This study examines the mechanical and thermal behavior of ten ceramic formulations(C1 to C10)prepared from two types of specimens:Cylindrical Pure clay Specimens(CPC-SP)and Bone Ash Clay Specimens(BAC-SP).The raw mat...This study examines the mechanical and thermal behavior of ten ceramic formulations(C1 to C10)prepared from two types of specimens:Cylindrical Pure clay Specimens(CPC-SP)and Bone Ash Clay Specimens(BAC-SP).The raw materials,sourced from the Missole II clay formation(Douala,Cameroon),were homogenized at room temperature and compacted into cylindrical molds with 10%water to ensure adequate plasticity and shaping.A total of 100 specimens(five replicates per formulation)were produced under a load of 8.8 N to ensure statistical reliability.Firing experiments,conducted between 750 and 1250˚C,showed that BAC-SP specimens retained 3%residual moisture and exhibited superior mechanical performance,with an average Young’s modulus of 6.6 GPa and a fracture stress of 2.56 MPa,compared with 3.56 GPa and 1.66 MPa for CPC-SP.A weight loss on ignition between 1.8 and 2%was recorded in the range of 1120 to 1144˚C,while Poisson’s ratio remained constant at 0.5 for both materials.The incorporation of bovine bone ash significantly enhances the strength and thermal stability of ceramics,offering promising opportunities for optimizing firing conditions and extending their use in advanced technological applications.展开更多
This article investigates into the physical and thermo mechanical properties of a friction composite material based on ox horn and phenolic resin.The tests revealed that an intermediate density of 100μm offers a good...This article investigates into the physical and thermo mechanical properties of a friction composite material based on ox horn and phenolic resin.The tests revealed that an intermediate density of 100μm offers a good balance between density and homogeneity.Increasing the horn particles fraction reduces the density of the composite,thereby influencing its compactness and porosity.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)morphology analysis revealed that fine particles(50μm)provide good dispersion and promote porosity.Intermediate particles(100μm)offer the best balance of cohesion,low porosity and good mechanical performance.Coarse particles(300μm)provide greater density but less effective interfacial adhesion.The compressive strength of the composite depends heavily on particle size and horn particles fraction.The static friction coefficient of the horn particles and phenolic resin composite(100μm)is 0.42/0.35(for Kevlar-based brake linings)and 0.40(for carbon fibre-based linings).Wear tests have proven that the ox horn and phenolic resin composite varies between 2.5-3.0(mm^(3)/Nm)and 1.5-2.0(mm^(3)/Nm).展开更多
文摘This study examines the mechanical and thermal behavior of ten ceramic formulations(C1 to C10)prepared from two types of specimens:Cylindrical Pure clay Specimens(CPC-SP)and Bone Ash Clay Specimens(BAC-SP).The raw materials,sourced from the Missole II clay formation(Douala,Cameroon),were homogenized at room temperature and compacted into cylindrical molds with 10%water to ensure adequate plasticity and shaping.A total of 100 specimens(five replicates per formulation)were produced under a load of 8.8 N to ensure statistical reliability.Firing experiments,conducted between 750 and 1250˚C,showed that BAC-SP specimens retained 3%residual moisture and exhibited superior mechanical performance,with an average Young’s modulus of 6.6 GPa and a fracture stress of 2.56 MPa,compared with 3.56 GPa and 1.66 MPa for CPC-SP.A weight loss on ignition between 1.8 and 2%was recorded in the range of 1120 to 1144˚C,while Poisson’s ratio remained constant at 0.5 for both materials.The incorporation of bovine bone ash significantly enhances the strength and thermal stability of ceramics,offering promising opportunities for optimizing firing conditions and extending their use in advanced technological applications.
文摘This article investigates into the physical and thermo mechanical properties of a friction composite material based on ox horn and phenolic resin.The tests revealed that an intermediate density of 100μm offers a good balance between density and homogeneity.Increasing the horn particles fraction reduces the density of the composite,thereby influencing its compactness and porosity.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)morphology analysis revealed that fine particles(50μm)provide good dispersion and promote porosity.Intermediate particles(100μm)offer the best balance of cohesion,low porosity and good mechanical performance.Coarse particles(300μm)provide greater density but less effective interfacial adhesion.The compressive strength of the composite depends heavily on particle size and horn particles fraction.The static friction coefficient of the horn particles and phenolic resin composite(100μm)is 0.42/0.35(for Kevlar-based brake linings)and 0.40(for carbon fibre-based linings).Wear tests have proven that the ox horn and phenolic resin composite varies between 2.5-3.0(mm^(3)/Nm)and 1.5-2.0(mm^(3)/Nm).
