22 SQ: Cleaning and Coating

What is the aim of cleaning?

• Removal of contamination

• Achieve required surface characteristics for subsequent processes

Name the five different processes of cleaning?

• Ultrasonic cleaning

• CO₂ Snow-jet Cleaning

• Brushing

• Laser beam cleaning

• Plasma Cleaning

What factors should be considered to select the appropriate cleaning process?

• As good as necessary and not as good as possible

• High capacity, high quality, low cost

Which cleaning method do you choose for removing thin layers in sub-milimiter range?

• Laser beam cleaning

What are the advantages and disadvantages of a visual inspection as an analysis method?

• + Low cost

• + Low effort

• + Short

• - No reproduceable

• - Subjective

What is the aim and purpose of coating?

• Prevention and/or Restoration

• Reduce abrasion

• Increase resistance to external influences

• Supplement missing material

• Create certain surface properties

List at least five states of coating agents that are available

• Liquid State

• Solid State

• Vapour State (Vapour Deposition)

• Plastic State

• Ionized State (Plasma Deposition)

What is the difference of sizing compared to avivages?

• Sizing: glass and carbon fibers

• Avivage: aramid fibers

How is the fiber changed by adding sizing or avivage?

• Enables roving formation to further processing

• Enhances resitance to external influences and mech. props. to a certain degree

• Can promote adhesion between fibers and the matrix

Explain the trade-off by sizing fibers

• Sizing improve wear resistance, mechanical properties and enables further processing of the fiber boundles, but can lead to interface failure between fibers and matrix