Tan Chye Lih
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Preferred name
Tan Chye Lih
Official Name
Tan, Chye Lih
Alternative Name
Lih, T. C.
Chye Lih, Tan
Lih, Chye T.
Tan, C. L.
Tan, C. L.C.
Main Affiliation
Scopus Author ID
57125260200
Researcher ID
DYK-2514-2022

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  • Publication
    Electrical discharge coating of NiTi alloy in deionized water
    ( 2021-01-01)
    Jamaluddin R.
    ;
    Tan Chye Lih
    ;
    Roshaliza Hamidon
    ;
    Ahmad Fairuz Mansor
    ;
    Azwan Iskandar Azmi
    Shape memory alloys, specifically nickel-titanium (NiTi), exhibit excellent technical properties that suited them for biomedical applications. However, the release of nickel ions into human body is a drawback because it results in severe adverse health effects as well as degrades the biocompatibility of the alloys. In this work, surface modification through adaptation of electrical discharge machining was used to develop a deposition layer of titanium oxide on NiTi alloy surface. The adaptation was through electrical discharge coatings (EDC) parameters such as polarity, gap voltage, and erosion depth that were set up to study their effects on the experimental performance. The experiment was parameterized by implementing 2 level of full factorial design with ANOVA analysis to measure the surface roughness of that machined surface. One-factor-at-a-time, OFAT method is applied for XRD analysis by adopting the previous parameters approach. The EDC process was aided with deionized water and pure titanium rod as the dielectric fluids and electrodes, respectively. It was determined that the high level of gap voltage provided some major constituents on the surface of NiTi alloy based on XRD analysis. As apparent, this substantiated the presence of the tool materials and their oxide layer phases. The interaction of polarity and gap voltage also indicated a significant effect towards the surface roughness.
      38  1
  • Publication
    Surface roughness analysis of NiTi alloy in electrical discharge coating process
    ( 2020-12-18)
    Jamaluddin Roshalliza
    ;
    Tan Chye Lih
    ;
    Ahmad Fairuz Mansor
    ;
    Azwan Iskandar Azmi
    ;
    Roshaliza Hamidon
    Nickel-Titanium (NiTi) alloys, most widely known as nitinol, are presently employed in many micro-engineering applications such as coronary stents of medical implants due to their unique properties (shape memory effect and superelasticity). However, non-optimized surface finishing attributed a significantly high potential of nickel exposure after a long time of application. Releasing of nickel ion to the body environment can be harmful and toxicity resulting in adverse health as well as degrading the material biocompatibility. It is widely known that controlled surface roughness play a vital role in the formation of new bone ingrowths around implant. In this study, surface modification of NiTi alloy was used through electrical discharge coating (EDC); an adaptation of electrical discharge machining. The potential of EDC in which can facilitates the production of hard coatings may exploit the phenomena for the attachment of desirable materials onto the surface of materials. Therefore, the aim of this paper is to present a robust method (two levels of full factorial design and ANOVA) to determine the desired parameters and significant factors based on the surface roughness of the machined surface. Manipulation of parameters set up such as gap voltage, discharge duration and pulse interval and the current were employed and a reverse polarity was selected for this experiment. The results demonstrated that the most significant factors influence the surface coating performances are the discharge duration, current, gap voltage as well as the interaction between gap voltage and discharge duration.
      5  33
  • Publication
    Effects of machining conditions on the specific cutting energy of carbon fibre reinforced polymer composites
    ( 2017-10-29)
    Azwan Iskandar Azmi
    ;
    Syahmi A.
    ;
    Naquib M.
    ;
    Tan Chye Lih
    ;
    Ahmad Fairuz Mansor
    ;
    Khalil A.
    This article presents an approach to evaluate the effects of different machining conditions on the specific cutting energy of carbon fibre reinforced polymer composites (CFRP). Although research works in the machinability of CFRP composites have been very substantial, the present literature rarely discussed the topic of energy consumption and the specific cutting energy. A series of turning experiments were carried out on two different CFRP composites in order to determine the power and specific energy constants and eventually evaluate their effects due to the changes in machining conditions. A good agreement between the power and material removal rate using a simple linear relationship. Further analyses revealed that a power law function is best to describe the effect of feed rate on the changes in the specific cutting energy. At lower feed rate, the specific cutting energy increases exponentially due to the nature of finishing operation, whereas at higher feed rate, the changes in specific cutting energy is minimal due to the nature of roughing operation.
      32  1