Thermal spraying is the name of a large group of coating deposition techniques used to deposit thick layers for a variety of applications. The principle is to melt the material, and rapidly propel the droplets towards a substrate where they flatten and solidify. When properly used, the substrate is not significantly heated. Spraying enables deposition of practically any material with a stable molten phase, on any solid material. Sprayed ceramics are used to reduce wear by sliding and by hard particles. However, due to the defect-filled microstructure resulting from spraying, the coatings typically have poor mechanical and tribological properties compared to dense, sintered materials…
Contents
1. INTRODUCTION
1.1 Tribology
1.3 Thermal spray technology
1.4 Thermal spray coatings and their applications
1.5 Typical microstructure and properties of thermal sprayed ceramic coatings
1.6 Sealing of thermal spray coatings
2. SYNTHESIS OF COATINGS IN THE PRESENT WORK
2.1 Coatings for evaluation of spray parameters (Papers I-III)
2.2 Coatings to be sealed (Papers IV-VII
2.3 Sealing of sprayed coatings (Papers IV-VII)
2.3.1 Sealing by electro-deposition (Papers IV-VII)
3. MICROSTRUCTURAL AND MECHANICAL PROPERTIES
3.1 Micro-structure
3.1.1 Alumina sprayed with different parameters (Papers I-III)
3.1.2 Sealed coatings (Papers IV-VII)
3.2 Hardness
3.2.1 Coatings sprayed with different parameters (Paper I)
3.2.2 Sealed coatings (Papers IV-VII)
3.3 Indentation testing (Papers V and VII)
3.4 Bend testing (Papers I-III)
4. TRIBOLOGICAL PROPERTIES
4.1 Abrasion
4.1.1 Alumina sprayed with different parameters (Papers I-III)
4.1.2 Sealed coatings (Papers IV and V)
4.2 Scratch testing
4.2.1 Alumina sprayed with different parameters (Paper I)
4.2.2 Sealed coatings (Papers IV, V and VII)
4.3.2 Sealed coatings (Papers IV and V)
4.3.1 Alumina sprayed with different parameters (Papers I-III)
4.3 Particle erosion
4.4 Tribology in sliding contact (Papers IV-VII)
4.4.1 Sliding friction
4.4.2 Sliding wear
5 FUTURE WORK
6. CONCLUSIONS
REFERENCES
Author: Westergard, Richard
Source: Uppsala University Library
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