Physical and Mechanical Characterisation of Asbestos-Free Particulate Ceramic Matrix Composites

Durowaye, Stephen; Sekunowo, O. I.; Lawal, G. I.

doi:10.18038/estubtda.622914

Cited by 4 publications

(5 citation statements)

References 17 publications

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“…Figure 10 is a schematic diagram comparing the shear properties of the geopolymers characterized in this study with typical properties found in literature for various materials 26–46 under V‐notch and Iosipescu testing methods.…”

Section: Resultsmentioning

confidence: 91%

“…Low‐tech ceramics, 42 such as silica‐based binders reinforced with iron oxide granules, can reach maximum shear stresses of 5.5 MPa, with further developments recorded up to 6.0 MPa, 43 through a correct tailoring and improved particle bonding up to a 12% content of iron oxide granules. A ceramic fiber–reinforced silica aerogel matrix, 44 however, may present a reduced shear capacity, with only 0.95 MPa in shear stress, mostly due to the deformability of the matrix and the layered feature of the composites. In fact, highly flexible materials, such as polymeric ones, regularly demonstrate minimum shear moduli (less than 1 GPa) and variable shear stresses (from 0.2 to 30 MPa).…”

Section: Resultsmentioning

confidence: 99%

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V‐notched rail shear test applied to geopolymer composites

2022

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This work presents a systematic study of the shear properties of a potassiumbased geopolymer reinforced with distinct types of fibers. Chopped basalt reinforcements in lengths from 3 mm up to 50 mm and 13 μm in diameter were compared with thicker 20-mm length, basalt mini bars, sand-coated basalt mini rods, and steel fibers. The samples were tested under a V-notched rail shear tests (ASTM D7078), coupled with optical measurements, namely, digital image correlation, allowing a novel study of their crack patterns and failure modes under shear loading. In general, the use of chopped fibers resulted in shear strengths of up to 9 MPa and shear moduli of 4.3 GPa, with no significant variation with fiber length increments, neither in shear stress nor strain at peak load (0.1%). Mini bars and steel fiber reinforcements resulted in slightly lower shear stresses of 7.1 and 8.4 MPa, respectively. They exhibited greater strain values at peak loads, up to 2.1% which were attributed to fiber-matrix enhanced adhesions, thereby allowing gradual debonding and increased ductility. This effect was also recorded for mini rods, but at much lower strength levels, which did not contribute to their multiple cracking capacities. The alignment of the mini rods in 45 • directions resulted in a 50% increase in shear stress, showing the feasibility of tailoring the manufacturing process to attend to distinct demands.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

V‐notched rail shear test applied to geopolymer composites

2022

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“…This style of formulation is no longer based on steel fibre. It has a stable friction coefficient at widespread temperatures [57]. The construction of the material is very complicated since many materials are used in noise reduction.…”

Section: Parameters Influencing the Friction Materials Formulationsmentioning

confidence: 99%

Tribo-mechanical performance of brake composite material: A comprehensive review

Dhinakaran¹,

Katiyar

Ruggiero

2023

Tribology - Materials, Surfaces & Interfaces

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The composite materials are fabricated by combining various ingredients to make higher material properties as required by various industries. The primary classification of composites is based on their build ingredients, such as binder, fibre, reinforcement and fillers. The characteristics of individual ingredients influenced the properties of composites. Further, friction materials are those composite materials efficiently used in vehicles' braking.Researchers have tried the various formulations of friction materials because it is very significant to study the mechanism and material characteristics due to the safety measures of vehicles. The current study examines the various brake composite materials' characteristics and their mechanical and tribological performance in this article. The tribological study includes the various terminologies used in friction and wear using pin-ondisc, dynamometer, field studies, etc. The effects of numerous elements impacting the wear of frictional materials are given, and the tribological performances of used friction materials are given the utmost attention.

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“…Among these, low-carbon steel is widely used as a metallic fibre due to its exceptional heat stability. Ceramic materials, composed of silica and alumina, also improve wear resistance, insulating properties and high-temperature performance [32,34,49]. The addition of different fibres can lead to diverse behaviours in semi-metallic friction materials concerning tribology.…”

Section: Introductionmentioning

confidence: 99%

Development of eco-friendly brake pads using industrial and agro-waste materials

Dirisu,

Okokpujie,

Apiafi

et al. 2024

J. Eng. Appl. Sci.

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There has been an increase in research over the past decades into the use of environmentally friendly materials in brake pads, such as natural fibres. This is due to the possibility that natural fibbers could serve as an alternative to the noxious asbestos materials in tribological applications like brake pads. As a result, utilizing the compacting mould technique, an asbestos-free friction material was developed using agricultural waste (coconut shell and oil bean stalk) as a filler element, alongside aluminium dross, metal chip industrial wastes and carbon black. The filler material considered had particles as small as 300 μm, with epoxy resin serving as the binding agent. Using these waste materials can help reduce environmental pollution and the risk to animal and plant life (Preeti et al., Pharma Innov J 7:94–102, 2018; Sajib, A Study on the effects of environmental pollution on human life in the riverbank area of Barishal City Corporation (Kirtankhola River), 2021). This research aimed to replace asbestos in brake pads due to its carcinogenic nature, reducing the health risks associated with manufacturing and using these brake pads. The brake pad materials were cast and produced using square wooden moulds. Four samples were created, comprising the same mixing ratio but varying in reinforcement fibre and particle size, with epoxy resin used as the matrix. Various tests were conducted on these samples, including a water absorption test, specific gravity test, compressive strength test, hardness test, thermal conductivity, SEM and EDX. The developed brake pads underwent microscopic characterization and structural examination using a scanning electron microscope (SEM) fitted with energy-dispersive X-ray spectroscopy (EDX) for elemental characterization. Thermal conductivity was obtained using automated Lee’s Disc apparatus. Comprehensive strength analysis was conducted using a universal testing machine (UTM).The specific gravity tests yielded values for the developed composites in the range of 1.136–1.257, while the commercial brake pad had a value of 2.081, indicating that the produced samples were lighter and less dense. The water absorptivity of the developed samples ranged from 0.95 to 2.174%, while the commercial brake pad had a value of 1.031%. For the hardness tests, at three different loads, the developed values ranged from 16.4HV3 to 19.4 HV3; 26.4HV30 to 28.7HV30; and 25.5HV100 to 29.6HV100, while the commercial brake pad had values of 16.5HV3, 28.4HV30 and 28.2HV100.Sample C (212 μm: coconut shell powder) exhibited the most desirable characteristics with five values: water absorptivity 0.95, compressive strength 120.5 MPa, hardness value 29.6 HV100, wear resistance 0.099 mm/mm3, specific wear rate 1.00 mm3/Nm. The outstanding values were attributed to the chemical composition, particle sizes and good interfacial bonding of the microstructure.The developed brake pads performed favourably when compared with the existing commercial brake pads. The chemical tests showed that the natural fibres bonded well with the epoxy matrix. The thermal and mechanical tests yielded comparable results with the values obtained from the commercial brake pads. Therefore, the developed materials for brake pads can be considered suitable replacements for asbestos brake pads.

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Physical and Mechanical Characterisation of Asbestos-Free Particulate Ceramic Matrix Composites

Cited by 4 publications

References 17 publications

V‐notched rail shear test applied to geopolymer composites

V‐notched rail shear test applied to geopolymer composites

Tribo-mechanical performance of brake composite material: A comprehensive review

Development of eco-friendly brake pads using industrial and agro-waste materials

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