The effect of WC content on the bonding strength and mechanical properties of WC/Ni60 coatings of brake disc

2022 ◽  
Vol 149 ◽  
pp. 107822
Author(s):  
Wanyang Li ◽  
Xuefeng Yang ◽  
Shouren Wang ◽  
Derong Duan ◽  
Fajia Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bonding Strength ◽  
Brake Disc

Effect of Fiber’s Surface Pretreatment on the Interfacial Bonding Strength between Steel Fiber and Resin

2014 ◽  
Vol 989-994 ◽  
pp. 177-180
Author(s):  
Hao Yang ◽  
Jian Hua Zhang ◽  
Guo Yan Sun ◽  
Yi Zhang
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Bonding Strength ◽  
Steel Fiber ◽  
Resin Composite ◽  
Interfacial Bonding ◽  
Steel Fibers ◽  
Surface Pretreatment ◽  
Interfacial Bonding Strength ◽  
Coupling Treatment

For the characteristic that the mechanical properties of resin composite are lower than cast iron, steel fibers are used to improve its properties in this paper. A weak interfacial bonding strength between steel fibers and resin indicates that steel fibers’ property cannot perform well in the polymer. In order to improve the interfacial bonding strength, four methods of surface treatment, phosphating, acid pickling, oxidation, and coupling are applied to steel fibers, and the corresponding pull-off tests are carried out to compare with untreated steel fibers. Research results show that the maximum interfacial bonding strength is increased by 45.1% after coupling treatment.

Polymer-Based Repair Mortar Containing Waste Perlite Powder

2021 ◽  
Vol 898 ◽  
pp. 73-79
Author(s):  
Radek Hermann ◽  
Jakub Hodul ◽  
Aleš Jakubík
Keyword(s):  
Mechanical Properties ◽  
Bonding Strength ◽  
Building Materials ◽  
Expanded Perlite ◽  
High Bonding Strength ◽  
Repair Mortar ◽  
Very High

This paper deals with the problematics of utilization of waste perlite from production of expanded perlite in polymer-based material. The goal of this paper is to develop repair mortar containing as high amount of waste perlite as possible as substitution for filler. The resulting mortar exhibits very high physical-mechanical properties such as high bonding strength to a large variety of building materials. The microstructure and the re-dispersibility of filler were also studied.

Comparison between Tribological Characteristics of Al-Cu-Fe-B Quasicrystalline and Mo Coatings

2007 ◽  
Vol 26-28 ◽  
pp. 715-718
Author(s):  
Bong Hwan Kim ◽  
Sang Mok Lee
Keyword(s):  
Mechanical Properties ◽  
Surface Energy ◽  
Bonding Strength ◽  
Tribological Behavior ◽  
Thermal Spraying ◽  
Microstructural Characterization ◽  
Flame Spraying ◽  
Energy Calculation ◽  
Air Plasma ◽  
Oxygen Fuel

Al-Cu-Fe-B quasicrystalline and Mo coatings were obtained on the mild steel and brass substrates by thermal spraying routes for the purpose of replacement of Mo coatings with quasicrystalline ones. Quasicrystalline coatings were prepared by air plasma spraying and/or HVOF (High Velocity Oxygen Fuel) techniques followed by subsequent heat treatment, and Mo coatings, wire flame spraying. For comparative studies of important properties for industrial application, mechanical properties, bonding strength, surface energy, and tribological behavior were investigated based on microstructural characterization. Basic mechanical properties such as hardness, fracture toughness, and elastic modulus of quasicrystalline coating showed comparable values with those of Mo coatings. De-bonding tests of coatings deposited onto brass substrate indicated that the bonding strength of quasicrystalline coatings obtained by HVOF techniques exhibit higher value to Mo coatings. Non-sticking property analogized from surface energy calculation and friction coefficient of quasicrystalline coatings also showed better performance during the tests. It is suggested from this investigation that the quasicrystalline coating can be effectively used as a replacement of the Mo coating, which has shown a recent steep price rise and problems of accidental existence of minor environment harmful elements such as Cr6+, Pb, Cd, and Hg.

scholarly journals Comparison of Bonding Performance Between Plywood and Laminated Veneer Lumber Induced by High Voltage Electrostatic Field.

2019 ◽  
Vol 275 ◽  
pp. 01013
Author(s):  
Qian He ◽  
Tianyi Zhan ◽  
Haiyang Zhang ◽  
Zehui Ju ◽  
Lu Hong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Voltage ◽  
Electrostatic Field ◽  
Wood Surface ◽  
Bonding Strength ◽  
Surface Characteristics ◽  
Wood Failure ◽  
Photoelectron Spectra ◽  
Masson Pine ◽  
Laminated Veneer Lumber

High voltage electrostatic field (HVEF) was applied in order to improve wood surface characteristics, bonding and mechanical properties of wood composites. Masson pine (Pinus massoniana Lamp.) plywood and laminated veneer lumber (LVL) were selected in this study. Surface characteristics were conducted by the electron spin resonance (ESR) and X-ray photoelectron spectra (XPS). Bonding interphase and mechanical properties were investigated by fluorescence microscopy and vertical density profile (VDP), bonding strength, wood failure ratio, MOE and MOR. The results indicated that more increments were obtained in free radicals, O/C ratios and C2-C4 components. This is because electrons broke more wood chemical groups and new ions occurred among wood surface under HVEF. Significantly decreased PF adhesive penetration depth (PD) and increased density at bonding interphase was achieved in HVEF treated composites. More decrease of PD and increment of density were observed in plywood than that of LVL. This was attributed to cross linked wood fibers among bonding interphase in plywood. Mechanical properties of bonding strength, wood failure ratio, MOE and MOR were significantly increased under HVEF treatment both for two composites. Higher bonding strength, MOE and MOR were obtained in plywood and their increments were as 98.53%, 33.33%, 18.55% and 12.72%.

Repair and cryogenic mechanical properties with resin film infused (RFI) GFRP in out-of-autoclave processing

2020 ◽  
Vol 34 (07n09) ◽  
pp. 2040014
Author(s):  
Yun-Hae Kim ◽  
Kyo-Moon Lee ◽  
Seong-Jae Park ◽  
Kyung-In Jo ◽  
Soo-Jeong Park
Keyword(s):  
Mechanical Properties ◽  
Bonding Strength ◽  
Bending Strength ◽  
High Strength ◽  
Parent Material ◽  
Interfacial Bonding ◽  
Interfacial Bonding Strength ◽  
Resin Film ◽  
Air Pockets ◽  
Cryogenic Mechanical Properties

Prepreg technology generates air pockets at the interface of laminates under heating and pressurization. The air pockets cause defects in the through-thickness direction. This includes poor adhesion between layers, which degrades material properties. Therefore, in this study, cryogenic mechanical properties were compared to obtain uniform properties by using prepreg laminated and resin film infused glass fiber reinforced plastic (GFRP) composites (“PP-only” and “RF-only”, respectively) while maintaining the constituent contents of the fiber and polymer. Moreover, stepped repair was applied to extend the life of composites. The results demonstrated that the stiffness of the composites improved, and the brittleness increased in cryogenic environments. In the case of PP-only, numerous voids were observed inside the polymer, which showed higher bending strength than RF-only; however, it exhibited significantly lower interfacial bonding strength. When applied to secondary bonding of stepped repair, RF-only as repair layers showed high strength recovery rate in homogeneous materials, and not in heterogeneous materials. In contrast, the high strength PP-only as a parent material and RF-only as repair layers showed relatively good interfacial bonding strength due to primary damage in the PP of a parent material. Hence, the RF-only can be considered useful as a repair material.

scholarly journals The Impact of Surface Treatment and Degree of Vacuum on the Interface and Mechanical Properties of Stainless Steel Clad Plate

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1489 ◽  
Author(s):  
Ying-ying Feng ◽  
Huan Yu ◽  
Zong-an Luo ◽  
Guang-ming Xie ◽  
R. Misra
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Surface Treatment ◽  
Bonding Strength ◽  
National Standard ◽  
Vacuum Degree ◽  
Composite Oxides ◽  
Interfacial Bonding Strength ◽  
Stainless Steel Clad Plate ◽  
The Impact

In this study, the impact of different surface treatment and degree of vacuum on the interface and mechanical properties of 304/Q345 stainless steel clad plate was investigated. The study indicated that more continuous or aggregated Al2O3 and Si-Mn composite oxides were formed at the interface after brush grinding. However, less inclusions such as Al2O3, MnS and Ca-Mg-Al-Si composite oxides were formed at the interface after pickling treatment. For the vacuum degrees of 10−2 Pa, 1 Pa and 105 Pa, the oxidation reaction became more intense with the decrease in vacuum degree. The interface inclusions were gradually changed from Al2O3 and Si-Mn complex oxides to oxide scale and MnCr2O4 spinel oxide. The interfacial bonding strength of stainless steel clad plate was improved with the increase in degree of vacuum. The bonding strength was 55 MPa at vacuum of 105 Pa, but it was 484 MPa at vacuum of 10−2 Pa, which is far greater than that of the national standard, and an excellent performance was obtained.

scholarly journals Influence of binder systems on sintering characteristics, microstructures, and mechanical properties of PcBN composites fabricated by SPS

2022 ◽  
Vol 11 (2) ◽  
pp. 321-330
Author(s):  
Shuna Chen ◽  
Hengzhong Fan ◽  
Yunfeng Su ◽  
Wensheng Li ◽  
Jicheng Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Boron Nitride ◽  
Bonding Strength ◽  
Cubic Boron Nitride ◽  
Critical Factor ◽  
High Hardness ◽  
High Porosity ◽  
Plasma Sintering ◽  
Mechanical Performances ◽  
Sintering Characteristics

AbstractCubic boron nitride (cBN) with high hardness, thermal conductivity, wear resistance, and chemical inertness has become the most promising abrasive and machining material. Due to the difficulty of fabricating pure cBN body, generally, some binders are incorporated among cBN particles to prepare polycrystalline cubic boron nitride (PcBN). Hence, the binders play a critical factor to the performances of PcBN composites. In this study, the PcBN composites with three binder systems containing ceramic and metal phases were fabricated by spark plasma sintering (SPS) from 1400 to 1700 °C. The sintering behaviors and mechanical properties of the composites were investigated. Results show that the effect of binder formulas on mechanical properties mainly related to the compactness, mechanical performances, and thermal expansion coefficient of binder phases, which affect the carrying capacity of the composites and the bonding strength between binder phases and cBN particles. The PcBN composite with SiAlON phase as binder presented optimal flexural strength (465±29 MPa) and fracture toughness (5.62±0.37 MPa·m1/2), attributing to the synergistic effect similar to transgranular and intergranular fractures. Meanwhile, the excellent mechanical properties can be maintained a comparable level when the temperature even rises to 800 °C. Due to the weak bonding strength and high porosity, the PcBN composites with Al2O3-ZrO2(3Y) and Al-Ti binder systems exhibited inferior mechanical properties. The possible mechanisms to explain these results were also analyzed.

Automotive Brake Disc Materials

2021 ◽  
Author(s):  
Costel FLOREA ◽  
Costica BEJINARIU ◽  
Nicanor CIMPOESU ◽  
Ramona CIMPOESU
Keyword(s):  
Mechanical Properties ◽  
Material Characterization ◽  
Current Status ◽  
Brake Disc ◽  
Friction Materials ◽  
Automotive Brake

The book reviews the current status of vehicle brake disc materials and technology. Topics covered include friction materials for braking systems, material characterization, mechanical properties, corrosion processes and methods for disc break investigations. The book references 158 original resources with their direct web links for in-depth reading.

Effects on Concrete Bonding of Green Universiti Sains Malaysia Reinforced Concrete (GUSMRC) at Elevated Temperatures

2015 ◽  
Vol 802 ◽  
pp. 166-171
Author(s):  
Nur Liyana Zainal ◽  
Norazura Muhamad Bunnori
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Bonding Strength ◽  
Elevated Temperatures ◽  
High Strength ◽  
Palm Oil Fuel Ash ◽  
New Class ◽  
Sustainable Environment ◽  
Oil Fuel ◽  
Physical And Chemical

The design of the concrete mixtures of Ultra High Performances Fibre Reinforced Concrete (UHPFRC) is related to a densely compacted cementitious matrix and has outstanding material characteristics involving workability and high mechanical properties. Generally it is a combination between high strength concrete and fibres. UHPFRC offers high compressive strength which is higher than a normal concrete. The application of POFA as a cement replacement enhances the transport properties of concrete and contributes to a sustainable environment. The utilization of 50% UPOFA in mix design leads to develop a new class of concrete designated as GUSMRC. GUSMRC mixtures enhance the mechanical behaviour of concrete. GUSMRC with 50% replacement of the total binder content by ultrafine palm oil fuel ash (UPOFA) could contribute sustainability of environmental. The development of UHPFRC and its application in the field may contribute a good bonding strength at interface as a repair material between a new and old material. However, complex properties of materials can change dramatically when exposed to the elevated temperatures and adversely affected. The physical and chemical will change when occurred to heat. This paper investigates the change in mechanical properties of UHPFRC at elevated temperature and to determine the bonding strength between two layers which is overlay and concrete substrate

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