東北大学
学際科学フロンティア研究所

新領域創成研究部

Chrystelle BERNARDChrystelle BERNARD

助教デバイス・テクノロジー

メンター教員
教授
小川 和洋(大学院工学研究科)
研究分野 Dynamics behavior of polymers, cold-spray
主な研究テーマ
  • Thermomechanical behavior of polymers during cold-spray process
  • Understanding of the adhesion mechanisms occurring during cold-spray process
  • Academic Society Membership: Mechanical French Association
所属学会 Mechanical French Association
研究概要  

Cold-spray (CS) process is an interesting technology which allows welding different materials to form a layer protecting structure. It consists in projecting at high speed, against a substrate, powdered materials through a nozzle using a pressurized gas. Relative good understanding of CS was achieved for metallic powders and substrates. Since few years, some researches [1,2,3] have been focused on cold-spraying polymer particles. Contrary to metals, polymers exhibit high sensitivity to strain rate and temperature. Using an empirical approach, the addition of nanoalumina particles allowed obtaining thick and porous coatings. However, the role of these particles on the adhesion mechanisms during CS process is still unknown.

My research aims to improve CS process through a better understanding of the formation and growth of the polymer coating. These steps depend on the balance between kinetics, rebound and adhesion energies. This requires the knowledge of the polymer behavior law, at ultra-high strain rate and strong temperature gradient, and its implementation in finite element software to simulate CS process.

[1] Development of Ultra-High Molecular Weight Polyethylene (UHMWPE) Coating by Cold Spray Technique, Journal of Thermal Spray Technology, 24 (6), 1015-1025, 2015. [2] Mechanistic Study and Characterization of Cold-Sprayed Ultra-High Molecular Weight Polyethylene-Nano-ceramic Composite Coating, Journal of Thermal Spray Technology, 25 (1-2), 160-169, 2016. [3] International Patent US 20170152601 A1

関連記事一覧

    PAGE TOP