Carpenter launches first high-strength, low-oxygen titanium powder

2017 ◽  
Vol 72 (5) ◽  
pp. 374
Keyword(s):  
Titanium Powder ◽  
High Strength ◽  
Low Oxygen

Properties of titanium coating deposited using spheroidal powders by cold spraying

2017 ◽  
Vol 1 (82) ◽  
pp. 12-17
Author(s):  
W. Żórawski ◽  
J. Mądry ◽  
J. Sienicki ◽  
M. Makrenek ◽  
A. Góral ◽  
...  
Keyword(s):  
Titanium Powder ◽  
Thermal Spraying ◽  
Weight Ratio ◽  
High Strength ◽  
Cold Spraying ◽  
Phase Changes ◽  
Titanium Coating ◽  
Deformation Degree ◽  
Spray Process ◽  
Process Gas

Purpose: TThe purpose of this study was to investigate the microstructure and the properties of the Ti coatings cold sprayed using spheroidal powder on the Al 7075 alloy. Design/methodology/approach: The Ni powder with irregular shape of grains was applied in the cold spraying process. The coatings were sprayed by means of a Impact Innovations 5/8 system with of nitrogen as process gas. Findings: The high kinetic energy of titanium particles causes their significant deformation and splats strongly adhere to the substrate and to each other. Cold sprayed titanium coatings exhibit negligible porosity and different mechanical properties caused by varying deformation degree of titanium powder. There were no phase changes in titanium powder during the spray process, and the coating consist of crystalline titanium. Practical implications: Titanium and its alloys have unique properties such as a high strength to weight ratio, excellent corrosion resistance and bio-compatibility. These features make it a material that is ideally suited for use in the aerospace, medical, and corrosive industries. Originality/value: The main advantage of cold spraying is elimination of influence of temperature on the particles of the coating material and the substrate that occurs in conventional thermal spraying methods. Therefore, the properties of such formed coatings are not available in other technologies.

Reaction Sintering of Tial Intermetallic Compound

2021 ◽  
Vol 1016 ◽  
pp. 744-748
Author(s):  
Yoshihiro Kohama ◽  
Masahiro Kimura ◽  
Toru Shimizu ◽  
Hisaki Watari
Keyword(s):  
Fuel Efficiency ◽  
Carbon Dioxide Emission ◽  
High Strength ◽  
High Porosity ◽  
Reaction Sintering ◽  
Low Oxygen ◽  
Mixed Powder ◽  
Rapid Temperature ◽  
Ti Powder ◽  
Low Oxygen Concentration

Improvement of fuel efficiency and reduction of carbon dioxide emission are important issues in the automotive and aviation industries. To achieve these issues, materials that are lightweight and have excellent heat resistance are required. For this reason, various alloys have been proposed. Among them, TiAl intermetallic compounds have excellent low specific gravity and high strength at high temperature. However, TiAl is difficult for machining and easily oxidized, so casting is difficult. For this reason, a method using reaction sintering has been studied, though it is difficult to obtain low oxygen concentration TiAl alloy powder. Therefore, the process to produce TiAl parts from Ti powder and Al powder is studied. However, in this method, when a mixed powder of Ti and Al is sintered, a phenomenon called ignition with a rapid temperature increasing may occurs, and ignited parts are swelling and becomes high porosity.

scholarly journals THE EFFECT OF DIFFERENT FORMS OF OXYGEN ON PROPERTIES OF BETA TITANIUM ALLOYS

2018 ◽  
Vol 58 (3) ◽  
pp. 179 ◽  
Author(s):  
Jaroslav Málek ◽  
František Hnilica ◽  
Sonia Bartáková ◽  
Patrik Míka ◽  
Jaroslav Veselý
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Titanium Alloys ◽  
Titanium Powder ◽  
Aerospace Industry ◽  
Weight Ratio ◽  
High Strength ◽  
Beta Titanium ◽  
Oxide Particles ◽  
Beta Titanium Alloys

The beta-titanium alloys are widely used in many applications (medicine, aerospace industry etc.) due to their superior properties, such as corrosion resistance, biocompatibility and high strength to weight ratio. One of the ways how to increase the strength of those alloys is the addition of oxygen. The oxygen can be present in various forms in the alloy – in a solid solution or in the form of oxides. In this work, the effect of two forms of oxygen (i.e., solid solution and dispersion particles) was studied. Two alloys, one arc melted with different oxygen additions and one prepared via powder metallurgy where the titanium powder was oxidized, were prepared. The microstructure and mechanical properties were studied. A significant increase in strength with increasing the oxygen content in the solid solution has been observed. However, the powder oxidation has almost no effect on a tensile strength probably due to quite large interparticle distances between titanium oxide particles.

Aiming at low-oxygen titanium powder: A review

2021 ◽  
Author(s):  
Kumar Debajyoti Jena ◽  
Sherry Xu ◽  
Muhammad D. Hayat ◽  
Wen Zhang ◽  
Peng Cao
Keyword(s):  
Titanium Powder ◽  
Low Oxygen

Full-scale experience with the deammonification process to treat high strength sludge water – a case study

2012 ◽  
Vol 65 (3) ◽  
pp. 447-455 ◽  
Author(s):  
N. Jardin ◽  
J. Hennerkes
Keyword(s):  
Wastewater Treatment Plants ◽  
High Strength ◽  
Full Scale ◽  
Lag Phase ◽  
Stable Operation ◽  
Low Oxygen ◽  
Recent Developments ◽  
Treatment Train ◽  
Volumetric Loading ◽  
Nitrogen Elimination

More stringent effluent criteria with regard to nitrogen calls for improved nutrient removal techniques in wastewater treatment plants (WWTPs). Besides optimisation of the liquid treatment train of the plants, attention has increasingly centred on the problem of return flows from sludge treatment. One of the most recent developments aimed at the reduction of this nitrogen load is deammonification which has been used at one of Ruhrverband's plants since 2002 by applying a moving bed system. To gain additional experience in operating this process, another full scale plant was modified in 2007 by integration of deammonification, using a SBR system with suspended biomass based on the DEMON® control scheme. By using seeding sludge from Strass WWTP in Austria, start-up has been achieved within only 1 day. After stable operation for several months, increasing nitrate concentrations were observed in the effluent of the system indicating growing activity of nitrite oxidising bacteria (NOB). Following severe process deterioration, it was decided to re-start the system again but the same behaviour, i.e. increasing levels of nitrate, was observed once again. Several approaches were used to suppress NOB organisms in full-scale without success, e.g. low oxygen levels and high free ammonia concentrations. Finally, the reduction of the aerobic cycle length during intermittent aeration down to 8 min, followed by an anoxic mixing period of only 18 min was successful in inhibiting the activity of NOB organisms, most probably due to their elevated lag-phase compared with ammonium oxidising bacteria. Today, nitrogen elimination that has been stabilised at more than 80% at a daily volumetric loading rate of 0.5 kg N/(m3 d). The total costs amount to €2.3/kg Neli.

Preparation of Ti-5553 Alloy by Different Extrusion Processes from Elemental Powder Mixtures

2018 ◽  
Vol 770 ◽  
pp. 31-38 ◽  
Author(s):  
Fei Yang ◽  
Brian Gabbitas ◽  
Stiliana Raynova ◽  
Ajit Pal Singh ◽  
Leandro Bolzoni
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Titanium Alloy ◽  
Master Alloy ◽  
Powder Compact ◽  
Titanium Powder ◽  
Mechanical Test ◽  
High Strength ◽  
Powder Mixtures ◽  
Good Ductility

Ti-5553 (Ti-5Al-5V-5Mo-3Cr, wt. %) alloy is a recently developed near β titanium alloy and it has a very good hardenability, good ductility and high strength. In this study, we discussed the feasibility of preparing Ti-5553 alloy by different processes from powder mixtures of hydride-dehydride titanium powder, elemental powders and master alloy powders, including (1) direct extrusion of powder compact in argon, (2) extrusion of the vacuum-sintered billet in air and (3) extrusion of the hot-pressed billet in air. XRD, OM and SEM were used to determine the phase constitutions and microstructures of the prepared Ti-5553 alloys, and mechanical test was performed to examine their mechanical properties. The results showed the microstructures and phase constitutions of Ti-5553 alloys were significantly affected by different processes, which resulted in the relevant mechanical properties. The effect of the selected heat treatment on the microstructures and properties of Ti-5553 alloy were investigated as well.

scholarly journals Die Compaction of Low Oxygen Titanium Powder Produced by Gas Atomization.

1993 ◽  
Vol 40 (4) ◽  
pp. 405-409
Author(s):  
Masatomo Kamada ◽  
Setsuo Takaki ◽  
Youichi Tokunaga ◽  
Yasuyuki Ikeda ◽  
Hiroaki Shiraishi
Keyword(s):  
Titanium Powder ◽  
Gas Atomization ◽  
Low Oxygen ◽  
Die Compaction

scholarly journals Effective Method for Preparing Low-Oxygen Titanium Ingot by Combined Powder Deoxidation and Vacuum Arc Melting Processes

2021 ◽  
Vol 59 (3) ◽  
pp. 149-154
Author(s):  
Jung-Min Oh ◽  
Jaeyeol Yang ◽  
Jaesik Yoon ◽  
Jae-Won Lim
Keyword(s):  
Oxygen Concentration ◽  
Titanium Powder ◽  
Semiconductor Industry ◽  
High Vacuum ◽  
Vacuum Arc ◽  
Low Oxygen ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Low Concentrations ◽  
Calcium Vapor

In this study, an effective method is demonstrated for fabricating titanium sputtering targets, which are used to fabricate thin films in the semiconductor industry. The method is an alternative to the existing electron beam melting (EBM) process under high vacuum. Titanium sputtering targets used in the production of semiconductors must have very low concentrations of gaseous impurities, especially oxygen, as well as metal impurities. Currently, the oxygen concentration in titanium sputtering targets used for industrial purposes is less than 400 ppm. To develop an effective alternative method, powder metallurgy and melting processes were performed to prepare a low-oxygen titanium ingot with less than 400 ppm oxygen. First, titanium powder was deoxidized using calcium vapor, and then the powder was subjected to vacuum arc melting (VAM). The oxygen in the titanium powder was reduced with calcium vapor from an initial concentration of 2200 ppm to 800 ppm, and the resulting powder was melted using VAM, resulting in titanium ingots with low oxygen content, 400 ppm or less. It was also confirmed that all lattice constants, i.e., <i>d, a, c,</i> and <i>c/a</i>, decreased as oxygen concentration decreased in both the titanium powder and the ingots.

Powder Consolidation of Titanium and Titanium Alloys by a Powder Compact Forging Process

2016 ◽  
Vol 704 ◽  
pp. 68-74 ◽  
Author(s):  
Ming Tu Jia ◽  
Brian Gabbitas
Keyword(s):  
Mechanical Properties ◽  
Powder Compact ◽  
Titanium Powder ◽  
Full Density ◽  
Low Oxygen ◽  
Powder Consolidation ◽  
Forging Process ◽  
Cp Ti ◽  
Field Assisted Sintering ◽  
Powder Compacts

Powder compact forging in combination with induction sintering, a field assisted sintering technique (FAST), was used to produce commercially pure (CP) Ti and Ti-13V-11Cr-3Al parts. Green powder compacts with high relative density were manufactured by cold compaction and warm compaction, respectively. During the powder compact forging process, CP titanium powder was consolidated completely to produce a near net shaped top cover for a diving helmet with full density and good mechanical properties. Also, a Ti-13V-11Cr-3Al alloy was fully consolidated into a cylinder using blended elemental powders. As a comparison, raw titanium powder with different oxygen contents was used to make a Ti-13V-11Cr-3Al powder compact forging. Using a starting powder with low oxygen content, a forged cylinder with good mechanical properties was produced.

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