Effect of Aluminum on Mechanical and Frictional Properties of Copper Cladding Iron-Based Braking Material

2014 ◽  
Vol 904 ◽  
pp. 103-106
Author(s):  
Ping Yang ◽  
Chuan Qi Fu ◽  
Zhou Wang
Keyword(s):  
Aluminum Content ◽  
Chromium Content ◽  
Wear Test ◽  
Excellent Performance ◽  
Iron Matrix ◽  
Frictional Properties ◽  
Power Content ◽  
Iron Based ◽  
Sintering Method ◽  
Carbide Content

Fe-20wt%Cu-Al braking materials were prepared by induction heating sintering method combined with the Copper cladding iron matrix with various aluminum elements. Effects of Aluminum on surface morphology, Mechanical and frictional properties of Cu-Fe-based Braking Material were analyzed by Scanning Electron Microscope (SEM), machine test and friction-wear test. Lastly suitable parameters of the process are decided. Meanwhile, wear mechanisms were discussed. The results showed that the prepared shaking materials with aluminum content of 3wt%, silicon carbide content of 5wt%, manganese and chromium content of 5wt% and copper cladding iron power content of 87wt% had excellent performance.

scholarly journals Sintering and Mechanical Properties of (SiC + TiCx)p/Fe Composites Synthesized from Ti3AlC2, SiC, and Fe Powders

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2453
Author(s):  
Mingtao Wang ◽  
Zecheng Wang ◽  
Zhiyue Yang ◽  
Jianfeng Jin ◽  
Guoping Ling ◽  
...  
Keyword(s):  
Ceramic Particle ◽  
Matrix Composites ◽  
Plastic Response ◽  
Excellent Performance ◽  
Iron Matrix ◽  
Particle Content ◽  
Reinforcing Effect ◽  
In Situ Formation ◽  
Hybrid Reinforcement

Ceramic-particle-reinforced iron matrix composites (CPR-IMCs) have been used in many fields due to their excellent performance. In this study, using the fast resistance-sintering technology developed by our team, iron matrix composites (IMCs) reinforced by both SiC and TiCx particles were fabricated via the addition of SiC and Ti3AlC2 particles, and the resulting relative densities of the sintering products were up to 98%. The XRD and EDS analyses confirmed the in situ formation of the TiCx from the decomposition of Ti3AlC2 during sintering. A significant hybrid reinforcing effect was discovered in the (SiC + TiCx)p/Fe composites, where the experimental strength and hardness of the (SiC + TiCx)p/Fe composites were higher than the composites of monolithic SiCp/Fe and (TiCx)p/Fe. While, under the condition of constant particle content, the elongation of the samples reinforced using TiCx was the best, those reinforced by SiC was the lowest, and those reinforced by (SiC + TiCx) fell in between, which means the plastic response of (SiC + TiCx)p/Fe composites obeyed the rule of mixture. The successful preparation of IMCs based on the hybrid reinforcement mechanism provides an idea for the optimization of IMCs.

scholarly journals Effect of In-Situ Synthesized Boride Phases on the Impact Behavior of Iron-Based Composites Reinforced by B4C Particles

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 554
Author(s):  
Fehmi Nair ◽  
Mustafa Hamamcı
Keyword(s):  
Contact Forces ◽  
Impact Behavior ◽  
Iron Matrix ◽  
Impact Tests ◽  
B4c Particles ◽  
Iron Based ◽  
In Situ Reactions ◽  
Boride Phases ◽  
The Impact

The objective of this study is to investigate the impact behavior of iron-based composites reinforced with boron carbide (B4C) particles and in-situ synthesized iron borides (Fe2B/FeB). The composite specimens (Fe/B4C) were fabricated by hot-pressing under a pressure of 250 MPa at 500 °C, and sintered at a temperature of 1000 °C. The effects of the reinforcement ratio on the formation of in-situ borides and impact behavior were investigated by means of different volume fractions of B4C inside the iron matrix: 0% (un-reinforced), 5%, 10%, 20%, and 30%. Drop-weight impact tests were performed by an instrumented Charpy impactor on reinforced and un-reinforced test specimens. The results of the impact tests were supported with microstructural and fractographical analysis. As a result of in-situ reactions between the Fe matrix and B4C particles, Fe2B phases were formed in the iron matrix. The iron borides, formed in the iron matrix during sintering, heavily affected the hardness and the morphology of the fractured surface. Due to the high amount of B4C (over 10%), porosity played a major role in decreasing the contact forces and fracture energy. The results showed that the in-situ synthesized iron boride phases affect the impact properties of the Fe/B4C composites.

The Effect of Boron on the Sliding Wear Behavior of Iron-Based Hardfacing Alloys for Nuclear Power Plants Valves

2006 ◽  
Vol 510-511 ◽  
pp. 562-565
Author(s):  
Jeng Wan Yoo ◽  
Kwon Yeong Lee ◽  
Ji Hui Kim ◽  
Ki Soo Kim ◽  
Seon Jin Kim
Keyword(s):  
Wear Resistance ◽  
Martensitic Transformation ◽  
Nuclear Power ◽  
Sliding Wear ◽  
Power Plants ◽  
Wear Behavior ◽  
Wear Test ◽  
Wear Loss ◽  
The Matrix ◽  
Iron Based

A new iron-based wear resistance alloy was developed to replace the Co-containing Stellite 6 alloys in nuclear power industry. The effect of B addition on the wear resistance was investigated. Sliding wear tests of Fe-Cr-C-Si-xB (x = 0.0, 0.3, 0.6, 1.0 and 2.0 wt%) alloys were performed in air at the room temperature under a contact stress of 103 MPa. Low-boron alloys containing less than 0.6 wt% boron showed an excellent wear resistance than any other tested alloys. The improvement was associated with the matrix hardening by promotion of the γ→α′straininduced martensitic transformation occurring during the wear test. However, the alloys containing more than 1.0 wt% boron showed slightly increased wear loss compared to the low-boron alloys because of the absence of the strain-induced martensitic transformation and the presence of the brittle FeB particles, aiding crack initiation.

Optimization of Structure of Hardmetal Reinforced Iron-Based PM Hardfacings for Abrasive Wear Conditions

2016 ◽  
Vol 721 ◽  
pp. 351-355 ◽  
Author(s):  
Taavi Simson ◽  
Priit Kulu ◽  
Andrei Surženkov ◽  
Dmitri Goljandin ◽  
Riho Tarbe ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Wear Test ◽  
Abrasive Wear Resistance ◽  
Volumetric Wear ◽  
Optimal Composition ◽  
Wheel Wear ◽  
Iron Based ◽  
Scanning Electron ◽  
Shape And Size

This paper focuses on the influence of hardmetal reinforcement amount, shape and size on the abrasive wear resistance of composite iron self-fluxing alloy (FeCrSiB) based hardfacings produced by the powder metallurgy (PM) technology. First, the size of the reinforcement (1 – 2.5 mm) was fixed, but its shape (angular or spherical) and amount (0 – 50 vol%) were varied. Then the reinforcement shape (angular) and amount (50 vol%) were kept constant, while its size (0.16 – 0.315 mm fine reinforcement and 1 – 2.5 mm coarse reinforcement) and proportion of fine and coarse reinforcement (all fine, all coarse, half fine-half coarse) were varied. ASTM G65 abrasive rubber wheel wear test was applied to find out the wear resistance of the hardfacings; an unreinforced self-luxing alloy (FeCrSiB) hardfacing was the reference material. Volumetric wear rate was calculated according to the weight loss. Worn surfaces were studied under scanning electron microscope. As a result, an optimal composition of the hardmetal containing Fe-based hardfacings based on the reinforcement amount (vol%), shape (irregular or spherical) and size (fine or coarse) is given.

scholarly journals The Effect of Copper Content on the Mechanical and Tribological Properties of Hypo-, Hyper- and Eutectoid Ti-Cu Alloys

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3411
Author(s):  
Yiku Xu ◽  
Jianli Jiang ◽  
Zehui Yang ◽  
Qinyang Zhao ◽  
Yongnan Chen ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloys ◽  
Friction And Wear ◽  
Intermediate Phase ◽  
Wear Test ◽  
Scanning Calorimetry ◽  
Cu Content ◽  
Frictional Properties ◽  
Β Phase ◽  
Cu Alloys

Titanium alloys are widely used in aerospace, chemical, biomedical and other important fields due to outstanding properties. The mechanical behavior of Ti alloys depends on microstructural characteristics and type of alloying elements. The purpose of this study was to investigate the effects of different Cu contents (2.5 wt.%, 7 wt.% and 14 wt.%) on mechanical and frictional properties of titanium alloys. The properties of titanium alloy were characterized by tensile test, electron microscope, X-ray diffraction, differential scanning calorimetry, reciprocating friction and wear test. The results show that the intermediate phase that forms the eutectoid structure with α-Ti was identified as FCC Ti2Cu, and no primary β phase was formed. With the increase of Cu content, the Ti2Cu phase precipitation in the alloy increases. Ti2Cu particles with needle structure increase the dislocation pinning effect on grain boundary and improve the strength and hardness of titanium alloy. Thus, Ti-14Cu shows the lowest elongation, the best friction and wear resistance, which is caused by the existence of Ti2Cu phases. It has been proved that the mechanical and frictional properties of Ti-Cu alloys can be adjusted by changing the Cu content, so as to better meet its application in the medical field.

Microstructural Valuation of Iron-Based Composite Materials as an Ecomaterial

1996 ◽  
Vol 457 ◽  
Author(s):  
Norihiro Itsubo ◽  
Koumei Halada ◽  
Kazumi Minagawa ◽  
Ryoichi Yamamoto
Keyword(s):  
Low Temperature ◽  
Fine Particles ◽  
Point Of View ◽  
Iron Matrix ◽  
Important Method ◽  
Pull Out ◽  
The Matrix ◽  
Iron Based ◽  
Ultra Fine Particles ◽  
Nano Size

ABSTRACTOne of an important method to realize is said that we should take recycle processes into consideration and select the material without the mixture of particular elements that make it difficult to recycle. Therefore, it is useful to control of microstructure for improvement.From this point of view, we paid attention to “SCIFER (that is made from Kobe Steel Ltd.)” that has a recyclable formation (Fe-C-Si-Mn) and superior characteristic (tensile strength is 5000MPa). The grain size of this fiber is nano-size. In this study, we used this material and compounded it together with iron-matrix to make an iron-based composite for recycle and investigated the possibilities of realization. The difficulty of this study is to make this composite without injuring the fiber's microstructure. Therefore, we have adopted powder metallurgy which could fabricate composite at low temperature comparatively. Especially, Ultra Fine Particles (UFP) that would sinter at low temperature to bond the interface between fiber and matrix with keeping fiber's capacity. This method is useful to ascend the density of the matrix. Results are as follows. (1) Utilization of UFP slurry made it possible to adhere UFP to the surface of fiber and seed powder. Still more, this procedure enabled it to make a thin film uniformly by selecting the condition of slurry density and procedure of dryness. (2) Applying UFP to the surface of fiber and seed powder make it possible to get the bond between fiber and matrix. By the bond of interface, both fracture strength and energies have ascended remarkably due to pull out of fiber.

A Modified Micro-Scale Abrasion for Large Hard Phase Cermet

2013 ◽  
Vol 393 ◽  
pp. 888-892 ◽  
Author(s):  
Zakiah Kamdi ◽  
P.H. Shipway ◽  
K.T. Voisey
Keyword(s):  
Standard Deviation ◽  
Thermal Spraying ◽  
Wear Test ◽  
Wear Behaviour ◽  
Hard Phase ◽  
Abrasive Particles ◽  
Cermet Coatings ◽  
Wear Rates ◽  
Micro Scale ◽  
Carbide Content

Various research programmes have been conducted examining cermet coatings in relation to wear, corrosion and the combination of both (erosion-corrosion and abrasion-corrosion). Several methods have been employed to deposit cermet coatings, the most common being thermal spraying or hard facing (weld overlaying).The cermet coatings are carbide-sized ranging from 50 150 μm which is larger than abrasive particles which range between 2 to 10 μm. This allows the abrasive particles to interact with the carbide and matrix separately. Understanding the mechanism of this situation is necessary as abrasion maybe caused by a small abrasive. However, carbide sinking caused by this large carbide leads to diverse local carbide distributions and wear rates with a larger standard deviation. Modified micro-scale abrasion tests were performed with a silica abrasive of 2-10 μm particle size distribution and suspended in water. Due to the sinking of carbide particles during the coating process, the ground samples with more carbide on the surface displayed better wear resistance than those with a lower local carbide content. By using a modified micro-scale abrasion wear test, the correlation between local carbide content and wear rate may be determined with a smaller standard deviation. Rolling wear mode was observed due to the lower degree of hardness of the abrasive compared to the hard phase. The wear behaviour is related to the microstructure.

Study on Preparing Aero-Concrete Using Leaching Residual Slag of Lepidolite Ore

2011 ◽  
Vol 99-100 ◽  
pp. 375-378
Author(s):  
Shao Wen Huang ◽  
Chuan Lin Zeng ◽  
Yu Hua Xu ◽  
Qi Luo
Keyword(s):  
Fly Ash ◽  
Aluminum Content ◽  
Volume Density ◽  
National Standards ◽  
Excellent Performance ◽  
Preparation Technology ◽  
Major Increase ◽  
Activating Agent ◽  
Lithium Slag

Preparation technology and the performance of aero-concrete using leaching residual slag come from extracting lithium from lepidolite were discussed in this paper. Results show the strength of aero concrete can be slightly improved by using lithium slag instead of fly ash, but the volume density has a major increase, and the gas-forming speed doesn't match the thickening speed. By means of increase in aluminum content and the ratio of water to materials, adding the activating agent, excellent performance products that meet the national standards were synthesized.

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