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Advances in Chemical Engineering and Science
Number of Followers: 180

This is an Open Access Journal

Open Access journal
ISSN (Print) 2160-0392 - ISSN (Online) 2160-0406
Published by Scientific Research Publishing

[243 journals]

Fretting behaviour of textured Ti-6Al-4V alloy under oil
lubrication
- Authors: Wenhui Cao, Tianchang Hu, Hengzhong Fan, Qi Ding, Litian Hu
  Pages: 165 - 184
  Abstract: The micro-textures with different dimples densities and diameters are prepared on the Ti-6Al-4V surfaces. The influences of surface texture parameters on the fretting wear behaviours of TC4 self-matching pair have been investigated by using a pin-on-disk machine in a reciprocating sliding mode under different applied loads and fretting frequencies at oil lubrication. Results indicated that the proper texture on titanium alloy can greatly improve the fretting tribological properties under different loads. The 10% texture density surface showed the minimum wear volume at a low fretting frequency, whereas the 20% texture density surface had the lowest wear volume at a high fretting frequency. Under the tested condition, the surface with dimple diameter of 50 μm had the best anti-fretting wear performance under the applied fretting frequencies. In addition, the mechanisms for friction-reducing and anti-wear were discussed. The existence of surface texture promoted the transition from dry friction to boundary lubrication state under high fretting frequency, and the dimples can effectively capture wear debris to alleviate the abrasive wear of the material.
  Keywords: metal wear; fretting; surface texture; oil lubrication
  Citation: International Journal of Surface Science and Engineering, Vol. 15, No. 3 (2021) pp. 165 - 184
  PubDate: 2021-10-15T23:20:50-05:00
  DOI: 10.1504/IJSURFSE.2021.118199
  Issue No: Vol. 15, No. 3 (2021)
System kinetics characteristics of multi-parameter coupling of rolling
mill based on mixed lubrication process of rolling interface
- Authors: Qiaoyi Wang, Pengcheng Yu, Han Wang, Xin Jiang, Huijun Zhao
  Pages: 185 - 201
  Abstract: Based on the theories of rolling, hydromechanics and vibration, a multi-parameter coupling kinetic model was established, in which the interface friction, geometric constraint and stress distribution were modelled for dynamic roll gap. A quantitative analysis was performed on the key parameters affecting the amplitude and critical speed of vertical vibration of the rolling mill. The variation of friction stress and compressive stress in the work zone with time was analysed systematically when the rolling mill was in the mixed lubrication state with a constant reduction rate and surface roughness. The results reveal that the critical vibration speed is directly proportional to the thickness of the workpiece in the outlet zone, the surface roughness of the roll and workpiece, and the roll radius, but inversely to the lubricant viscosity and the thickness of the workpiece in the inlet zone. The amplitude is proportional to the rolling speed, and the compressive and frictional stresses are inversely proportional to the post-tensile stress.
  Keywords: rolling interface; mixed lubrication; multi-parameter coupling; kinetics characteristics; reduction rate
  Citation: International Journal of Surface Science and Engineering, Vol. 15, No. 3 (2021) pp. 185 - 201
  PubDate: 2021-10-15T23:20:50-05:00
  DOI: 10.1504/IJSURFSE.2021.118200
  Issue No: Vol. 15, No. 3 (2021)
Enhanced hardness and friction behaviour of 40Cr steel by laser surface
texturing after ultrasonic surface rolling
- Authors: Zhou Yang, Genshang Wu, Jinggan Shao
  Pages: 202 - 220
  Abstract: This paper constructs a new type of wear-resistant layer on material surface by laser surface texturing and ultrasonic surface rolling. Different from the traditional anti-wear layer, there is no obvious mechanical property difference between the anti-wear layer and material matrix, which can effectively prevent the anti-wear layer falling off and improve fatigue life of material. Meanwhile, the anti-wear layer can also collect wear debris. A hardening layer is formed on the material surface by ultrasonic rolling, and then the surface texturing is machined on the hardening layer by laser. The friction behaviour of anti-wear layer is studied by friction and wears experiment. The experimental results show that the new anti-wear layer has low friction coefficient and surface roughness. The specimen with laser surface texturing (LST) and ultrasonic surface treatment (USR) has more smaller wear depth under the same conditions.
  Keywords: laser surface texturing; LST; ultrasonic surface rolling; anti-wear layer; friction coefficient; wear depth
  Citation: International Journal of Surface Science and Engineering, Vol. 15, No. 3 (2021) pp. 202 - 220
  PubDate: 2021-10-15T23:20:50-05:00
  DOI: 10.1504/IJSURFSE.2021.118202
  Issue No: Vol. 15, No. 3 (2021)
Coatings with embedded particles to increase interfacial anchorage of
steel and GFRP rebars in concrete
- Authors: JosÃ© De JesÃºs PÃ©rez Bueno, Jorge Luis Soto Corral, JosÃ© Luis Reyes Araiza, Maria Luisa Mendoza LÃ³pez, Alejandro Manzano-RamÃrez
  Pages: 221 - 241
  Abstract: Three different types of coatings were studied for protecting rebars against corrosion: sol-gel silica, organic polymer (bisphenol A-fumarate), and organic-inorganic hybrid nanometric compound. This work proposes the addition of particles of about 5 mm in size, heterogeneously distributed, such as recycled glass or sand on the coatings to gain mechanical anchorage between the coated steel rebars and the concrete. This surface change was tested in rebars of fiber-reinforced polymer (GFRP) with fiberglass. The result was that this factor increased the force required for the extraction of the rebars. The low thickness of sol-gel SiO2 coatings made with TEOS was unsuitable for this application. The coatings with polymeric resin offered protection against corrosion in an economical and straightforward form. The organic-inorganic hybrid coatings, using silane coupling agents, provide coatings with adequate protection but depending on the preparation process and a cost increase regarding to the polymeric resin.
  Keywords: hybrid coatings; rebars; concrete; sol-gel; corrosion; fly ash
  Citation: International Journal of Surface Science and Engineering, Vol. 15, No. 3 (2021) pp. 221 - 241
  PubDate: 2021-10-15T23:20:50-05:00
  DOI: 10.1504/IJSURFSE.2021.118203
  Issue No: Vol. 15, No. 3 (2021)
Metallisation of high density polyurethane surfaces
- Authors: BÃ¼ÅŸra ÃœnlÃ¼, Yahya Ã z, Metehan ErdoÄŸan, Ä°shak Karakaya
  Pages: 242 - 264
  Abstract: Electroplating onto polymeric materials is required for different purposes in various applications. Commercial polyurethanes (PU) are electrically insulator materials and durable at high temperatures. Nevertheless, the PU used in this study has a relatively higher electrical conductivity, lower thermal expansion and is a high density foam. In this work, surface metallisation of PU foam was studied to prepare the surface for subsequent electroplating processes. Surface metallisation was carried out by sensitisation, activation and electroless nickel (Ni) plating. Metallised surfaces were characterised according to surface morphologies after electrochemical Ni plating at different current densities and surface preparations. Roughness as well as electrical conductivity of the coatings was investigated. The results show that increasing current density adversely affects the surface morphology and metallisation processes enhance the surface conductivity of the foam.
  Keywords: aerospace engineering; electroless plating; foam surface; metallisation; nickel coating; tool materials
  Citation: International Journal of Surface Science and Engineering, Vol. 15, No. 3 (2021) pp. 242 - 264
  PubDate: 2021-10-15T23:20:50-05:00
  DOI: 10.1504/IJSURFSE.2021.118211
  Issue No: Vol. 15, No. 3 (2021)

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