RESEARCH ON SHAPING TECHNOLOGY OF NANOCOMPOSITE WC-6Co POWDER AND PROPERTIES OF SINTERED COMPACTS

2006 ◽  
Vol 05 (02n03) ◽  
pp. 233-238 ◽  
Author(s):  
XIAOLIANG SHI ◽  
GANGQIN SHAO ◽  
XINGLONG DUAN ◽  
RUNZHANG YUAN
Keyword(s):  
Rupture Strength ◽  
Hot Isostatic Pressing ◽  
High Hardness ◽  
Cold Isostatic Pressing ◽  
Sintered Specimen ◽  
Volume Distribution ◽  
Vacuum Sintering ◽  
Transverse Rupture Strength ◽  
Isostatic Pressing ◽  
Die Pressing

The influences of powder extrusion molding (PEM), die pressing and cold isostatic pressing (CIP) on the green compacts and the sintered compacts of nanocrystalline WC-6 Co composite powder produced by spray pyrogenation-continuous reduction and carburization technology were researched. The results showed that the pore volume distribution, density and scanning electron microscopy (SEM) morphologies of fractured surface of powder extrusion molding or die pressing followed by the cold isostatic pressing consolidation green compacts were better than that of powder extrusion molding or die pressing. The green compacts were sintered by using vacuum sintering plus hot isostatic pressing (HIP), the sintered specimens were characterized by testing density, Rockwell A hardness, saturated magnetization, coercivity force, transverse rupture strength (TRS) and atomic force microscope (AFM) images, the results showed that sintered specimen of the green body that prepared by powder extrusion molding or die pressing followed by cold isostatic pressing had excellent properties of high strength and high hardness, transverse rupture strength of sintered specimen was more than 3100 MPa, Rockwell A hardness of sintered body was more than 93. Ultrafine WC-6 Co cemented carbide rods with excellent mechanical properties and fine microstructure were obtained.

scholarly journals Combustion Synthesis of TiC-TiB2-Based Cermets from Elemental Powders

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Jun Yu ◽  
Kiyotaka Matsuura ◽  
Munekazu Ohno
Keyword(s):  
Combustion Synthesis ◽  
Powder Mixture ◽  
Modulus Of Elasticity ◽  
Bonding Strength ◽  
Rupture Strength ◽  
Volume Ratio ◽  
High Hardness ◽  
Transverse Rupture Strength ◽  
Isostatic Pressing ◽  
Very High

TiC-TiB2-based cermets with Ni binder were fabricated using combustion synthesis assisted by pseudohot isostatic pressing by heating the compacted powder mixture to approximately 700°C. The effects of composition on microstructure and hardness of the synthesized samples were investigated. The samples exhibited finer microstructure and higher hardness as TiC/TiB2volume ratio increased and as Ni increased up to 30 vol%. A relatively high hardness value of 1950 HV was obtained for TiC-TiB2-Ni(52.5/17.5/30 vol%). However, the transverse rupture strength and the modulus of elasticity values were not very high. This may be due to weak bonding strength of the interface between hard phases and Ni binder and/or insufficient densification of the samples.

Nd:YAG transparent ceramics fabricated by direct cold isostatic pressing and vacuum sintering

2015 ◽  
Vol 50 ◽  
pp. 25-31 ◽  
Author(s):  
Lin Ge ◽  
Jiang Li ◽  
Zhiwei Zhou ◽  
Binglong Liu ◽  
Tengfei Xie ◽  
...  
Keyword(s):  
Cold Isostatic Pressing ◽  
Transparent Ceramics ◽  
Vacuum Sintering ◽  
Isostatic Pressing

Effect of Cold Isostatic Pressing on the Mechanical Properties of WC-8Co Cemented Carbide for Friction Stir Welding Tool

2014 ◽  
Vol 563 ◽  
pp. 107-111
Author(s):  
Chen Zhang ◽  
Bing Liang Liang ◽  
Yun Long Ai ◽  
Chang Hong Liu
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Relative Density ◽  
Cold Isostatic Pressing ◽  
Cemented Carbide ◽  
Vacuum Sintering ◽  
Pressing Method ◽  
Isostatic Pressing ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties

WC-8Co cemented carbide specimens were prepared via vacuum sintering. The effects of cold isostatic pressing (CIP) on microstructure and mechanical properties were investigated. The results show that only WC and Co3W3C (γ-phase) were detected by XRD without any else phases, even though Co. Dense WC-8Co cemented carbide samples were obtained and relative density reached over 98%. The pressing method, instead of pressure, took an important role in the mechanical properties of WC-8Co cemented carbide. KIC and TRS of WC-8Co cemented carbide were improved at least 27% and 24%, respectively, by the use of CIP. WC-8Co cemented carbide with excellent mechanical properties (HRA>93.5, KIC>11MPa·m1/2, TRS>870MPa) was obtained by using CIP.

Development Modes of Prior Free Sintering to Form a High-Density Fine Grain Ceramics after HIP

2014 ◽  
Vol 698 ◽  
pp. 457-460 ◽  
Author(s):  
Sergey Veselov ◽  
Natalya Belousova ◽  
Roman Timarevskiy ◽  
Nina Cherkasova
Keyword(s):  
Physical Properties ◽  
Structural Investigation ◽  
Hot Isostatic Pressing ◽  
Cold Isostatic Pressing ◽  
High Density ◽  
Isostatic Pressing ◽  
Fine Grain ◽  
Time Parameters ◽  
Temperature Time

In this paper the two methods of pre-operation green samples to hot isostatic pressing (HIP) were investigated. The influence the method of formation (uniaxial and cold isostatic pressing) and the temperature-time parameters on property of samples was analyzed. Structural investigation was carried out and physical properties of samples were defined. The recommendations for pre-operation and uses of sintering modes samples for HIP were given.

Mechanical Properties of WC-Co Cemented Carbide Prepared via Vacuum Sintering

2013 ◽  
Vol 275-277 ◽  
pp. 1917-1920
Author(s):  
Bing Liang Liang ◽  
Yun Long Ai ◽  
Chang Hong Liu ◽  
Nan Jiang
Keyword(s):  
Mechanical Properties ◽  
Phase Composition ◽  
Relative Density ◽  
Sintering Temperature ◽  
Rupture Strength ◽  
Cemented Carbide ◽  
Vacuum Sintering ◽  
Transverse Rupture Strength ◽  
Temperature Range ◽  
Peak Value

WC-Co cemented carbide specimens were prepared via vacuum sintering. The influences of composition and sintering temperature on phase composition, microstructure and mechanical properties of WC-Co cemented carbide were investigated. The results show that dense specimens were obtained in the sintering temperature range of 1280~1400°C and the relative density reached over 95%. Only WC and Co3W3C (-phase) were detected by XRD without any else phases, even though Co. With the ascended sintering temperature, hardness increased and the transverse rupture strength (TRS) ascended to peak value and then descended. WC-Co cemented carbide with excellent mechanical properties (HRA>90, TRS~700MPa and KIC>10MPa•m1/2) were obtained.

Influence of Tempering Temperature in Wear of AISI T15 HSS Tools Produced by HIP and Liquid Phase Vacuum Sintering

2010 ◽  
Vol 1276 ◽  
Author(s):  
Emmanuel P. R. Lima ◽  
Maurício D. M. das Neves ◽  
Sérgio Delijaicov ◽  
Francisco A. Filho
Keyword(s):  
Liquid Phase ◽  
Electrical Discharge Machining ◽  
Rupture Strength ◽  
Hot Isostatic Pressing ◽  
Steel Plates ◽  
Machining Process ◽  
Vacuum Sintering ◽  
Tempering Temperature ◽  
Tools Wear ◽  
1045 Steel

AbstractThis work aims to investigate the influence of tempering temperature in the wear resistance of AISI T15 HSS tools produced by two different sintering processes – hot isostatic pressing (HIP) and liquid phase vacuum sintering. All materials are submitted to annealing at 870°C, quenching at 1210°C and triple tempering at 540, 550 and 560 °C. Density measurements, hardness and bend strength (transversal rupture strength – TRS) tests are accomplished. To identify the present phases and to evaluate the obtained microstructures, analysis in optical microscopy, SEM and EDX are done. Interchangeable inserts are manufactured by electrical discharge machining process. Frontal machining without coolant of normalized AISI 1045 steel plates is employed. The cutting forces are monitored via a transducer basically constituted of an instrumented table with four load cells mounted with “Strain Gages” sensors capable to measure the cutting efforts. The tools wear is analyzed and used to estimate the performance of two different HSS tools. For both investigated materials, the tools tempered at 540 °C show the lowest wearing.

Effect of Oxygen Content in Powders on Microstructure and Mechanical Properties of WC-FeAl Composites Fabricated by Vacuum Sintering Technique

2015 ◽  
Vol 1088 ◽  
pp. 115-119 ◽  
Author(s):  
Ryoichi Furushima ◽  
Kiyotaka Katou ◽  
Koji Shimojima ◽  
Hiroyuki Hosokawa ◽  
Akihiro Matsumoto
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Oxygen Content ◽  
Rupture Strength ◽  
Powder Preparation ◽  
Vacuum Sintering ◽  
Transverse Rupture Strength ◽  
Sintered Composite ◽  
Lower Oxygen ◽  
Effect Of Oxygen

WC-FeAl composites were fabricated by vacuum sintering technique from mixture of WC and FeAl powders containing various oxygen content. Mechanical properties such as hardness, fracture toughness and transverse rupture strength were influenced by the oxygen content in the powders. Control of the oxygen content was succeeded by changing the powder preparation process. Contrary to expectations, the reduction of oxygen content led to degrade the fracture toughness and transverse rupture strength of the composites. This result was attributed to the microstructural change in the sintered composite. The sintered composite of lower oxygen content exhibited WC grain growth or inhomogeneous microstructure, which can be the cause of degradation of those mechanical properties. It was concluded that the oxygen content was one of the key factors to influence the microstructure or mechanical properties of WC-FeAl composites.

Microstructures and Properties of Cu–AISI304 Parts Fabricated by Improved Selective Laser Sintering

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Z. L. Lu ◽  
J. H. Liu ◽  
Y. S. Shi
Keyword(s):  
High Performance ◽  
Selective Laser Sintering ◽  
Hot Isostatic Pressing ◽  
Processing Parameters ◽  
Laser Sintering ◽  
Cold Isostatic Pressing ◽  
Isostatic Pressing ◽  
Cu Content ◽  
Mechanical Performances ◽  
Liquid Sintering

For fabricating complex AISI304 parts with high performance by advanced powder/metallurgy technologies, cold isostatic pressing (CIP) is introduced into selective laser sintering (SLS) combined with hot isostatic pressing (HIP), which is abbreviated to selective laser sintering/isostatic pressed (SLS/IP). The effect of processing parameters on the densification of Cu–AISI304 parts is analyzed and then the influence of Cu on their relative densities, metallurgical structures, and mechanical performances are investigated. The results show that relative densities of Cu–AISI304 parts fabricated by SLS/IP are mainly influenced by CIP pressure and sintering temperature, and it is interesting to find that the formula 1−D=(1−D0)e−kP is testified by the CIP of SLS/IP. There is an antidensification phenomenon resulting from Cu and AISI304 in liquid sintering, but the relative densities of Cu–AISI304 parts can be gradually improved in HIP with Cu content increasing from 1 wt % to 3 wt %. After the above-mentioned Cu–AIS304 parts are finally hot isostatic pressed, their metallurgical structures consist of sosoloid (Cu,Ni) and (Fe,Ni) besides austenite (Fe,Cr,Ni,C), their best mechanical performances are close to those of solution treated compact AISI304 when Cu content is 3 wt %.

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