Recent advances in PIM technology I

In this article the state of art of the PIM (Powder Injection Moulding) technology is given in brief. The main process flow diagram consisting of four steps: feedstock preparation, injection moulding (green samples forming), the debinding (binder removing) procedure and the sintering process was described. After that the materials for binders and additives for the surface active agents were mentioned in brief. The metal injection moulding (MIM) process was analysed in more detail: MIM- stainless steels, MIM-copper and MIM-aluminium as the most metals common in MIM metal parts production. After that our results of MIM stainless steel 316 L and MIM copper are given. The main powder characteristics, the shrinkage and density of the sintered samples were compared for isostatically pressed PM (powder metallurgy) samples and MIM formed samples. The SEM fractographs of MIM and PM samples are given for MIM green parts, debinded (brown) parts and sintered parts, and PM green parts and sintered parts. The results obtained were compared with literature data before they were applied in metal parts production.

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Recent advances in PIM technology I

Science of Sintering ◽

10.2298/sos0801079z ◽

2008 ◽

Vol 40 (1) ◽

pp. 79-88 ◽

Cited By ~ 15

Author(s):

B.S. Zlatkov ◽

E. Griesmayer ◽

H. Loibl ◽

O.S. Aleksic ◽

H. Danninger ◽

...

Keyword(s):

Injection Moulding ◽

Flow Diagram ◽

Powder Injection ◽

Main Process ◽

Metal Parts ◽

Surface Active Agents ◽

Powder Injection Moulding ◽

Powder Characteristics ◽

Feedstock Preparation ◽

Stainless Steel 316

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The effect of powder characteristics on pressure sensitivity of powder injection moulding compounds

Powder Technology ◽

10.1016/j.powtec.2010.08.065 ◽

2011 ◽

Vol 206 (3) ◽

pp. 209-213 ◽

Cited By ~ 8

Author(s):

Berenika Hausnerova ◽

Tomas Sedlacek ◽

Petr Filip ◽

Petr Saha

Keyword(s):

Injection Moulding ◽

Powder Injection ◽

Pressure Sensitivity ◽

Powder Injection Moulding ◽

Powder Characteristics

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Identification of the effects of key powder characteristics on powder injection moulding

Metal Powder Report ◽

10.1016/0026-0657(92)91953-h ◽

1992 ◽

Vol 47 (10) ◽

pp. 55 ◽

Cited By ~ 1

Author(s):

R.M. German ◽

K.H. Hens

Keyword(s):

Injection Moulding ◽

Powder Injection ◽

Powder Injection Moulding ◽

Powder Characteristics

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Powder Injection Moulding of Alumina Using PEG/PVB Binder Systems

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.545.173 ◽

2013 ◽

Vol 545 ◽

pp. 173-176 ◽

Cited By ~ 6

Author(s):

Nutthita Chuankrerkkul ◽

Pat Sooksaen ◽

Piyawan Pakunthod ◽

Tutiyachan Kosalwit ◽

Wanwara Pinthong

Keyword(s):

Injection Moulding ◽

Removal Rate ◽

Minor Component ◽

Polyvinyl Butyral ◽

Major Constituent ◽

Powder Injection ◽

Alumina Powder ◽

Water Leaching ◽

Powder Injection Moulding ◽

Feedstock Preparation

Powder injection moulding (PIM) is a process that is suitable for a fabrication of small and complex shape components. It consists of 4 main steps: feedstock preparation by mixing powder and binder, injection moulding of the prepared feedstock into the desired mould, removal of the binder and finally sintering to obtain materials with specific properties. In this study, powder injection moulding of alumina (Al2O3), using polyethylene glycol (PEG) based binder systems, was investigated. PEG is soluble in water; therefore, the use of organic solvents required for debinding of wax-based binder system can be avoided. PEG with a molecular weight of either 1500 or 4000 was used as a major constituent together with polyvinyl butyral (PVB) as a minor component. Stearic acid was also added during feedstock preparation to act as a lubricant. After mixing the powder with the binder, a variety of Al2O3 feedstocks were injected into the moulds. The mouldings were prepared by a laboratory-scaled plunger-typed machine. Debinding was carried out using a combination of solvent extraction and thermal debinding. Water leaching tests were performed at 30 and 50 °C to study PEGs removal rate. The pyrolysis of PVB was completed during ramping up of the mouldings to the sintering temperature. The mouldings were subjected to sintering at 1500 °C in air. It was found from the study that PEG/PVB binder systems can be used for the preparation of alumina powder injection moulding feedstocks. Specimens retained their shapes during and after leaching of the PEGs.

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Recent advances in CIM technology

Science of Sintering ◽

10.2298/sos0802185z ◽

2008 ◽

Vol 40 (2) ◽

pp. 185-195 ◽

Cited By ~ 7

Author(s):

B.S. Zlatkov ◽

E. Griesmayer ◽

H. Loibl ◽

O.S. Aleksic ◽

H. Danninger ◽

...

Keyword(s):

Injection Moulding ◽

Barium Hexaferrite ◽

Powder Injection ◽

Medical Applications ◽

Electrical Characteristics ◽

Powder Injection Moulding ◽

Ceramic Components ◽

Technical Ceramics ◽

Powder Characteristics ◽

Ceramic Injection Moulding

In this article the PIM (Powder Injection Moulding) technology is described in brief. After that the benefits and advantages were analyzed and summarized. Ceramic injection moulding (CIM) process was analyzed in more detail: CIM- alumina, CIM-zirconia and CIM ferrites as the most common technical ceramics in CIM ceramic parts production, medical applications and accessories in chemical laboratories, and cores in electronic inductive components. After that our results for CIM barium hexaferrite and piezo ceramics (barium titanate) are given. The main powder characteristics, the shrinkage and density and the main electrical characteristics of the sintered samples were compared for the isostatically pressed PM (powder metallurgy) and CIM formed samples. SEM fractographs of CIM and PM samples are given for CIM green parts, debinded (white) parts and sintered parts, and PM green parts and sintered parts. The results obtained were compared to literature data before they were applied in ceramic components production.

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