A Chanda

Publications (5)4.9 Total impact

• Article: Sliding wear behavior of submicron-grained alumina in biological environment.

  R Singha Roy, A Mondal, A Chanda, D Basu, M K Mitra
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  ABSTRACT: Sliding wear behavior of sintered alumina with grain sizes between 0.45 and 4 microm was studied in bovine serum environment with unidirectional pin-on-disc wear testing machine. Submicron grained alumina of average grain size of G=0.45 microm exhibits lowest wear factor among the others. It was found that grain pull out or localized grain dislodgement caused by coalescence of grain boundary microcracks is the basic wear mechanism of submicron grained alumina though the extent of cracking and pull-out was substantially less than that with higher grained material. However, in few cases, some areas where substantial volume of material was removed following pull-out of cluster of grains have also been observed.
  Journal of Biomedical Materials Research Part A 12/2007; 83(2):257-62. · 2.63 Impact Factor
• Article: Distinct Wear Characteristics of Submicrometer‐Grained Alumina in Air and Distilled Water: A Brief Analysis on Experimental Observation

  R. Singha Roy, D. Basu, A. Chanda, M. K. Mitra
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  ABSTRACT: Sliding wear behavior of submicrometer-grained (grain size=0.45 μm) alumina was investigated in air and distilled water and the result was compared with the wear characteristics of similar material with coarser grain sizes. Experiments were conducted with a pin-on-disk wear-testing machine under identical test conditions. Alumina with submicrometer grain size exhibits substantially higher wear resistance compared with the coarser-grained materials in both the environments. Scanning electron micrograph of the wornout samples revealed that in air, formation and subsequent degeneration of the compacted layer of wear-debris on the sliding surface govern the wear loss. In distilled water, no compacted layer was observed and in such cases, grain pullout through coalescence of microcracks along grain boundaries was found to be the dominant mechanism of wear.
  Journal of the American Ceramic Society 07/2007; 90(9):2987 - 2991. · 2.27 Impact Factor
• Article: A new parameter for measuring wear of materials

  A. CHANDA, D. BASU, A. DASGUPTA, S. CHATTOPADHYAY, A. K. MUKHOPADHYAY
  Journal of Materials Science Letters 09/1997; 16(20):1647-1651.
• Article: Improved sliding wear-resistance of alumina with sub-micron grain size: A comparison with coarser grained material

  R. Singha Roy, H. Guchhait, A. Chanda, D. Basu, M.K. Mitra
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  ABSTRACT: Un-lubricated sliding wear behaviour of sub-micron grained (average grain size, G = 0.45 μm), self-mated alumina was studied using conformal-contact with a unidirectional pin-on-disc wear testing machine. The wear characteristics of higher grained alumina samples (G = 0.95 and 4 μm) are also studied under self mating condition for comparative analysis by using similar test parameters and identical test configuration. Sub-micron grained alumina exhibits substantially higher wear resistance compared to the alumina of larger grain size. Scanning electron microscopy of the worn out test samples reveals that in un-lubricated condition, compaction of wear debris on sliding surface governs the wear characteristics of the present set of alumina. In many cases, partly revealed intergranular fracture was noticed. The strength of adhesion of the compacted wear debris with sliding surface increases with decreasing grain size. In case of alumina of larger grain size, the stability of the compacted layer decreases due to cracking. For sub-micron grained alumina, compacted layer of debris with increased adherence efficiently protects the virgin material resulting substantial decrease in wear loss.
  Journal of the European Ceramic Society.
• Article: Wear and friction behaviour of UHMWPE-alumina combination for total hip replacement

  A. Chanda, A.K. Mukhopadhyay, D. Basu, S. Chatterjee
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  ABSTRACT: The wear and friction behaviour of ultra high molecular weight polyethylene (UHMWPE) against high purity fine grained alumina, the ideal material combination for total hip joint prosthesis, were studied under different contact pressures and sliding velocities using a pin-on-disc type wear and friction monitor. The wear heights in wet conditions were found to be much lower than those in dry conditions, which followed a power law relationship with load after 3–5 km of sliding. Efforts were also made to find out the sequence of dominating wear mechanisms.
  Ceramics International.