scholarly journals Characterization of mechanical properties of composite materials with filler coconut shell powder and sawdust with coconut fiber reinforcement as an alternative to low loaded brake friction materials

2021 ◽  
Vol 9 (2) ◽  
pp. 017-023
Author(s):  
Anak Agung Alit Triadi ◽  
Sujita Darmo
Keyword(s):  
Wear Test ◽  
Hardness Test ◽  
Friction Material ◽  
Test Results ◽  
Sintering Process ◽  
Wear Rates ◽  
Safety Standards ◽  
Composition Variation ◽  
Brake Lining

The purpose of the study is to determine the best composition variation of the fifth variation of the composition of the composite material against the wear test, hardness test, tensile test comparing values ​​ with the safety standards of the brake lining composite SAEJ 661. Making the specimens was performed by mixing the ingredients with a mixer for 15 minutes and then do the process of compaction, with a load of 4 tons and detained achieve holding time is desired, then dies (mould) are placed in the oven and do the sintering process at a temperature of 1500 C for 180 minutes and specimens removed from the mould, the process of finishing and testing. These test results show that the composition of the material that is on variation V best price obtained 96.575 HBN hardness, wear rates of 1,29x10-6 gr / (mm2.detik), and a tensile strength of 0.842 MPa, but the brake friction material not meet safety standards SAEJ brake 661.

scholarly journals Fabrication and Mechanical Characterization of Stir Cast AA6063-Borosilicate-Fly Ash Hybrid Metal Matrix Composites

2018 ◽  
Vol 7 (3.6) ◽  
pp. 101 ◽  
Author(s):  
G Jims John Wessley ◽  
A Gaith Franklin ◽  
S J. Vijay
Keyword(s):  
Wear Resistance ◽  
Fly Ash ◽  
Aluminium Alloy ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Wear Test ◽  
Hardness Test ◽  
Structural Applications

This paper presents the development and characterization of aluminium alloy 6063 based metal matrix composite with varying combinations of fly ash and Borosilicate reinforcements.  In the present work, the aluminium alloy 6063 (AA) is taken at a constant 84 vol% while the reinforcements Fly Ash (FA) and Borosilicate (B) are varied in the proportions of 2%, 4% 8%, 125 and 14%. Six samples were fabricated by stir casting and the mechanical properties were analyzed using tensile test, hardness test and wear test while the microstructure is analyzed by obtaining SEM and EDX images of the specimen. It is seen that both the reinforcements used in this study, increased the tensile and wear resistance of the alloy. The desirable mechanical and micro structural properties were found to be in the specimen with 84% AA, 14% FA and 2% B. The tensile strength of the aluminum alloy at this desirable combination is found to increase by 11.97%, ductility by 36.75% and the wear resistance by 62%.  This metal matrix composite of AA6063 with fly ash and Borosilicate reinforcements can be used in automobile, aerospace and structural applications where wear resistance and tensile properties are mainly required.

scholarly journals Effect of In-situ Tribo-oxide-layer on the Non-lubricated Tribological Behaviors of LM27/ SiCp Composites

2021 ◽  
Author(s):  
Pardeep Kumar Nagpal ◽  
Suresh Kumar ◽  
Ranvir Singh Panwar ◽  
J. D. Sharma ◽  
Neeru Singla ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Contact Region ◽  
Wear Test ◽  
Stir Casting ◽  
Friction Material ◽  
Wear Performance ◽  
Pin On Disc ◽  
Fine Size ◽  
Brake Lining

In this study, an investigation on the influence of In-situ tribo-oxide-layer on non-lubricated tribological behaviours of LM27/SiCp composites was carried out at different applied loads. The variations in wear performance and microstructure of brake lining friction material (LM27) with the addition of different amounts and sizes of SiCp are explored. For this purpose, LM27/SiCp composite materials were manufactured by stir casting route varying the amount of particle reinforced from 3wt.% to 12wt.% with a different size range (fine: 1-20µm and coarse: 106-125µm). Non-lubricated dry wear tests of LM27/SiCp composites samples were trialled at different loads from 9.8N to 49N by using a pin-on-disc machine system. At a contact pressure of 0.2-1 MPa, LM27/SiCp composites with 12wt.% reinforcement showed a lower coefficient of friction than other composites. In-situ formation of oxide layers on the contact region of the specimen supports the self-lubrication during the wear test, which is responsible for better wear performance of LM27/SiCp composites. However, these study portraits that composite with 12wt. % fine size SiCp exhibits better wear performance in comparison to the other developed composites.

Impact of brass contents on thermal, friction and wear properties of brake linings composites

2018 ◽  
Vol 19 (1) ◽  
pp. 105
Author(s):  
Amira Sellami ◽  
Mohamed Kchaou ◽  
Reçai Kus ◽  
Jamal Fajoui ◽  
Riadh Elleuch ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Copper Alloy ◽  
Friction And Wear ◽  
Wear Test ◽  
Friction Material ◽  
Wear Properties ◽  
Braking Performance ◽  
Complex Formulation ◽  
Alloy Particles ◽  
Brake Lining

Automotive brake lining materials are composite materials of very complex formulation, highly heterogeneous. They help to carry out the desired combination of braking performance properties. Obviously, it requires that the friction material exhibits good complementarities and adequate combination of physico-chemical, thermal properties that act synergistically to provide the braking performance which should be adjusted by the addition of metallic fillers. The aim of this work is to study the role of one of the copper alloy particles, namely brass, on friction and wear. For this purpose, the experimental approach is based on the development of a simplified formulation. Three derived composites were developed in the laboratory by the addition 1.5 wt.%, 3 wt.% and 4.5 wt.% of brass. It is shown that addition of copper alloy particles increased thermal properties. Wear test results show that brass contributes to friction and wear mechanisms from a quantity introduced in the formulation equal to 4.5 wt.%. In fact, given its large size, it acts as primary plates serving as supports for the formation and expansion of plates necessary to enhance the stability of friction coefficient. Conversely, when adding an amount less than 4.5%, brass particles are generally all removed from the matrix implying a higher source flow of third-body wear.

FRICTION STIR PROCESSING OF SKD61 TOOL STEEL

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1116-1121 ◽  
Author(s):  
YINGCHUN CHEN ◽  
KAZUHIRO NAKATA
Keyword(s):  
Mechanical Property ◽  
Tool Steel ◽  
Cubic Boron Nitride ◽  
Base Material ◽  
Wear Test ◽  
Hardness Test ◽  
Test Results ◽  
Friction Stir ◽  
Polycrystalline Cubic Boron Nitride ◽  
Observation Results

In this study, SKD61 tool steel was friction stir processed (FSP) using a polycrystalline cubic boron nitride (PCBN) tool. Microstructure evolution and mechanical property in FSP zone were investigated. Microstructural observation results showed that the microstructures in FSP zone surface were fine grains in the range of 1 - 4 μm due to large plastic deformation during FSP. Micro-hardness test results showed that the average hardness value in FSP zone was 773 HV, 3.7 times the hardness in base metal (210 HV). The wear test results showed that FSP surface showed a significantly lower wear rate than that of the base material at all loads. The relation between microstructural evolution and mechanical property in FSP zone was discussed.

Preparation and Characterization of Natural Hydroxyapatite: A Comparative Study of Bovine Bone Hydroxyapatite and Hydroxyapatite from Calcite

2007 ◽  
Vol 561-565 ◽  
pp. 1441-1444 ◽  
Author(s):  
M.K. Herliansyah ◽  
D.A. Nasution ◽  
Mohd Hamdi Bin Abdul Shukor ◽  
A. Ide-Ektessabi ◽  
Muhammad Waziz Wildan ◽  
...  
Keyword(s):  
Comparative Study ◽  
Hydrothermal Method ◽  
Hardness Test ◽  
Bovine Bone ◽  
Test Results ◽  
Natural Sources ◽  
Bovine Hydroxyapatite ◽  
Natural Hydroxyapatite

The production of natural hydroxyapatite (HAp) specifically from cortical bovine bones and natural calcite was studied in this paper. Bovine hydroxyapatite (BHA) was produced from bovine bone in bulk form by de-fatting continued with calcination at 900°C. Natural calcite hydroxyapatite (CHA) was produced by hydrothermal method. It was confirmed from XRD, FTIR, and SEM results that HA have been successfully produced from natural sources like bulk bovine bone and natural calcite. The results also show that the crystallinity of BHA is higher than CHA, matching with the hardness test results of sintered BHA and CHA.

Synthesis and Characterization of Aluminiun 2219 Reinforced with Boron Carbide and Molybdenum Disulfide Metal Matrix Hybrid Composites

2015 ◽  
Vol 1101 ◽  
pp. 28-31 ◽  
Author(s):  
G.S. Shiva Shankar ◽  
S. Basavarajappa
Keyword(s):  
Boron Carbide ◽  
Molybdenum Disulfide ◽  
Hybrid Composites ◽  
Hardness Test ◽  
Xrd Analysis ◽  
Stir Casting ◽  
Test Results ◽  
Physical Content ◽  
Casting Technique

An attempt has been made to develop and characterize the Al2219 reinforced with Boron carbide (B4C) and Molybdenum disulfide (MoS2) hybridcomposites. The hybrid composites were prepared by using stir casting technique. Theexperimentalresult evaluates the density,micro hardness test & tensiletest.Themicrostructure shows existence of randomly dispersed reinforcement particles andfine reinforcement particles in prepared hybrid composites.X-Ray powder diffraction (XRD) analysis were conducted this confirms the physical content of constituents present in prepared composites. SEM is used to examine fracture surface of tensile specimens for hybrid composites & this consists of ductile& brittle fracture of mixed mode.The test results revels that, themicro hardness and density is minimum for Al2219 and maximum for Al+3%B4C+5%MoS2. The tensile properties of the material vary according to the percentage of reinforcing material added.

scholarly journals An Investigation of Wear Behaviors of AA7075 Al Hybrid Composites

2018 ◽  
Vol 37 (7) ◽  
pp. 619-624 ◽  
Author(s):  
Musa Yıldırım ◽  
Dursun Özyürek
Keyword(s):  
Hybrid Composites ◽  
Wear Behavior ◽  
Wear Test ◽  
Ex Situ ◽  
Powder Metallurgy Method ◽  
Test Results ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Weight Losses

AbstractThis study investigates the wear behavior of Al hybrid composites produced by adding 4 % Ti and different amounts of B4C (ex situ) to the AA7075 alloy produced by powder metallurgy method in order to obtain TiAl3 (in situ) reinforcement phase. Different amounts of B4C (3 %, 6 % and 9 %) were added to the 4 % Ti added AA7075 alloy. Preformed parts were sintered in controlled atmosphere (argon) heat treatment furnace at 580 °C for 4 hours and then cooled. After the sintering process, the samples were characterized with scanning electron microscopy, X-ray diffraction and density and hardness measurements. Wear tests of the samples were conducted at 1ms-1 sliding speed, under 30N load for 6 different sliding distances (500–3000 m). As a result of the study, the density of the AA7075 alloys, added 4 % Ti and different amounts of B4C, was observed to decrease by the increasing amount of reinforcement elements. Also, the highest hardness value was measured for the 9 % B4C added AA7075 alloy. Wear test results showed that the weight loss of the aluminum hybrid composites increased with the increasing sliding distance. On the other hand, it was observed that weight losses of composites decreased with increasing amount of B4C.

KARAKTERISASI KEAUSAN KOMPOSIT CANGKANG KEMIRI DAN TEMPURUNG KELAPA SEBAGAI BAHAN PEMBUATAN KAMPAS REM (BRAKE PAD)

2019 ◽  
Vol 3 (2) ◽  
Author(s):  
Juan Randy Simamora ◽  
Chandra Kurniawan
Keyword(s):  
Data Analysis ◽  
Wear Test ◽  
Friction Material ◽  
Test Results ◽  
Brake Pad ◽  
Friction Materials ◽  
Brake Pads ◽  
Reinforcing Fibers ◽  
Coconut Shells ◽  
Shell Powder

The research has been conducted on the use of candlenut shells and coconut shells as composite materials in the manufacture of brake pads. The design of friction composite formulations is carried out based on four classes of friction material namely fillers, binders, reinforcing fibers and property modifiers with a fixed percentage based on weight. Comparison of the composition of Candlenut shell powder and coconut shell for each sample S-01 (35: 25) wt .-%, S-02 (30: 20) wt .-%, and S-03 (25: 15) wt. -%. From the results of data analysis, the values of water absorption for each sample were S-01 (0.00706%), S-02 (0.000496%), S-03 (0.00584%). The lowest wear test was found in the S-03 sample of 3.67 x 10-5 g / mm2.s. The SEM-EDS test results show the distribution of particles in different friction materials for each sample and show that carbon is present in approximately equal amounts in all formulations. The predominance of the presence of metals in brake linings includes: iron (Fe), magnesium (Mg), carbon (C), and aluminum (Al), silicon (Si), potassium (K)

Full-scale dynamometer tests of composite railway brake shoes: Effect of the resin-rubber ratio on friction performance and wear

2021 ◽  
pp. 1-16
Author(s):  
Pablo Monreal ◽  
Neil Harrison ◽  
Eduardo Perez-Costarrosa ◽  
Miguel Zugasti ◽  
Alberto Madariaga ◽  
...  
Keyword(s):  
Failure Modes ◽  
Physical And Mechanical Properties ◽  
Friction Material ◽  
Full Scale ◽  
Friction Materials ◽  
Wear Rates ◽  
Thermal Cracks ◽  
Friction Performance ◽  
Brake Block

Abstract Designing a friction material for a brake system entails considering the effects of each constituent and the interactions that they may present between them. In the present work, a characterization of the influence of the resin-rubber ratio in a brake block material is carried out. Railway brake shoes were produced and tested in a full-scale railway dynamometer in demanding conditions. The brake blocks had also their physical and mechanical properties tested. The progressive addition of resin was proven to heavily affect the friction level in dry and wet conditions. Interestingly, the use of 5% of resin showed significantly higher friction in wet conditions. This composition also presented more severe metal pick-up. The nature of the binder also affected wear rates (which were lower for lower resin contents), and the wear mechanism. The sample using only rubber presented thermal cracks and heavier delamination as specific failure modes. Differences on the microstructure of the friction materials were observed depending on the binder. A 5% of resin appears as a very interesting choice to avoid friction loss in wet environments without incurring in high wear rates, as long as metal pick-up is by different means diminished. Otherwise, a 100% of rubber as a binder grants the instantaneous friction stability that is often threaten by thermal fade.

scholarly journals Effect of silver content on the wear and mechanical properties of powder metallurgical Ti-5Al-2.5Fe-xAg alloys

2020 ◽  
Vol 56 (1) ◽  
pp. 119-125 ◽  
Author(s):  
R. Yamanoglu ◽  
F. Khoshnaw ◽  
I. Daoud ◽  
E. Efendi
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Wear Test ◽  
Hardness Test ◽  
Microstructural Characterization ◽  
Xrd Analysis ◽  
Test Results ◽  
Mechanical Mixing ◽  
Liquid Phases ◽  
Powder Compacts

In the current research, the effect of Ag on the mechanical properties of Ti5Al2.5Fe alloy was investigated. The Ti5Al2.5Fe alloy, with different amounts of Ag ranged from 1 to 5 wt. % was prepared by mechanical mixing and then fabricated by hot pressing at 950?C for 15 min under 50 MPa. Three holding steps were applied to the powder compacts to restrain the liquid phases inside graphite die before reaching the maximum sintering temperature. The sintered samples were subjected to hardness, bending and wear tests to study the effect Ag on the mechanical properties of Ti5Al2.5Fe alloy. The microstructural characterization was carried out by means of optical and scanning electron microscope. The results showed that Ag played a differential role on the mechanical properties supported by microstructural constituents. The bending strength and hardness of the produced samples increased with the addition of Ag, the hardness of the alloys then tended to decrease with increasing Ag content but still remained above the hardness of Ti5Al2.5Fe alloy. Wear test also showed similar trends with hardness test results. Finally, the optimum Ag content for the Ti5Al2.5Fe alloy was determined as 1 wt.%. XRD analysis showed that undissolved Ag content was the main reason for the decrease in the mechanical properties.

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