Diamond powder has the characteristics of high strength and good wear resistance,and has great advantages in superhard abrasives.Diamond powder refers to diamond particles with a particle size smaller than 54 microns.Its chemical composition is carbon and it is the hardest substance in nature.Diamond micron powder is micron or sub-micron ultra-fine diamond powder formed by crushing and ball milling of diamond single crystals.Diamond has high strength and good wear resistance.
Diamond micro powder products are in the middle reaches of the industrial chain and have a wide range of downstream application scenarios.Diamond micropowder is the core basic material for downstream diamond tool manufacturing and hard and brittle material processing.The industry chain consists of upstream raw material suppliers,midstream manufacturers and downstream application fields.
Diamond powder has high hardness and good wear resistance,and can be widely used in cutting,grinding,drilling,etc.It is an ideal raw material for grinding and polishing high-hardness materials such as cemented carbide,ceramics,gemstones,and optical glass.Diamond powder products are tools and components made from diamond powder.
In terms of particle size,diamond micron powder belongs to micron,submicron and nanometer powders.Compared with coarse-grained powder,its specific surface area and specific surface functional groups are significantly increased,so during the production process,the interaction force between particles is greatly increased.In addition,as the particle size is refined,the defects of the particles themselves are reduced,and the strength is bound to increase.It can be seen that the production process of diamond powder is quite difficult.It is not only a process of particle refinement,but also accompanied by changes in crystal structure and surface physical and chemical properties.Therefore,the production process of diamond micropowder is a multi-disciplinary engineering and technical issue involving machinery,powder engineering,mechanics,physical chemistry,modern instruments and testing technology.
Diamond powder production equipment
Diamond micropowder is obtained by crushing and classifying coarse-grained single crystal diamond.Using a ball mill to crush diamond to produce diamond powder is the most commonly used method.The ball mill crushing method has been used in the production of diamond powder in my country for many years and has achieved relatively satisfactory results.However,due to the shortcomings of low production efficiency,it has been replaced by airflow pulverizers.Airflow pulverizers use compressed air as the working medium.The compressed air is sprayed into the crushing chamber at high speed through a special supersonic nozzle.The airflow carries the material at high speed.It causes strong collision,friction and shearing between materials to achieve the purpose of crushing.The biggest advantage of the airflow pulverizer is that it is not limited by the mechanical linear speed and can produce very high airflow speeds.In particular,the supersonic airflow pulverizer can produce a flow rate several times the speed of sound,so it can generate huge kinetic energy and it is easier to obtain micron-level particles.and submicron ultrafine powders.From the perspective of crushing principle,this type of machine is more promising for the production of diamond powder.
Strength grading process of diamond powder
Particle size classification is a very important process in the diamond powder production process.It involves the production efficiency and quality of diamond micropowder.At present,one of the most widely used diamond micropowder particle size classification methods in China is the production of micropowder by a process that combines natural sedimentation and centrifugation.
The natural sedimentation method is a sorting method that directly applies Stokes’law.Based on the principle that particles with the same specific gravity have different sedimentation speeds in water due to different particle sizes,the particle size is classified by controlling the sedimentation height and sedimentation time.Although the equipment It is simple,easy to operate and has stable quality,but the production cycle is long and labor efficiency is low.To this end,many manufacturers at home and abroad have developed automated grading equipment,which uses computer technology and frequency conversion control technology.It is equipped with four major systems:automatic stirring,automatic pumping,automatic water circulation and computer control.It is fully digitally designed,precise in control,and energy-saving.Electricity has high efficiency,high reliability and good controllability that cannot be compared with manual operation.Compared with manual sorting,the efficiency can be increased by10 to20 times.It has high degree of automation,fast sorting speed,accurate sorting accuracy,no impurity pollution,no interference from human factors,strong product quality stability,good reproducibility,and low labor intensity for workers.The ten significant advantages of small enterprises include low labor costs and large one-time input quantities.It is in line with the future development direction of the micro powder industry.
With the increasing maturity of the diamond tool manufacturing industry and the rapid growth of China’s economy,my country’s market demand for diamond powder is also growing rapidly.The advancement of tool manufacturing technology has also put forward higher requirements for the upstream diamond powder industry.Since diamond powders with different crystallization states and particle types each have their own characteristics,a few domestic manufacturers have been able to produce different types of diamond powders according to different uses of diamond powders.For example:cutting tool discs(PCD),resin bonded grinding tools,metal bonded products,special diamond powder for grinding paste,etc.This is an important step for my country’s diamond micro powder industry to upgrade and adjust its product structure,develop towards high-end specialization,and catch up with the world’s advanced level.