MIM Material

Here Is The Good Intro About The MIM(metal injection molding)

There are several materials that can be used for MIM (Metal Injection Molding) process, some of the most commonly used materials include:

  • Stainless steel: This is a popular material choice for MIM due to its excellent corrosion resistance and strength.
  • Titanium: This high-strength material is often used in aerospace and medical applications.
  • Cobalt-chrome: This metal alloy has excellent wear and corrosion resistance, making it ideal for use in orthopedic implants.
  • Inconel: This nickel-based alloy is known for its high-temperature strength and corrosion resistance, making it ideal for use in aerospace and gas turbine applications.
  • Copper: This material has excellent electrical conductivity and thermal conductivity, making it a popular choice for electronic components.
  • Tungsten: This high-density metal is often used in weights and counterweights, as well as for radiation shielding.
  • Aluminum: This lightweight metal is often used in automotive and aerospace applications.
  • Magnesium: This lightweight metal is known for its high strength-to-weight ratio, making it ideal for use in aerospace and automotive applications.
  • Nickel: This material is often used for its high-temperature strength and corrosion resistance, as well as for its magnetic properties.
  • Zirconium: This material is known for its excellent corrosion resistance and biocompatibility, making it ideal for use in medical implants.

Main Application

MIM can be used to produce various complex metal parts for applications such as firearms, medical devices, aerospace, automotive, electronics, consumer goods, jewelry, and military equipment.

Fe-based alloys

Fe-2Ni, Fe-8Ni

Most used in Automobile,Tool

Stainless steel

304, 316L, 17-4PH, 420, 440C

Medical and horologe components,Consumer electronics

Hard alloy

WC-Co

Cutter, horologe and watch

Ceramic

Al2O3, ZrO2 , SiO2

IT electronic, daily necessary,Jewelry

Heavy alloy

W-Ni-Fe, W-Ni-Cu, W-Cu

Mikitary industry, communication Parts

Titanium alloy

Ti, Ti-6Al-4V

Medical and Military and Sea Parts

Magnetic material

Fe, Fe50Ni, Fe-Si

Magnetic components, soft magnetic

Tool steel

42CrMo4, M2

Tools

Heat conduction, electric conduction

MIM Material Properties

Material

Density

Hardness

Tensile strength

Elongation

g/cm 3

Rockwell

MPa

%

Fe-based alloys

MIM-2200 (Sintered)

7.60

45HRB

290

40

MIM-2700 (Sintered)

7.60

69HRB

440

26

MIM-4605 (Sintered)

7.60

62HRB

415

15

MIM-4605 (quench/temper)

7.60

48HRC

1655

2

Stainless steel

MIM – 316L (Sintered)

7.85

67HRB

520

50

MIM- 17-4PH (Sintered)

7.5

27HRC

900

6

MIM- 17-4PH (Heat Treated)

7.5

40HRC

1185

6

MIM – 440C (Sintered)

7.5

65HRB

415

25

Tungsten alloy

95%W-Ni-Fe

18.1

30

960

25

97%W-Ni-Fe

18.5

33

940

15

Fine ceramic

Al2O3

3.9

HRA92

160

ZrO2

6.0

HV1250

Stainless Steel

Low alloy steel is also known as Fe-based alloy steel, which is characterized by high hardness and strength.
MIM material property

MIM Material Density

Mechanical Properties

The characteristic of the tensile is almost the same as cnc or casting or other process.

Corrosion Resistance

Cause the chrome is degrade when sintering process.We could use the right post-sintering and surface treatment to get a better corrosion resistance.

Bio-compatibility

More and more industrial need bio-compatibility,such as medical ,and dental device,We recommend the post-sintering and electrical chemical treament to cover the mim parts for bio-compatibility.

F.A.Q.

MIM Material

MIM material is created using a variety of metals including stainless steel, titanium, and magnetic alloys. Our material provides high precision, accuracy and consistency when it comes to creating small metal parts. It’s an excellent option for those who are looking for superior quality without compromising on cost.
MIM (Metal Injection Molding) and PIM (Powder Injection Molding) are advanced metal fabrication techniques that enable the production of complex, intricate parts with high precision and repeatability. MIM is often used to produce small, intricate metal components with tight tolerances and a high degree of consistency. Furthermore, MIM processes can be used to achieve detailed textures and finishes on both internal and external surfaces.
MIM parts have a density of up to 95%, meaning that the material is extremely dense and hard. The high-density makes it an ideal material for creating small, intricate parts with precision. It also has excellent surface finish with minimal finishing operations.

The MIM process, also known as Metal Injection Molding, is a manufacturing technique used to produce complex metal parts with high precision and intricate shapes. It combines the advantages of plastic injection molding and powder metallurgy to create near-net-shape components.

Here’s a simplified step-by-step overview of the MIM process:

1. Feedstock Preparation: Fine metal powders, typically less than 20 microns in size, are mixed with a binder material. The binder helps hold the metal powder particles together and allows them to be injected into the mold.

2. Injection Molding: The feedstock, now in the form of a paste-like material, is injected into a mold cavity using a specialized injection molding machine. The mold is typically made of steel and has the desired shape of the final part.

3. Debinding: After the component has been molded, it undergoes a debinding process to remove the binder material. This can be done through either a solvent-based or thermal debinding method, where the binder is selectively removed while leaving the metal powder intact.

4. Sintering: The debound component is then subjected to a sintering process. In this step, the component is heated in a controlled atmosphere to a temperature just below its melting point. The heat causes the metal particles to fuse together, resulting in a fully dense and solid metal part.

5. Post-Processing: After sintering, additional post-processing steps may be performed to achieve specific surface finishes, improve dimensional accuracy, or add further treatments like heat treatment or coating.

The MIM process offers several advantages, including the ability to produce complex, near-net-shape parts with high dimensional accuracy, excellent surface finish, and a range of material options such as stainless steel, titanium, and cobalt-chrome. It is widely used in various industries, including automotive, medical, aerospace, electronics, and consumer goods.

Sintering is a critical step in the Metal Injection Molding (MIM) process, where the shaped green parts are subjected to high temperatures to bond the metal particles together and achieve the desired density and mechanical properties.

During the sintering process, the green parts are placed in a furnace and heated to a temperature below the melting point of the metal used in the MIM process. The exact temperature and time depend on the specific material being processed.

As the temperature increases, several key phenomena occur during sintering:

1. Densification: As the temperature rises, the metal particles start to diffuse and come into contact with each other. This diffusion allows for the removal of voids and the welding of adjacent particles, resulting in densification of the part.

2. Neck Formation: Sintering promotes the formation of “necks” between the metal particles. These necks are small regions where adjacent particles are bonded together, forming a continuous solid structure.

3. Shrinkage: During sintering, the green parts undergo shrinkage due to the removal of binder materials and the rearrangement of metal particles. The extent of shrinkage depends on the material formulation and sintering conditions.

4. Grain Growth: Grain growth occurs when the metal particles grow in size during sintering. This can affect the final microstructure and mechanical properties of the part.

The sintering process requires careful control of temperature, time, and atmosphere to optimize the densification while minimizing deformations, distortions, and defects. Typically, protective atmospheres such as nitrogen or hydrogen are used to prevent oxidation and maintain the integrity of the metal.

After sintering, additional post-processing steps such as heat treatment, machining, and surface finishing may be performed to enhance the final properties and aesthetics of the MIM parts.

In summary, sintering in MIM is the process of heating the green parts to a temperature below the metal’s melting point, allowing for the bonding and densification of the metal particles to form the final solid component.

The main difference between casting and Metal Injection Molding (MIM) lies in the manufacturing processes and the properties of the final products. Here are the key distinctions:

1. Process: Casting involves pouring molten metal into a mold, allowing it to solidify and then removing the mold to obtain the final product. MIM, on the other hand, utilizes a powder metallurgy process where a mixture of fine metal powders and binders is injected into a mold. The molded part is then subjected to a debinding and sintering process to remove the binders and consolidate the metal powders.

2. Complexity: MIM is generally more suitable for complex geometries and intricate shapes compared to casting. The injection molding process allows for the production of parts with fine details, thin walls, and complex features, which can be challenging to achieve through traditional casting methods.

3. Material Variety: Casting can accommodate a wide range of materials, including various metals and alloys, while MIM is primarily used for smaller parts made from materials such as stainless steel, low-alloy steel, and other related materials. MIM offers a limited material selection compared to casting.

4. Mechanical Properties: MIM parts generally exhibit higher density and better mechanical properties compared to cast parts. The sintering process in MIM allows for the achievement of high part densities, resulting in improved strength, hardness, and dimensional accuracy. Cast parts may have lower density and can exhibit inherent defects, such as porosity or shrinkage, which can affect their mechanical performance.

5. Cost: For large-scale production runs, MIM can offer cost advantages over casting due to its ability to produce net-shaped parts with less material waste. However, for simpler, larger parts or low-volume production, casting may be a more cost-effective option.

Ultimately, the choice between casting and MIM depends on various factors, including part complexity, material requirements, desired properties, and production volume. Each method has its strengths and limitations, and selecting the appropriate manufacturing process depends on the specific needs of the application.

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