Binder-Free Tungsten Carbide Fabricated by Pulsed Electric Current Sintering

Shimojima, Koji; Hosokawa, Hiroyuki; Nakajima, Takeshi; Mizukami, Masahiko; Yamamoto, Yoshiharu

doi:10.4028/www.scientific.net/MSF.534-536.1153

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HomeMaterials Science ForumProgress in Powder MetallurgyBinder-Free Tungsten Carbide Fabricated by Pulsed...

Binder-Free Tungsten Carbide Fabricated by Pulsed Electric Current Sintering

Abstract:

In this paper, we show some experimental results of binder-free WC sintered by Pulsed Electric Current Sintering (PECS) also known as Field Assisted Sintering Technology (FAST). These binder-free WC have extremely high hardness and stiffness. However, these mechanical properties are dependent on the sintering condition, e.g., maximum temperature, applied pressure, etc. We show some relationship between mechanical properties and sintering condition to improve to sinter the binder-free WC.

Info:

Periodical:

Materials Science Forum (Volumes 534-536)

Main Theme:

Progress in Powder Metallurgy

Edited by:

Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim

Pages:

1153-1156

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.534-536.1153

Citation:

K. Shimojima et al., "Binder-Free Tungsten Carbide Fabricated by Pulsed Electric Current Sintering", Materials Science Forum, Vols. 534-536, pp. 1153-1156, 2007

Online since:

January 2007

Authors:

Koji Shimojima, Hiroyuki Hosokawa, Takeshi Nakajima, Masahiko Mizukami, Yoshiharu Yamamoto

Keywords:

Binder-Free, Field Assisted Sintering, Micro-Die, Pulse Current Sintering, Tungsten Carbide

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Paper TitlePages

Effects on Inorganic Binder to Improve Strength and Hardness of α+ Al₁₈B₄O₃₃w/AC4CH Alloy Composites

Authors: Yong Bum Choi, Jae Woong Jung, Won Jo Park, Sun Chul Huh, Kwang Yong Lee, Han Ki Yoon, Gen Sasaki

Abstract: 20 vol.% aluminum borate whisker (Al18B4O33w) reinforced AC4CH alloy composite was fabricated by squeeze casting method. The matrix is controlled its impurities, which make metal alloys, especially AC4CH alloy that is made by restraining 0.2% Iron and aluminum to make a matrix material. The perform of composite materials was made from Al18B4O33w with 5% regulated three kinds of inorganic binders, SiO2, Al2O3 and TiO2 sol, respectively and then sintered at 1373K. The composites were obtained by squeeze cast infiltration of the molten alloy to the perform. Then it was squeeze casting into the matrix. The status of adhesions of whisker perform was Observed by SEM. Micro-Vickers hardness and tensile properties at the room temperature were estimated. Al18B4O33w/AC4CH composites containing TiO2 sol has excellent properties on tensile properties and micro-vickers hardness compared with the other composites without inorganic binder, containing SiO2 and Al2O3 sol inorganic binder.

1451

Fundamentals for Optimization of Binding for High Refractory Mullite Products

Authors: M.S. Başpınar, Wolfgang Schulle, Ferhat Kara

1787

Single Step of Binder Thermal Debinding and Sintering of Injection Moulded 316L Stainless Steel

Authors: Indra Putra Almanar, Zuhailawati Hussain, Mohd Afian Omar

Abstract: Metal injection moulding was performed with gas atomized 316L stainless steel powders. Feedstocks were prepared using a paraffin wax/polyethylene/stearic acid binder system and subsequently molded into tensile bar specimens. Solvent extraction done at 80○C has shortened the debinding process to 30 minute. Single step of thermal binder debinding and sintering was done in a vacuum furnace. Sintering at 1380○C has reduced the porosity and associated with grain growth that result in an increase in ultimate tensile strength to 444 MPa while the elongation increased to 29% before fracture.

1518

Cobalt-Based Binders and the Efficiency of Diamond Saw Blades

Authors: Guerold Sergueevitch Bobrovinitchii, Marcello Filgueira, Sérgio Neves Monteiro, Rômulo Crespo Tardim

Abstract: Powder metallurgy-based technologies of saw blades production for stone cutting normally uses cobalt as binder agent. Cobalt was chosen for that purpose because it provides improved properties, high wettability and good adhesion between dispersed diamond particles. In addition to its excellent physical properties, cobalt also shows a positive behavior associated with the control of diamond graphitization at temperatures up to 1000°C. In this work, an experimental planning method supported by a mathematical algorithm was used to study the influence of doping agents incorporated into cobalt-based binders. The consequences on the wear resistance of saw blades, as well as on other physical and mechanical properties of the “diamond-cobalt-doping agent” composites were investigated. Cr3C2, Si, Ni and Fe were used as doping agents. Experimental tests were carried out using granite as a base material for wear and cutting operations.

182

Fabrication of Injection Moulded 304L Stainless Steels Reinforced with Tungsten Carbide Particles

Authors: Nutthita Chuankrerkkul, Parinya Chakartnarodom

Abstract: Powder injection moulding of 304L stainless steel - tungsten carbide (WC) composites were carried out in the present work. Two different WC particle i.e. WC having average size of 4.8 µm and 1.6 µm were used. Feedstock of powder loading up to 55 vol% were successfully prepared using binder composed mainly of polyethylene glycol (PEG) and a minor constituent of polymethylmethacrylate (PMMA). The mouldings were leached in water at temperatures of 40 °C and 60 °C from 30 minutes to 24 hours in order to study the effect of leaching conditions on the removal of the PEG. The remaining binder, PMMA, provided strength to the mouldings after leaching of the PEG and it could be removed by pyrolysis during ramping up to the sintering temperature. Specimens were sintered under hydrogen atmosphere at 1250 °C for 1 hour. Sintered components were subjected to testing and characterisation. Scanning electron microscope was used to observe microstructure of specimens after moulding, leaching and sintering. It was found that the hardness of the sintered specimens increased with either increasing the amount of the powder loading in the feedstock or reducing the average size of WC in the powder mixture. In addition, the water leaching of the PEG linearly correlates with the natural log of time and the equation predicts that PEG will be removed completely in 11.24 ± 1.31 hours which corresponds with the experiment result that PEG completely removed in 12 hours.

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