metal injection moulding

MIM Technology
Metal Injection Molding (MIM) technology combines the shape making capabilities of plastic injection molding with the material flexibility of powder metallurgy. Taking advantage of unique process capabilities, it allows one complex geometry or co-molding and bonding dissimilar materials. Combining fine metal powders with a binder system, components are injection molded, de-bound and sintered, resulting in high-density, complex, precisely-shaped parts exhibiting properties approaching that of wrought material. Alloy and stainless steel, as well as other non-ferous alloys such as titanium, are common materials for MIM.
MIM is used by many industries , such as medical device, telecom, electronics and automotive parts manufacturers, and is a viable and cost effective alternative to other types of metal processes, such as machining and casting. The MIM process is particularly well suited for the high-volume manufacture of relatively small, complex components requiring high strength, high performance and cost efficiency.
MIM Process
1. FEEDSTOCK. The metal powder is mixed with thermoplastic binders to produce a homogeneous feedstock; with approximately 60 volume % metal powder and 40 volume % binders.
2. INJECTION MOLDING. The feedstock is placed into an injection molder and
molded to form a net shape green part. Injection molding occurs at relatively low temperatures and pressures inconventional plastic injection molding machines. The molds are similar to those used for plastic injection molding including slides and multi-cavity configurations.
3. DEBINDING. After injection molding , the binder is removed from the green part via an evaporative process called debinding.
4. SINTERING. After debinding the part is sintered to form a high-density metal part.Sintering occurs at high temperatures, up to 1260 ¡ãC (2300 ¡ãF), near the melting point of the metal; under a dry H2 atmosphere or inert gas atmosphere. During sintering, the part will shrink isotropically to form a dense shape. Since, the complex shape of the molded part is retained through the process, close tolerances in the as-sintered part can be achieved. Scrap is eliminated or significantly reduced since machining of the part after sintering is usually not necessary. Certainly, the sintered part can be processed with heat treatment, machining or other means to achieve some special performance.
Advantages of MIM
High Shape Complexity: MIM process can produce more complex parts than either investment casting or traditional press and sinter techniques.
Low Cost: Machining operations can be eliminated.
Tight Tolerances: Dimensions of parts produced with our feedstock can be held to +/- 0.001~0.002" per inch.
High Density: MIM parts produced with our feedstock will have density levels between 97.5-99.5%. These l levels typically exceed traditional press and sinter techniques.
High Performance: The tensile strengths, elongations and hardness are superior to traditional press and sinter techniques, and comparable to investment casting or machine components.
Typical Mechanical Properties of MIM Alloys
Material Designation Code
Density
Hardness
Tensile Strength
Elongationg/cm3
HR
Mpa
%Low Alloy Stele
MIM-2200
7.65
45HRB
290
40(As-sintered Condition)MIM-2700
7.65
69HRB
440
26(As-sintered Condition)MIM-4605
7.62
62HRB
415
15(As-sintered Condition)MIM-4605
7.62
48HRB
1655
2(Heat Treated Condition)Stainless 
MIM-316L
7.92
67HRB
520
50Steel
(As-sintered Condition)
MIM-17-4PH
7.5
27HRB
900
6
(As-sintered Condition)
MIM-17-4PH
7.5
40HRB
1185
6
(Heat Treated Condition)
MIM-430L
7.5
65HRB
415
25
(As-sintered Condition)Tungsten 
95%W-Ni-Fe
18.1
25HRB
960
25Alloy
97%W-Ni-Fe
18.1
30HRB
940
15Hard Alloy
YG8X
14.9
HRA90
(Transverse 
/Rupture Strength)2300Soft Magnetic Alloy
MIM-2200
7.6
/
290
40MIM-Fe-50%Ni
7.7
/
455
30MIM-Fe-3%Si
7.45
/
530
24MIM-Fe-50%Co
7.7
/
205
<1.0MIM-430L
7.5
/
415
25
Application
Automotive Industry
Electronics and Telecom
Medical Devices
Firearms Industry
Consumer Products
Mechanical Industry
Tools
More Applicationsignition ontrol module
hard disc drive parts
orthodontic brackets
small arms parts
watchcase
cutting tool
drillstock
precision valveairbag sensor module
electronic packaging
radiation protection shield
armour-piercing bullet core
watch chain
micro gear wheel
arc tooth
pumpbrake component
printing head
surgical scalpel
high energy bullet
watch hammer
special three-dimensional parts
blade clamp
mold coreturbo
heat sink material
implanted devicesgolf head covercoupling device
......magnet sensor seat
cable connector
fishing gear partsmultifunctional tool
pressure control
mobile phone hinge
lock parts & flowmeter component of fuel injection systempothook of driving system
laptop hingeengine rocker
mobile phone crustoxygen sensor of&nbs

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Shandong Yongtai Steel Technology Co., Ltd. is in high and new-technology development zone, Tai' an, Shandong, P.R. China. Our company occupies 300,000 sq. m. which contains 200,000 sq. m. construction area.


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