Product Features

| High-energy speed revolution 0-600/rotation 0-1600, infinitely adjustable.

| Ratio of revolution to rotation 1: 2.6

| Equipped with emitr remote control system, intelligent control with computers, mobile phones, PAD and other terminals

| Dry grinding, wet grinding, vacuum grinding, atmosphere protection grinding

| Intelligent digital one-button operation, simpler

| Can store 3 modes and 15 schemes, with power-off protection memory self-start function

| Cover opening safety switch and operation self-locking function design to ensure safety

 

Product Parameter

 

Model	Grinding jar     capacity	Vacuum jar capacity	Revolution speed	Rotation speed	Power	Voltage	Weight
MAX1600-0.4L	50-100(ml)	50(ml)	0-600(r/min)	0-1600(r/min)	2.2(kw)	220/50(v/hz)	200(kg)
MAX1600-1L	50-250(ml)	50-100(ml)	0-600(r/min)	0-1600(r/min)	2.2(kw)	220/50(v/hz)	210(kg)
MAX1600-2L	50-500(ml)	50-250(ml)	0-600(r/min)	0-1600(r/min)	4.4(kw)	220/50(v/hz)	300(kg)

 

Working Principle

Under the geometric structure and special movement mode of the grinding carrier, the high-frequency and high-intensity collision, shearing and friction directly generated by the grinding medium and the sample enable the sample to achieve extremely good grinding effect, with the characteristics of fast processing speed, small, uniform and consistent sample particle size.

 

Product Overview

The working principle of high-energy ball mill and planetary ball mill is the same. They both use centrifugal force to push the particles of the ball jar to collide and grind with the material. The balls in the grinding jar are affected by the superposition of Coriolis force (rotational deflection force) when moving with the grinding jar. In this way, the movement of the grinding balls generates high energy to crush the sample. The centrifugal force acting on the grinding jar drives the grinding balls to move in the direction of rotation. Due to the different speeds of the inner wall of the grinding jar and the balls, the sample and the jar wall produce strong friction and impact, releasing a large amount of kinetic energy. This combination of impact and friction makes the planetary ball mill extremely crushed during grinding, which leads to another experimental result "mechanical alloying".

Mechanical alloying refers to a powder preparation technology in which metal or alloy powder is subjected to long-term and intense impact and collision between powder particles and grinding balls in a mechanical alloying planetary ball mill, causing the powder particles to repeatedly produce cold welding and fracture, resulting in atomic diffusion in the powder particles, thereby obtaining alloyed powder.

Mechanical alloying powder is not like the alloy material formed by metal or alloy casting, where each component fully achieves atomic bonding to form a uniform solid solution or compound. In most cases, within the limited ball milling time, each component can only reach or approach the atomic level distance at those contacting points, lines and surfaces, and the final result is only a mixture or composite with very uniform distribution of each component. When the ball milling time is very long, in some systems, solid-state diffusion can also be used to make each component achieve atomic bonding to form an alloy or compound.

Product selection

The selection of high-energy ball mills requires several conditions. The speed must reach a certain high speed. According to the domestic 2L planetary ball mill, the diameter of the planetary main plate must reach 36cm, the revolution speed must reach 360r/min, and the rotation speed must reach 720r/min. Below this speed, it is difficult for the sample to obtain strong impact force and large amount of kinetic energy, and the sample cannot be high-energy ball milled. The material of each model of ball mill and meson of our company is as follows: stainless steel ball jar, zirconia ball jar, corundum ball jar, carbide ball jar, vacuum atmosphere protection ball jar, zirconia ball, stainless steel ball, carbide ball, others such as agate, nylon, polyurethane, polytetrafluoroethylene cannot be high-energy ball milled.

Most powders will oxidize during the high-energy mechanical alloying process. In order to make the experiment more scientific and accurate, the jar is selected to be vacuum atmosphere protected ball mill, and the sample inlet and outlet are equipped with Mitr acrylic vacuum glove box or stainless steel vacuum glove box to prevent the pre-treatment and post-treatment samples from contacting the air.

 

 

Factors affecting mechanical alloying

Mechanical alloying is a complex process, so to obtain the ideal phase and microstructure, it is necessary to optimize the design of a series of influencing parameters. The following are some parameters that have a significant impact on the results of mechanical alloying.

1). Grinding device

Grinding type There are many types of grinding devices for producing mechanical alloying powders, such as planetary mills, vibration mills, stirring mills, etc. Their grinding energy, grinding efficiency, degree of material contamination, and the force between the grinding media and the inner wall of the grinding jar are different, so they have a crucial impact on the grinding results. The material and shape of the grinding jar have an important influence on the grinding results. During the process, the impact and friction of the grinding media on the inner wall of the grinding container will cause part of the material on the inner wall of the grinding container to fall off and enter the grinding material to cause pollution. Commonly used grinding jars are usually made of hardened steel, tool steel, stainless steel, P>K>5; lined with hardened steel, cemented carbide, etc. Sometimes special materials are selected for special purposes, for example: when the grinding material contains copper or titanium, copper or titanium grinding jars are selected to reduce pollution.

2). Grinding speed

The higher the speed of the grinder, the more energy will be transferred to the grinding material. On the other hand, too high a speed will cause the grinding system to heat up too quickly and the temperature is too high, which is sometimes unfavorable. For example, higher temperatures may cause the decomposition of supersaturated solid solutions, amorphous phases or other metastable phases that need to be formed in the process.

3). Grinding time

Grinding time is one of the important factors affecting the results. Under certain conditions, as the grinding progresses, the degree of alloying will become higher and higher, the particle size will gradually decrease and then form a stable equilibrium state, that is, the cold welding and crushing of the particles reach a dynamic equilibrium, and the particle size no longer changes. But on the other hand, the longer the grinding time, the more serious the pollution. Therefore, the ideal grinding time should be determined comprehensively through experiments based on the required results.　　

4). Grinding media

When choosing grinding media, we should not only consider its material and shape, such as spherical and rod-shaped, like grinding jars, but also its density, size and distribution. The ball milling media should have appropriate density and size to produce sufficient impact on the grinding materials. These have a direct impact on the finished product. For example, when grinding Ti-Al mixed powder, if a grinding ball with a diameter of 15mm is used, a solid solution can be obtained later, while if a grinding ball with a diameter of 25 is used, even if the grinding time is longer under the same conditions, no Ti-Al solid solution can be obtained.

5). Ball-to-material ratio

The ball-to-material ratio refers to the weight ratio of the grinding medium to the grinding material. Usually the grinding medium is spherical, so it is called the ball-to-material ratio. The ball-to-material ratio used in experimental research is in the range of 1:1 to 200:1, and in most cases it is about 10:1. When doing small-scale production or testing, this ratio can be as high as 50:1 or even 100:1.

6) Filling rate

The filling rate of grinding media refers to the percentage of the total volume of grinding media to the volume of the grinding jar, and the filling rate of grinding materials refers to the percentage of the loose volume of grinding materials to the gaps between grinding media. If the filling rate is too small, the productivity will be low; if it is too high, there will not be enough space for the grinding media and materials to move fully, so that the impact generated is small, which is not conducive to the alloying process. Generally speaking, the filling rate of grinding media is between 60%-80%, and the filling rate of materials is between 100%-130%.

7).Gas environment

Mechanical alloying is a complex solid-state reaction process. Changes in any parameters such as ball milling atmosphere, ball milling intensity, and ball milling time will affect the alloying process and even the completed product. During the mechanical alloying process, due to the collision between balls and balls, balls and jars, mechanical energy is converted into heat energy, causing the temperature inside the ball mill jar to rise very high. At the same time, particle refinement often occurs during the alloying process, and defects are introduced. The free energy increases and can easily react with oxygen in the ball milling atmosphere. Therefore, inert gases such as argon are generally used in the mechanical alloying process. for protective gas. Different ball milling atmospheres will have a significant impact on the alloying reaction method, finished products and properties. The gas environment of grinding is an important factor in causing pollution, so it is generally carried out under vacuum or inert gas protection. But sometimes for special purposes, it is also necessary to grind in a special gas environment. For example, when the corresponding nitride or hydride needs to be generated, grinding may be carried out in a nitrogen or hydrogen environment.

8).Process control agent

During the mechanical alloying process, the powder has serious agglomeration, agglomeration and wall sticking phenomena, which greatly hinders the mechanical alloying process. For this reason, process control agents, such as stearic acid, solid paraffin, liquid alcohol and carbon tetrachloride, are often added during the process to reduce powder agglomeration, sticky balls, wall sticking, and wear of the grinding medium and the inner wall of the grinding container. It can better control the composition of the powder and improve the powder extraction rate.

9).Grinding temperature

Whether the finished product of MA is a solid solution, an intermetallic compound, a nanocrystal, or an amorphous phase, it all involves diffusion issues, and diffusion is affected by the grinding temperature, so temperature is also an important factor affecting MA, such as Ni-50%Zr When the powder system was vibrated and ball milled, no amorphous phase was found to form when it was ground under liquid nitrogen cooling for 15 hours; when grinding at 200°C, it was found that the powder material was completely amorphous; when grinding at room temperature, partial amorphization was achieved.

The above factors are not independent of each other. For example, the ideal grinding time depends on the grinding type, media size, grinding temperature, ball-to-material ratio, etc.

Mechanical alloying has the following advantages when synthesizing high-melting-point alloys or intermetallic compounds: it avoids the high-temperature melting and solidification processes of ordinary metallurgical methods, achieves alloying at room temperature, and obtains uniform alloys with fine structures, and the yield is high, so It has become a good method to produce alloys and new materials that are difficult to prepare by conventional means.