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MIM (Metal Injection Moulding)

Metal injection moulding (MIM) is a hybrid technology whereby it integrates the shaping capability of plastic injection moulding and materials flexibility of conventional powder metallurgy.

MIM is preferred for mass manufacturing of small, intricate geometry components of a variety of materials as it can achieve 95% to 98% dense, as good as wrought condition.

The Technology



The initial step to MIM is material selection and preparation. Once the appropriate combinations of metal powder blended and binders compounded into an injection mouldable feedstock.

Using an injection-moulding machine, the parts produced are then subjected to a binder removal process. Depending upon the type of binder used, different methods of debinding are applied.

The parts, after debinding, will then go through a sintering process.

The Materials



Due to the flexibility of MIM technology, DYT is able to customise material compositions according to the specific attributes required by the customers. (See Tables 1 and 2 for material compositions and physical properties.)

Table 1: Material Composition
Types Properties


C Cr Ni MnMo Si V W Co Cu Nb+Ta Fe
Stainless Steels 17-4PH
304L
316L
317L
430L
440C
F75
<0.07
<0.03
<0.03
<0.03
<0.03
0.9-1.2
<0.1
15-16
18-20
16-18
18-20
16-18
16-18
27-30
4-5
9-13
12-15
13-15
<1
<0.6
<1
<1
<2
<2
<0.5
<0.5
<1
<1


2-3
3-4

<0.75
5-7
<1
<1
<1
<1
<1
<1
<1



3-4






<0.45






Bal.
Bal.
Bal.
Bal.
Bal.
Bal.
<0.75
Low Alloy Steels 4140
8620
0.38-0.45
0.18-0.25
0.9-1.2
0.4-0.6

0.4-0.7

0.2-0.3
0.2-0.3






Bal.
Bal.
Carbon Steels Low
Medium
High
<0.2
0.2-0.5
>0.5


<1
<1
<1

<1
<1
<1





Bal.
Bal.
Bal.
Ni-Alloys FeNi2
FeNi8
FeNi50
Kovar
0.6-0.8
0.4-0.6
<0.1
<0.015



<0.5
1.8-2.2
7.5-8.5
49-51
29-30



<0.2

<1
<1
<0.5
<0.3





16-17


Bal.
Bal.
Bal.
Bal.
Tool Steels M2
SKDII
0.8-1.0
1.4-1.6
3.5-4.5
11-13
<0.3
<0.5
<0.4
<0.6
4.5-5.5
0.8-1.2
<0.5
<0.4
1.8-2.2
0.2-0.5
5.5-6.5
<0.25
<0.25

Bal.
Bal.
Tungsten Alloy WHA <0.03
4.8-5.2



93-94


1.8-2.2
Table II: Typical Physical Properties of MIM Materials
Types Mechanical Properties (minimum value)


Density (g/cm3) 0.2% Yield Strength
(MPa)
UTS
(MPa)
Elongation
(%)
Hardness
(HV300gf)
Stainless Steels 17-4PH
304L
316L
317L
430L
440C
F75
7.60
7.80
7.85
7.85
7.55
7.55
7.60
550
205
210
240
205
1900
427
950
515
510
540
415
1970
724
6
35
40
35
30
2
14
320
120
120
150
120
550
264
Low Alloy Steels 4140
8620
7.40
7.40
400
400
650
650
3
3
130
190
Carbon Steels Low
Medium
High
7.70
7.60
7.40
150
250
400
250
400
700
25
5
2
80
130
320
Fe-Ni Alloys FeNi2
FeNi8
FeNi50
7.60
7.70
8.05
150
200
250
250
350
400
25
15
20
90
100
120
Low Thermal Exp Kovar 7.70 - - - 150
Tool Steel M2 8.05 1000 1100 1 520
Tungsten Alloy WHA 18.0 - - - 450

The Applications



MIM technology has found increasing applications in the commercial world, from home appliances to watches, automobiles to aerospace, medical to weaponry.

The Advantages



Greater design freedom

With MIM, parts can be designed and manufactured without any design restrictions. In addition, almost all design changes are possible within the shortest development cycle and turnaround time.

Miniaturisation

MIM technology is the best viable process for producing miniature parts economically.

Complex and Intricate Shaped Parts

MIM is ideal for producing complex-shaped components as well as parts that require assembly or multiple steps to put together.

Corporate Video


In this video, learn how Dou Yee Technologies established themselves as the leading components and Powder Injection Moulding company in South East Asia since 1996.


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