Warm Compacting Behavior of Pure Titanium Powders

2011 ◽  
Vol 189-193 ◽  
pp. 2775-2779 ◽  
Author(s):  
Shi Wen He
Keyword(s):  
Pure Titanium ◽  
Compression Force ◽  
Cold Compaction ◽  
Densification Mechanism ◽  
Warm Compaction ◽  
Ejection Force ◽  
Titanium Powders ◽  
Compacting Pressure

Warm compacting behaviors of pure titanium powders were studied. The results show that warm compaction can be applied to titanium powders. The green densities obtained through warm compaction are generally higher than obtained through cold compaction at the same pressure. The optimal warm compacting temperature is about 140 . At the compacting pressure of 500 Mpa, the ejection force of titanium powders through warm compaction is 32.4% lower than through cold compaction. At the same pressure, the effective compression force through warm compaction is bigger than one through cold compaction. In addition, the densification mechanism of warm compaction was discussed.

Investigation on the Densification Mechanism of Warm Compaction

2007 ◽  
Vol 539-543 ◽  
pp. 2699-2705 ◽  
Author(s):  
Zhi Yu Xiao ◽  
Tungwai Leo Ngai ◽  
Yuan Yuan Li
Keyword(s):  
Plastic Deformation ◽  
High Performance ◽  
High Density ◽  
Forming Process ◽  
Cold Compaction ◽  
Densification Mechanism ◽  
Warm Compaction ◽  
Particle Rearrangement ◽  
Powder Particles ◽  
Dominant Phase

Warm compaction is a low cost process to make high density and high performance iron base powder metallurgy parts. Based on results obtained from the dynamic compacting curve, ejection force curve, X-ray diffraction, micro-hardness of iron powder, friction condition and lubricant properties, densification mechanism of warm compaction can be drawn. In the initial stage, the rearrangement of powder particles is the main factor. It contributes more in the densification of warm compaction than that in cold compaction. However, in the later stage, the plastic deformation of powder particles is the primary factor. The increase in plasticity at high temperature can harmonize the secondary rearrangement of powder particles. During the compaction, the polymer lubricant has great contribution to the densification of the powder, since it improves the lubricating condition and effectively decreases the friction in the forming process and thus enhances the compact density. The dynamic compacting curve of warm compaction can be divided into three phases. The first is the particle rearrangement dominant phase; the percentage of particle rearrangement in warm compaction is higher than that in cold compaction by 15-31%. The second is the elastic deformation and plastic deformation dominant phase. The third is the plastic deformation dominant phase. The study of the powder densification mechanism can direct engineers in designing and producing warm compaction powders for high density parts.

Warm Compacting Behaviors and Sintering Performance of 316L Stainless Steel Powder

2012 ◽  
Vol 538-541 ◽  
pp. 1088-1091
Author(s):  
Mei Yuan Ke
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
316L Stainless Steel ◽  
Sintered Density ◽  
Steel Powder ◽  
Nitrogen Atmosphere ◽  
Green Density ◽  
Cold Compaction ◽  
Warm Compaction ◽  
Made In

Warm compacting behavior and sintering performance of 316L stainless steel powders were studied. Results showed that green density and strength of samples made in warm compaction were much higher than that in cold compaction. Under pressure of 700MPa, green density and strength in warm compaction were 7.01 g•cm-3and 30.7MPa, which were higher than cold compaction by 0.19 g•cm-3and 10.7MPa. When sintered in hydrogen-nitrogen atmosphere for 60 minutes, sintered density, tensile strength and elongation all increased with the rise of sintering temperature. At 1300°C, Sintered density, tensile strength and elongation were 7.42 g•cm-3, 545MPa, 28.0%, respectively.

Titanium Powder Processing with Binder Addition for Biomedical Applications

2005 ◽  
Vol 498-499 ◽  
pp. 173-178 ◽  
Author(s):  
Marize Varella de Oliveira ◽  
L.C Pereira ◽  
Carlos Alberto Alves Cairo
Keyword(s):  
Biomedical Applications ◽  
Powder Processing ◽  
Pure Titanium ◽  
Porous Structures ◽  
Porous Coatings ◽  
Surgical Implants ◽  
Titanium Powders ◽  
Strong Attachment ◽  
Porosity Characterization

Porous structures are applied as coatings in order to improve surgical implants bone fixation by allowing the mechanical interlocking of the pores and bone. Sintered titanium porous coatings have been used for surgical implants because they have a strong attachment of the coating to the substrate. This works reports the processing and characterization of titanium porous coatings and foam samples, for surgical implants applications. Pure titanium powders mixed with urea as a binder was used for the porous coatings and foam samples. A rod shape of Ti-6Al-7Nb alloy P/M sample was used as substrate. Coatings surfaces were analyzed via scanning electron microscopy and the porosity characterization was made by quantitative metallografic analysis. It was found that coating porosity can be controlled by adjusting the binder percent addition and powder sizes. Sintered samples exhibited a microstructure with micropores and inteconnected macropores which is suitable to be used in surgical implants.

Characterization of Titanium Powders Processed at Different Temperatures

2014 ◽  
Vol 802 ◽  
pp. 512-517
Author(s):  
A.A. Ribeiro ◽  
R.M. Balestra ◽  
T.S. Barros ◽  
S.S. Carvalho ◽  
L.R. Guzela ◽  
...  
Keyword(s):  
Pure Titanium ◽  
High Hardness ◽  
Processing Route ◽  
Hardness Tests ◽  
Bone Powder ◽  
Complex Shapes ◽  
Different Temperatures ◽  
Titanium Powders ◽  
Good Biocompatibility

Titanium is the most adequate metallic material for orthopedic or dental implants fabrication, due to a very favorable combination of properties, when compared with other metals, such as good corrosion resistance, good mechanical properties, relatively low density, elasticity modulus close to that of bone and good biocompatibility, which assures good adhesion/integration to bone. Powder metallurgy has been used for titanium based implants fabrication due to advantages such as the production of more complex shapes and reduction of machining operation. In this work, compacted pure titanium powders, consolidated by rolling at different temperatures, were characterized by means of optical microscopy, Field Emission Scanning Electron Microscopy (FESEM) with Electron Back Scattering Diffraction (EBSD) analysis, automatic image analysis and hardness tests. The hardness of rolled samples increased from 200 to 400oC , which indicated that 300 to 400°C is the most adequate temperature range for this processing route, since it allowed obtaining low porosity with satisfactory and relatively high hardness.

Effect of plating on consolidation of commercially pure titanium powders

2013 ◽  
Vol 17 (sup2) ◽  
pp. s85-s89 ◽  
Author(s):  
R. Thyagarajan ◽  
G. M. D. Cantin ◽  
C. J. Bettles ◽  
N. A. Stone ◽  
B. P. Kashyap
Keyword(s):  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Titanium Powders

Die Wall Lubricated Warm Compaction of Fe-Ni-Cu-Mo-C Powders

2010 ◽  
Vol 168-170 ◽  
pp. 1016-1020
Author(s):  
Mei Yuan Ke ◽  
Zhi Yu Xiao
Keyword(s):  
Sintered Density ◽  
Green Density ◽  
Spring Back ◽  
Powder Metallurgy Material ◽  
Warm Compaction ◽  
Dimension Change ◽  
Mixing Method ◽  
Die Wall Lubrication ◽  
Compacting Pressure ◽  
Double Logarithm

The combination of warm compaction and die wall lubrication, called die wall lubricated warm compaction was used to make Fe-Ni-Cu-Mo-C powder metallurgy material. Results showed that the green density could be 7.38 g•cm-3 under the pressure of 700MPa at the temperature of 120°C. The sintered density could be 7.34 g•cm-3 and dimension change was 0.19% when sintered at 1200°C for 50 minutes. Both green density and spring back effect gradually increased as the compacting pressure rose. The relation between compacting pressure and green density could be described by Huang Pei-yun double logarithm equation. Different forming conditions effecting green density in turn from big to small were compacting pressure, lubrication, compacting temperature, mixing method and compacting speed.

Densification Mechanism of Warm Compaction for Iron-Based Powder Materials

2007 ◽  
Vol 534-536 ◽  
pp. 261-264
Author(s):  
Sheng Guan Qu ◽  
Yuan Yuan Li ◽  
Wei Xia ◽  
Wei Ping Chen
Keyword(s):  
Plastic Deformation ◽  
Powder Materials ◽  
Force Component ◽  
Compaction Process ◽  
Densification Mechanism ◽  
Warm Compaction ◽  
Different Temperatures ◽  
Iron Based ◽  
Compaction Processes ◽  
Insight Into

An apparatus measuring changes of various forces directly and continuously was developed by a way of direct touch between powders and transmitting force component, which can be used to study forces state of powders during warm compaction. Using the apparatus, warm compaction processes of iron-based powder materials containing different lubricants at different temperatures were studied. Results show that densification of the powder materials can be divided into four stages, in which powder movement changes from robustness to weakness, while its degree of plastic deformation changes from weakness to robustness. The proposed densification mechanism may provide an insight into understanding of warm compaction process.

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