Effect of Arc Spraying Power on the Microstructure and Mechanical Properties of Pb-Sn Coating Deposited onto Carbon Fiber Reinforced Epoxy Composites
In this study, Pb-Sn coatings were deposited on carbon fiber reinforced epoxy composites (CFRE composites) by means of plasma spraying as a permeation barrier in the applications of composite pressure vessels. The bonding strength of the Pb-Sn coatings-substrates with different plasma spraying power was tested on a RGD-5 tensile testing machine. The microstructures of the as-sprayed coatings have been examined by scanning electron microscopy (SEM), respectively. The result showed that the melting extent and the bond strength of the coatings were evidently improved with the increasing of spraying power. Observation of fracture surfaces shows that carbon fiber bundles can bond well with Pb-Sn coatings using 42 kW spraying power.
To deal with the market demand and the production organization feature of steel making enterprises,we formulate the optimization of charge design as a cluster analysis problem with quality constraints on chemical compositions.A particle-swarm-optimization-based(PSO-based) solution is proposed for reducing the dimensions based on the principal component analysis(PCA) techniques.The range constraints of chemical compositions for products with similar quality are introduced in terms of traditional process constraints,due time constraints and furnace capacity constraints,etc.The solution adopts an integration schema for charge plan and quality design.It performs the cluster analysis for candidate products with similar chemical compositions and constraints to realize the optimal charge design under quality constraints on steel products of multiple varieties and in small batch demands.