The smaller the preliminary powder particle length, the bigger the unique floor area, while the plasma soak up more strength inside the crossing, it’s going to more conducive to powder spheroidization. Generally, as powder particle size decreased, the melting point decreased, take in the equal amount of power is less complicated to spheroidizing. Therefore, underneath the equal procedure parameters, smaller particle length of the powder with better spheroidization fee.
Use RF plasma spheroidizing different metals including non-ferrous steel powder. RF induction thermal plasma organized submicron copper powder, while copper powder through plasma, seems gasification, nucleation, condensation. However, the low melting factor metal inside the plasma sphere technique inevitably occur evaporation and gasification, the organized metal powder consist of quite a few first-rate spherical powder acquired by using evaporation, coagulation, particle size variety of the product distribution is broader. This is a trouble to be solved.