scholarly journals Mechanical properties and hardness results of the medium frequency induction sintered iron based powder metal bushings

2014 ◽  
Vol 46 (2) ◽  
pp. 195-203 ◽  
Author(s):  
U. Çavdar ◽  
E. Atik ◽  
A. Ataç
Keyword(s):  
Mechanical Properties ◽  
Heating System ◽  
Sintering Process ◽  
Powder Metal ◽  
Medium Frequency ◽  
Sintered Iron ◽  
Conventional Sintering ◽  
Density Values ◽  
Iron Based ◽  
Sintering Method

In this study; iron based powder metal (PM) bushing compacts were sintered via medium frequency induction heating system. Iron based powders were mixed with 2 wt.% copper (Cu), 0.3 wt.% carbon (C) and 1 wt.% zinc stearat (Zn-st) via V-Type mixer. PM compacts were sintered by 2 different sintering processes. One of them was conventional sintering method other was medium frequency induction sintering method. In conventional sintering process, PM bushing compacts were sintered under inert environmental at 1120?C for 30 minutes. In medium frequency induction sintering process, PM bushing compacts were sintered between 30-50 kHz frequency (Medium frequency) at 2 kW, 1120?C for 1 or 3 minutes under atmospheric environmental. Mechanical properties, densities and micro hardness? were investigated for all sintered processes. SEM and micro structural images were taken from polished broken surface of the sintered PM bushing compacts. 3 minutes induction sintered compacts were reached the compressive strength, microhardness and density values of the conventional sintered PM bushing compact.

Effects of β-Si3N4 Seeds Addition on Microstructure and Mechanical Properties of Porous Si3N4 Ceramics

2012 ◽  
Vol 724 ◽  
pp. 201-204 ◽  
Author(s):  
Fang Li Yu ◽  
Yu Bai ◽  
Jun Du ◽  
Ping Ping Yu ◽  
Jian Zhi Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Flexural Strength ◽  
Porous Si ◽  
Three Point Bending ◽  
Average Aspect Ratio ◽  
Conventional Sintering ◽  
Porous Microstructure ◽  
Sintering Method ◽  
Scanning Electron

Porous Si3N4 ceramics were prepared by conventional sintering method with the initial Si3N4 powder added different amounts of β-Si3N4 seeds and 5 wt.% Y2O3. The porosity, density and flexural strength were tested by Archimedes and three-point bending methods, respectively. Microstructure of porous Si3N4 ceramics was studied by scanning electron microscopy. The results showed that the fibrous β-Si3N4 grains developed in the bimodal porous microstructure and the average aspect ratio of 6.42 by adjusting the β-Si3N4 seeds content up to 3 wt.%. Under the porosity of about 42%, the flexural strength of the materials could reached 315.98 MPa.

Preparation of Rare-Earth Permanent Magnetic Strontium Ferrite by Microwave Sintering Process

2010 ◽  
Vol 177 ◽  
pp. 264-268 ◽  
Author(s):  
Han Han Jiang ◽  
Ming Lin Jin ◽  
Zhan Yong Wang ◽  
Qi Zhong Chen ◽  
Hui Chun Qian
Keyword(s):  
Rare Earth ◽  
Microwave Sintering ◽  
Magnetic Domain ◽  
Strontium Ferrite ◽  
Green Body ◽  
Sintering Process ◽  
Wet Milling ◽  
Conventional Sintering ◽  
Degree Of Orientation ◽  
Sintering Method

In this paper, the green body was prepared by pre-roasted material of strontium ferrite, adding 0.2 to 9% the rare earth additive, by wet milling and forming into pellets Φ30×10 mm under magnetic field. Then, the green body was sintered separately by microwave sintering (MS) method and conventional sintering (CS) technique. The results showed that: the strontium ferrite samples with the same magnetic properties Br and (BH) max were 420 ± 10mT and 33.0 ± 2 kJ/m 3) were synthesized by microwave sintering (MS) method against conventional sintering method, the sintering temperature and time were reduced 150~300°C and 5~6h. Therefore, microwave sintering method will significantly decrease energy consumption. Further analysis revealed that the major improvements in microwave sintering were the material microstructure, the grain size was significantly reduced, the magnetic domain short-range order was increased so that the degree of orientation was increased, and although the fusion was existed between grains, the grain boundaries did not disappear.

scholarly journals Effects of TiAl Alloy as a Binder on Cubic Boron Nitride Composites

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6335
Author(s):  
Yuxi Liu ◽  
Wei Zhang ◽  
Yingbo Peng ◽  
Guojiang Fan ◽  
Bin Liu
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Boron Nitride ◽  
Tial Alloy ◽  
Cubic Boron Nitride ◽  
Sintering Process ◽  
Good Oxidation Resistance ◽  
Tial Intermetallics ◽  
High Pressure Sintering ◽  
Sintering Method

Owing to their extreme hardness, cubic boron nitride (cBN) composites are widely used in cutting applications. The performance of cBN composites is closely related to the characteristics of the binder. Therefore, novel binders must be developed to improve the performance of cBN composites. In the present work, TiAl intermetallics were used as binders to fabricate cBN composites by employing a high-temperature and high-pressure sintering method. The phase transformation, sintering reaction mechanism, thermal stability, and mechanical properties of the resultant cBN composites were investigated. It was found that during the sintering process, Ti atoms preferentially reacted with boron nitride particles, whereas Al atoms enriched and transformed into TiAl3 phases and formed cBN/AlN, AlB2/TiN, and TiB2/TiAl3-layered structures eventually. The composites maintained good oxidation resistance at 1200 °C. A decrease in the particle size of the TiAl binder improved the uniformity of particle size distribution and increased the flexural strength of the composites.

Investigation of Conventional- and Induction-Sintered Iron and Iron-Based Powder Metal Compacts

JOM ◽  
2014 ◽  
Vol 66 (6) ◽  
pp. 1027-1034 ◽  
Author(s):  
Uğur Çavdar ◽  
Enver Atik
Keyword(s):  
Powder Metal ◽  
Sintered Iron ◽  
Iron Based

Influence of the Pore Characteristics on Mechanical Properties and Abrasive Wear of Sintered Iron-Based Alloys Subjected to a Thermochemical Treatment

2017 ◽  
Vol 1143 ◽  
pp. 97-102 ◽  
Author(s):  
Mihaela Marin ◽  
Florentina Potecaşu ◽  
Octavian Potecaşu ◽  
Florin Bogdan Marin
Keyword(s):  
Mechanical Properties ◽  
Abrasive Wear ◽  
Fluidized Bed ◽  
Thermochemical Treatment ◽  
Microstructural Characterization ◽  
Zinc Stearate ◽  
Microstructural Characteristics ◽  
Pore Characteristics ◽  
Sintered Iron ◽  
Iron Based

The aim of this paper is to analyse the effect of the pore morphology on microstructural characteristics, mechanical properties and abrasive wear resistance of iron-based alloys subjected to a thermochemical treatment as carburizing in fluidized bed. The starting materials studied in this paper are represented by pre-alloyed iron base powder obtained by powder metallurgy (P/M) route. The powders were produced by water atomization with different particle sizes (< 45, 45-63, 63-100, 100-150, >150 μm). The raw powders have been mixed with 1% zinc stearate as lubricant and uniaxially compacted into cylindrical specimens at room temperature at 600 MPa. The disc dimensions are 8 6 mm. The green compacts were sintered at 1.150 °C for 90 minutes in a laboratory furnnace. After sintering, a thermochemical treatment was applied. The parameters for the carburizinng in fluidized bed are: temperature of 930 °C and time of 45 minutes. The microstructural characterization was carried out using optical microscopy. The porosity of studied samples were analyzed acording to their microstructural characteristics and chemical composition. The mechanical properties and abrasive wear of the sintered and thermochemical treated samples were evaluated. A correlation between porosity, mechanical properties and abrasive wear was established.

Addition of Nano-ZrO2 Effects on Microstructures and Properties of WC-8Co Hard Alloys

2012 ◽  
Vol 496 ◽  
pp. 302-305 ◽  
Author(s):  
Lan Sun
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Fracture Toughness ◽  
Relative Density ◽  
Hard Alloys ◽  
Densification Behavior ◽  
Sintering Process ◽  
Toughening Mechanism ◽  
Hard Metals ◽  
Conventional Sintering

This paper carries out the research on using the toughening mechanism of phase transition of ZrO2 to inhibit the WC grain and improve the toughness of the hard alloys. WC–ZrO2–8wt%Co hard metals was mixed with 0-2 wt% nano-ZrO2 and prepared by conventional sintering (CS) for 2 h at 1440oC to see whether the addition of ZrO2 could improve densification behavior, the microstructure and mechanical properties of the samples. Experimental results showed that the use of ZrO2 nanoparticles could decrease the relative density because of the worse wetting effects; it could also inhibit the growth of the grains of WC-Co hardmetal to enhance the hardness of the alloy. The fracture toughness of sample has an increasing tendency as a whole because of the phase transition during the sintering process.

Preparation and Electrical Properties of Dense Bi4Ti3O12 Ceramics by Spark Plasma Sintering

2007 ◽  
Vol 280-283 ◽  
pp. 141-144
Author(s):  
Jun Jie Hao ◽  
Xiao Hui Wang ◽  
Long Tu Li ◽  
Zhi Lun Gui
Keyword(s):  
Electrical Properties ◽  
Spark Plasma Sintering ◽  
Electronic Materials ◽  
Sintering Temperature ◽  
Sintering Process ◽  
Plasma Sintering ◽  
The Family ◽  
Conventional Sintering ◽  
Spark Plasma ◽  
Sintering Method

The family of bismuth layer-structured ferroelectrics is attractive from the viewpoint of their application as electronic materials such as dielectrics, piezoelectrics and pyroelectrics. However, during conventional sintering method, high sintering temperature and long sintering time were needed and it is difficult to get BIT ceramic with a density more than 95% of its theoretic value. In the present paper, we produce dense BIT pellet using a spark plasma sintering process. The results show that at a sintering temperature as low as 7000C/5min under a pressure of 25MPa, BIT ceramics with a density about 99% of its theoretic can be produced. The densities, grain size and electrical properties of the resulting ceramic were also investigated.

Effect of Process Parameters on the Electrically-Assisted Sintered Iron-Copper Powder Metals

2018 ◽  
Author(s):  
Ihab Ragai ◽  
Matt Schwabenbauer ◽  
Seray Eser ◽  
Michael Müller
Keyword(s):  
Electric Current ◽  
Process Parameters ◽  
Copper Powder ◽  
Cost Effective ◽  
Powder Metal ◽  
Sintered Iron ◽  
Iron Copper ◽  
Conventional Sintering ◽  
Microstructure Examination

Electric-current-assisted sintering (ECAS) is a novel process that can potentially replace the conventional sintering method. It is hypothesized that the process can reduce the sintering time and can be used in situ; thus, can be more cost effective. The purpose of this research is to investigate the effect of direct current on the sintered properties of iron-copper powder metal. Experiments were conducted at various conditions to determine the optimal process parameters for this particular powder metal. The parameters investigated were electric current levels and energizing time. Experiments also included sintering the powder using a conventional furnace. Samples from both types of experiments were compared to determine the metallurgical differences due to the sintering process. Mechanical and microstructure examination were conducted to aid in determining the feasibility of ECAS.

Influence of Sintering Process on the Mechanical Properties of Dental Zirconia Ceramics

2013 ◽  
Vol 738-739 ◽  
pp. 542-545
Author(s):  
W.U. Park ◽  
J.M. Zhao ◽  
Kyu Hong Hwang ◽  
T.S. Kim ◽  
C.H. Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Microwave Sintering ◽  
Electric Heating ◽  
Sintering Process ◽  
Zirconia Ceramics ◽  
Sintering Time ◽  
Dental Zirconia Ceramics ◽  
Sintering Method ◽  
Sintering Condition

Densification and mechanical properties of dental zirconia ceramics were evaluated by different sintering methods. Y-TZP zirconia block was used in this study. Sintering were performed in electric heating furnace and microwave sintering furnace, and then experimented and analyzed on a change in densification according to the sintering time, a change in densification according to thickness, flexural strength and micro-structure of zirconia specimens. Microwave sintering was very effective in considerable mechanical properties such as flexural strength and bulk density was drastically increased than conventional electric heating method. It is also shown that microwave sintering was faster and more economical than common method to be present in qualities which equal or exceed. It will be important to seek the accurate sintering condition of dental zirconia by microwave sintering method and the continuous research is necessary for the study of relationship between sintering methods and mechanical properties.

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