Effect of sintering temperature on the mechanical and physical properties of WC–10%Co through micro-powder injection molding (μPIM)

In this article, the fabrication steps of copper parts, using the powder injection molding method have been investigated. For the purpose of this study, first, several feedstocks were prepared by mixing copper powder (in volume percentages of 60, 64, 68, and 72%) and a thermoplastic binder. Due to the sensitivity of the mixing stage in the powder injection molding process, the Extrumixing method was utilized to appropriately mix the copper powder with the binder. Rheological characteristics of the different feedstocks were analyzed by means of a capillary rheometer. Based on this analysis, the feedstock having a 68 vol. % copper powder was selected as the optimum powder, out of which, samples shaped like tensile test specimens were successfully molded. These samples were later debinded by the solvent debinding method. Sintering of the pieces was carried out at different temperatures. Research showed that raising the sintering temperature leads to an increase of density and tensile strength of the specimens.

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Advantages and Limitations of Using Nano Sized Powders for Powder Injection Molding Process: A Review

Jurnal Teknologi ◽

10.11113/jt.v59.2579 ◽

2012 ◽

Vol 59 (2) ◽

Author(s):

Javad Rajabi ◽

Norhamidi Muhamad ◽

Abu Bakar Sulong ◽

Abdolali Fayyaz ◽

Azizah Wahi

Keyword(s):

Injection Molding ◽

Large Scale ◽

Sintering Temperature ◽

High Surface ◽

Volume Ratio ◽

Powder Injection Molding ◽

Nano Particles ◽

Powder Injection ◽

Injection Molding Process ◽

Molding Process

Powder injection molding (PIM) is among the most known forming techniques that use material powders. This technique has been widely evaluated for the production of large scale and small components using metal and ceramic powders. Nano particles have larger surface-to-volume ratio compared with large-sized particles, thus they display high surface area. Some merits in the application of nano-sized particles in the PIM process includes increasing its comparative density at a low sintering temperature, decreasing sintering temperature, decreasing grain size of sintered bodies, increasing hardness value, and improving surface properties. However, it also has several disadvantages, which include increasing the viscosity behaviour of feedstock, oxidation, and agglomeration. This article reviews current studies on the effects of nano-sized particles on the PIM process and finding solutions to address its disadvantages.

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Powder Injection Molding of Mullite: The Study of Mechanical and Physical Properties of the Sintered Products Using Statistical Methods

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.690.92 ◽

2016 ◽

Vol 690 ◽

pp. 92-96

Author(s):

Parinya Chakartnarodom ◽

Nuntaporn Kongkajun ◽

Nutthita Chuankrerkkul

Keyword(s):

Flexural Strength ◽

Injection Molding ◽

Statistical Methods ◽

Sintering Temperature ◽

Hypothesis Test ◽

Polyvinyl Butyral ◽

Powder Injection Molding ◽

Statistical Hypothesis ◽

Powder Injection ◽

Statistical Hypothesis Test

The aim of this work is to propose the application of statistical methods (linear regression and statistical hypothesis test) to analyze the effect of parameters used in powder injection molding including sintering temperature and the feedstock composition on the flexural strength, the porosity and the density of the sintered specimens of mullite prepared by powder injection molding (PIM) and using the composite binder consisting of 80 wt% polyethylene glycol (PEG) and 20 wt% polyvinyl butyral (PVB) for molding. The lab-scale plunger type PIM machine was used to prepare the specimens. The feedstock compositions were 50 to 54 vol% mullite, and the sintering temperatures were 1300 and 1400 °C. At level of significance 0.05 for statistical analysis, feedstock composition did not affect flexural strength, porosity, and density of the sintered specimens. For sintering temperature, the specimens sintered at 1400 °C have the greater density and the lower porosity. However, the flexural strength of the specimens sintered at 1300 °C and 1400 °C are statistically similar.

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Powder injection molding of a 17-4 PH stainless steel and the effect of sintering temperature on its microstructure and mechanical properties

Journal of Materials Processing Technology ◽

10.1016/s0924-0136(02)00739-2 ◽

2002 ◽

Vol 130-131 ◽

pp. 321-327 ◽

Cited By ~ 35

Author(s):

Hwan-Jin Sung ◽

Tae Kwon Ha ◽

Sangho Ahn ◽

Young Won Chang

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Injection Molding ◽

Sintering Temperature ◽

Powder Injection Molding ◽

Powder Injection ◽

Microstructure And Mechanical Properties

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Thermo-Physical Properties of SiCAl Composites with High Volume Fraction of Reinforcement Prepared by Combining Powder Injection Molding and Pressure Infiltration

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.1832 ◽

2011 ◽

Vol 239-242 ◽

pp. 1832-1837

Author(s):

Hao He ◽

Yi Min Li

Keyword(s):

Particle Size ◽

Injection Molding ◽

Physical Properties ◽

Volume Fraction ◽

High Volume ◽

Powder Injection Molding ◽

Powder Injection ◽

Pressure Infiltration ◽

Johnson Model ◽

Thermo Physical Properties

SiC/Al composites with high reinforcement content were fabricated by pressure infiltration of aluminum alloy into porous SiC preform obtained by powder injection molding using a bimodal powder mixture. The influence of powder loading and particle size on the thermo-physical properties of the prepared composites was investigated. The results indicate that the thermal conductivities (TC) increases and coefficients of thermal expansion (CTE) decreases with increasing powder loading and particle size of the coarse powders in the bimodal powder system. The TCs are below the estimated value based on Hasselman-Johnson model, mainly due to the residual pores and the irregular particle shape. The CTEs of the composites increase with increasing temperature from 100°C to 400°C, and the increasing rates vary at different temperature ranges. Deep cooling in liquid nitrogen is effective to bring dislocations in the matrix and thus reduces the CTEs.

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Production Method for Solid Oxide Fuel Cell Substrate Using Powder Injection Molding Process

ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 1 ◽

10.1115/esda2010-24572 ◽

2010 ◽

Author(s):

Amin Mirahmadi ◽

Mostafa Rezaee Saraji

Keyword(s):

Injection Molding ◽

Thermal Shock ◽

Sintering Temperature ◽

Powder Injection Molding ◽

Solid Oxide ◽

Powder Injection ◽

Injection Molding Process ◽

Oxide Fuel ◽

Power Cost ◽

High Efficient

Solid oxide fuel cells (SOFC) are a promising high-efficient power generating system that can directly convert chemical fuel to electrical power. Cost reduction of materials and processing is one of the key issues for commercialization of SOFCs. Powder injection molding is a good solution for producing low cost and defect free components and is adapted with mass production. In this study, effect of five powder loading and sintering temperature and holding time on porosity and thermal shock characteristics of SOFC substrate is investigated. Finally, the results show powder loading is not key factor in porosity and thermal shock characteristics and it is better to use high powder loadings. High sintering temperature for long time leads to high density sintered parts and are not suitable for SOFC substrate. All parts show high thermal shock characteristics.

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