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Characteristics and mechanism of abrasive wear for thermoplastic polymers

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Journal of University of Science and Technology Beijing 2003年第5期10卷 44-47页

作者： XianJia XiaomeiLing departmentofscienceandtechnology UniversityofScienceandTechnologyBeijingBeijing100083China DepartmentofAnalyticalChemistry SchoolofPharmaceuticalSciencePekingUniversityBeijing100083China

Abrasive wear characteristics of polyethylene, polystyrene,polymethylmethacrylate, nylon 1010 and polyvinyl chloride were investigated. The volume relativewear resistance coefficients of these thermoplastic polymers are 18%-35% (hardened and lowtemperature tempered steel 45 was used as a comparing material), and have a linear correlation withsquare roots of their cohesive energy densities. The coefficients of linear correlation is *** morphologies were observed by scanning electron microscope (SEM). Main wear mechanism of thethermoplastic polymers includes brittle breaking for the hard and brittle polymers & plowing andfatiguing for the soft and tough ones.

关键词： polymer abrasive wear wear mechanism cohesive energy

Influence of composition on friction-wear behavior of composite materi-als reinforced by brass fibers

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Rare Metals 2003年第4期22卷 265-269页

作者： JIAXian LINGXiaomei departmentofscienceandtechnology UniversityofScienceandTechnologyBeijingBeijing100083China DepartmentofAnalyticalChemistry SchoolofPharmaceuticalSciencePekingUniversityBeijing100083China

In the study, for the composite materials reinforced by brass fibers, theinfluence of dominant ingredients, such as organic adhesion agent, cast iron debris, brass fiber,and graphite powder, on the friction-wear characteristics was investigated. The friction-wearexperiment was carried out on the block-on-ring tribometer MM 200. The worn surfaces of the frictionpair consisting of the composite materials and grey cast iron HT 200 under dry sliding frictionwere examined using scanning electron microscope (SEM), energy dispersive analysis (EDX) anddifferential thermal analysis-thermogravimetric analysis (DTA-TAG). The experimental results showedthat the friction coefficient and the wear loss of the composite material increase obviously withthe increase of cast iron debris content, but decrease obviously with the increase of graphitepowder content, and increase a little when the mass fraction of brass fiber was over 19 percent, andthe orientation of brass fiber has obvious influence on friction-wear property. When the massfraction of organic adhesion agent was about 10-11 percent, the composite materials have anexcellent friction-wear performance. The friction heat can pyrolyze organic ingredient in wornsurface layer.

关键词： composite material friction wear brass fiber

Abrasive wear characteristics and mechanisms of Al_2O_3/PA1010 composite coatings

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Rare Metals 2004年第1期23卷 59-63页

作者： JIAXian LINGXiaomei departmentofscienceandtechnology University.ofScienceandTechnologyBeijing.Beijing100083.China DepartmentofAnalyticalChemistry SchoolofPharmaceuticalScience.PekingUniversity.Beijing100083China

The abrasive wear characteristics of Al_2O_3/PA1010 composite coatings on thesurface of quenched and low-temperature temper steel 45 were tested on the template abrasive weartesting machine and the same uncoated steel 45 was used as a reference material. Experimentalresults showed that the abrasive wear resistance of Al_2O_3/PA1010 composite coatings has a goodlinear relationship with the volume fraction of Al_2O_3 particles in Al_2O_3/PA1010 compositecoatings, and the linear correlative coefficient is 0.979. Under the experimental conditions, thesize of Al_2O_3 particles (40.5-161.0 μm) has little influence on the abrasive wear resistance ofAl_2O_3/PA1010 composite coatings. By treating the surface of Al_2O_3 particles with a suitablebonding agent, the distribution of Al_2O_3 particles in matrix PA1010 is more homogeneous and thebonding state between Al_2O_3 particles and matrix PA1010 is better. Therefore, the Al_2O_3particles in Al_2O_3/PA1010 composite coatings make the Al_2O_3/PA1010 composite coatings havebetter abrasive wear resistance than PA1010 coatings. The wear resistance of Al_2O_3/PA1010composite coatings is about 45% compared with that of steel 45.

关键词： composite material coating abrasive wear Al_2O_3 nylon

Synthesis and characteristics of SiC whiskers with "rosary bead" morphology

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Journal of University of Science and Technology Beijing 2004年第1期11卷 39-43页

SiC whiskers with 'rosary bead' morphology were synthesized using suitablesilicon source and carbon source through solid reaction at the temperature above 1537 K. Thediameter and length of the SiC whiskers were about 0.1-1.0 μm and 20-100 μm, respectively. Thelargest diameter of their enlarged ends of the whiskers was about 0.2-1.0μm, and it gradually andsmoothly decreased to the size of the plain part of the whiskers. The results of X-ray diffractionanalysis show that the crystalline structure of the obtained SiC whiskers is β-SiC. It isconsidered that the SiC whiskers grow via a vapor-solid mechanism.

关键词： SiC whisker synthesis crystalline structure