Characteristics of Metal Powder Metallurgy

metal powder metallurgy

characteristics of metal powder metallurgy(http://www.zcmim.com/):
1. Product density is controllable, such as porous materials, good density material, etc.;
2. Grain fine and uniform microstructure, no composition segregation;
3. Net shape forming, the utilization rate of raw materials > 95%;
5. Less cutting, cutting only 40 ~ 50%;
5. Composition of materials is controllable, applying composite materials;
6. Preparing refractory metals, ceramic materials and nuclear materials.

Original article link：http://www.zcmim.com/article/metal-powder-metallurgy-comp_1.html

ZCMIM see the future development trend of powder injection molding industry

ZCMIM was founded in 2007, now has 8 years of powder injection molding industry experience. Company has become one of the largest, most experienced metal powder metallurgical enterprises, supply 1500 a variety of metal powder products, plant area covers an area of 8000 square, its products are widely applied in many areas, including powder metallurgy parts, industrial metal parts, MIM parts, smart wearable metal accessories, apple adapter, stainless steel pinion, mobile phone metal parts supply and so on.

At present, China's powder metallurgy parts and bearing the total output value of more than 5 billion 500 million yuan, accounting for a smaller proportion of the global market, the development of space is also relatively broad. Through the continuous introduction of foreign advanced technology and independent innovation combination, powder metallurgy industry and technology of China are showing a rapid development momentum, industry one of the fastest growing parts of China general machinery industry, every year, the powder metallurgy industry, the output value of with high speed increasing.

With the rapid development of automobile industry, machinery manufacturing, metal industry, aerospace, instrumentation, hardware tools, construction machinery, electronic appliances and high-tech industries such as, for the powder metallurgy industry brought rare development opportunity and huge market space. In addition, the powder metallurgy industry has been included in the priority development and encourage foreign investment projects, the development prospects are broad.

The development of metal powder injection molding is influenced by several key factors.

a new type of forming technology, the development of metal powder injection molding is affected by several key factors. These factors determine the development prospects, development speed and development trend of the technology. These factors are well studied, can promote the further development of metal powder injection molding, and can not solve the problem of the development of the resistance.          

Metal injection molding technology of the material composition, including metal powder and binder two parts. Simply put, the powder metallurgy and metal binder in certain proportion, according to the provisions of feed mechanism and order in under the action of high temperature and shear stress were mixing and uniform structure of feeding and the granulator granulation. Due to the presence of binder, granulating material in the injection molding machine injection has good rheological property, can be filled completely to the cavity of the mold. After the forming, the body is obtained by taking off the organic component of the body and sintering the densification process, and the product can be obtained.          

From the seventies of the 20th century to the present only lasts for a few decades time, metal powder injection forming technology has made considerable development and progress, but from the development also exposed some of the shortcomings of current technical route and process route. These deficiencies in the objective to prevent the technology to a deeper level of development. So it is urgent to solve these problems.

In the past two years, MIM technical progress is mainly reflected in what areas?

1) is the first equipment level has been considerable increase: from feeding equipment, injection machine and debinding and sintering equipment, and analysis and detection equipment and automation level, nearly three years of development over the level of the past 15 years.

2) MIM technology for the development of special mold: mold manufacturing technology from the experience of plastic mold to the MIM dedicated to the development of the mold, you can create a higher level of MIM mold.

3) feeding technology: feeding technology from wax based feed to wax based and plastic based feed coexistence direction, no longer rely on BASF feeding system.

4) metal powder metallurgy manufacturing technology has been greatly improved, water atomization, aerosol powder can replace Japan and Europe and the United States powder.

What are the advantages of powder metallurgy products?

In recent years, the powder metallurgy industry in the market to fight the fiery, but the metal powder metallurgy which has the advantages of it? Want to know with the Shenzhen MIM manufacturers ZCMIM together to see it!

1. The yield is high, for example to make a gear, the general gear shaper, gear hobbing and other machine to cut off a lot of material, powder metallurgy is not.

2 high melting point materials can be processed, tungsten and molybdenum are almost all produced by the powder metallurgy method, because the melting point is too high and it is difficult to be melted.

3 can be made of porous materials, such as oil bearing, can be stored oil.

4 high production efficiency, because you do not need to machine processing can produce complex shape. Used for small size parts.

5 suitable for making metal matrix composites, such as tungsten / copper composites.

High performance metal powder market share is increasing

China is a big country in the world, the rapid development of the national economy is a great demand for high and new materials, especially the rapid development of automotive and electronic industries, the demand for high-end powder metallurgy products is strong.

In addition, countries in the world are constantly strengthening the research and development and application of 3D printing technology, the United States and some European Union countries have led the world 3D printing technology, and in the application and promotion of the technology to get the initiative. Powder metallurgy forming technology to make the powder "grow into" parts, for the development of 3D printing technology provides a convenient, boost metal powder metallurgy into a power of the industry.

In recent years, enterprise of our country iron through in the production of grasp quality, grasping the marketable products, generally improve the quality of iron powder, also opened the hedonic price gap. At present, the status quo of the domestic iron powder market is high quality iron powder and special use of iron powder in short supply, the production of surplus products, high-end powder metallurgy products still need to be imported from abroad.

MIM powder metallurgy process applications

MIM process used in the metal powder particle size is generally 0.5 ~ 20μm; Theoretically, the finer the particles, the greater the specific surface area, ease of molding and sintering. The traditional powder metallurgy process is used more than 40μm of coarse powder.

Role of organic binder is an adhesive metal powder particles, so that the mixture is heated in a cylinder having a jet rheology and lubricity, i.e. drive carrier powder flow. Thus, the adhesive is selected carrier throughout the powder. Therefore, selection is the key to pull sticky powder injection molding. The organic adhesive requirements:

1. Use less, use less adhesive makes mixture produce better rheological;

2. does not react, in the course of removal of the adhesive with the metal powder can not afford any chemical reaction;

3. easy to remove, no residual carbon in the products. Mixing metal powder metallurgy and organic binder uniformly blended together, so that a variety of raw materials become injection molding mixes. Mixture uniformity directly affects their mobility, thus affecting the injection molding process parameters, as well as the density and other properties of the final material. This step injection molding process and plastic injection molding process in principle is the same, which is basically the same device condition.

Proven metal powder metallurgy auto parts in the proportion of light to do

Powder metallurgy products are used forming and sintering of metal powder ( or mixture of metal powder and nonmetal powder ) is made of materials and products technology. It is a branch of metallurgy and materials science . Applications of powder metallurgy products is very wide , from general machinery manufacturing to precision instruments ; from hardware tools to large machinery; from electronics to the motor manufacturing industry ; from the military industry to civilian industry ; from the general to sophisticated high-tech technology , can see powder metallurgy figure

In corrosion resistance and high temperature performance, compared with ordinary steel stainless steel can be thinner and more compact, so as to achieve the purpose of weight reduction. Compared with castings and forgings powder metallurgy, powder metallurgy auto parts lighter specific gravity (due to pore more), plus its high precision, low cost reasons, it is used in the auto parts more widely. Lightweight cast iron castings mainly in its gravity is less than castings and forgings. In addition, the production process than cast iron cast steel excellent abrasion resistance, cut resistance, thermal resistance and vibration absorption, also superior to steel, cast iron instead of steel, forgings trend in the car manufacturing increasingly large , instead of ductile iron crankshaft forgings is the most successful example.

Auto parts supply work, the relationship between the production and operation of enterprises huge supply shortage will affect production, excess inventory, backlog of capital. For these situations, we focus on practical work in the market mechanism, to explore a reasonable balance between supply and demand of auto parts, suitable for the market economy and the establishment of the characteristics of supply and demand mechanism itself, make a good supply of auto parts production and management services for businesses. Possession of the national economy can not be underestimated, the relevant departments should closely cooperate fully imported cars function.

Compared with metal injection molding and other molding technology

MIM(metal injection molding) is a small or no cutting process(also called near net-shape). Compared with traditional casting technology, the advantages of MIM as following:

1.High surface smoothness, newest data from ZCMIM is surface R1.6 at lowest 

2.Small tolerance and high precision dimension. Current domestic metal injection molding manufacture ZCMIM can do tolerance within 0.03mm~0.05mm. Some items can do with lower tolerance after post treatment.

3.It is possible to prepare alloy materials and composite materials

4.Good stability(no stand hole and shrink hole) and reliable mechanics performance

5.Low energy consumption

Powder particle shape of the metal powder metallurgy parts manufacturing is what?

Metal powder metallurgy parts manufacturer mainly using metal powder processing, then the metal powder metallurgy particle shape is like?

Chemical properties depending on chemical purity of raw materials and milling methods. Higher oxygen content decreases suppress performance, compact mechanical properties of strength and sintered products, so most of the technical conditions for this PM has certain requirements. For example, to allow the oxygen content of the powder is 0.2 to 1.5%, which is equivalent oxide content of from 1% to 10%.

Mechanical Properties Mechanical properties of the powder that is a powder process performance, it is important in powder metallurgy process parameters. Powder bulk density volumetric method is weighed when pressed basis; powder flowability of the powder to determine the speed and press die filling production capacity; powder compression process and the decision to suppress the difficulty of exerting pressure height; the powder moldability determines the strength billet.

mim metal powder metallurgy process performance

mim metal powder metallurgy process performance including liquidity, filling properties, compression resistance and formability.

1. The charge characteristics

Means in the absence of external conditions, the tightness of the accumulation of powder free time. Often the bulk density or bulk density expressed. The size of the particles of the powder filling characteristics, shape and surface properties related.

2. Liquidity

Refers to the powder flowability, time used 50 grams of powder from a standard funnel flow time representation. Granule adhesion of liquidity by.

3. Compression

It indicates the ability of the powder metallurgy in the pressing process is compacted under pressure by a predetermined unit achieved green density expressed in standard mold, measured under the conditions specified lubrication. Factors affecting powder compressibility particulate plastic or micro-hardness, ductility metal powder than the hard, brittle material compression is good; the shape and structure of the particles also affects the compressibility of the powder.

4. formability

Refers to the powder compaction, the compact's ability to maintain a predetermined shape, the smallest unit capable of forming a powder compaction pressure, or by a strength of compacts to measure. Formability affected particle shape and structure.

Compared metal injection molding with hot die forging technology

MIM(metal injection molding) is a small or no cutting process(also called near net-shape). Compared with hot die forging technology, what advantages do MIM? ZCMIM company had made a general analysis as following:

1. The precision of powder metallurgy components is much higher than hot die forging technology.

2.    Powder metallurgy can save material and control the weight accurately

3.    Metal injection mold MIM process only need one set of molding tooling and one set of forming tooling, but hot die forging must need two or more molding tooling and one set trimming tooling.

Compared with metal injection molding and other molding technology

MIM(metal injection molding) is a small or no cutting process(also called near net-shape). Compared with traditional casting technology, the advantages of MIM as following:

1.    High surface smoothness, newest data from ZCMIM is surface R1.6 at lowest 

2.    Small tolerance and high precision dimension. Current domestic metal injection molding manufacture ZCMIM can do tolerance within 0.03mm~0.05mm. Some items can do with lower tolerance after post treatment.

3.    It is possible to prepare alloy materials and composite materials

4.    Good stability(no stand hole and shrink hole) and reliable mechanics performance

5.    Low energy consumption