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Lecture 23 – Composite Materials Lecture 23 – Composite Materials

Lecture 23 – Composite Materials - PowerPoint Presentation

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Lecture 23 – Composite Materials - PPT Presentation

Composite Materials Engineering Materials and Processes Reference Text Section Higgins RA amp Bolton 2310 Materials for Engineers and Technicians 5th ed Butterworth Heinemann Ch 23 ID: 636785

higgins materials engineering processes materials higgins processes engineering hardened particle composites particles matrix bonding concrete explain dispersion material composite

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Slide1

Lecture 23 – Composite MaterialsSlide2

Composite Materials

Engineering Materials and Processes

Reference Text

Section

Higgins RA & Bolton, 2310.

Materials for Engineers and Technicians, 5th ed, Butterworth HeinemannCh 23

Reference Text

SectionSlide3

Composite Materials (Higgins 23)

Engineering Materials and Processes

‘Composites‘ are mixtures of two separate components, one being the matrix (glue), the other giving strength/hardness/stiffness usually as particles or fibres.

This chapter is particle composites, next chapter fibre composites

Roman Cage Cup from the 4th century CE

Moldavite, a natural glass formed by meteorite impact, from Besednice, BohemiaA modern greenhouse in Wisley Garden, England, made from float glassSlide4

23.1 Introduction (Higgins 23.1)

Engineering Materials and Processes

Higgins

23.1.1 Particle composites

Particle-hardened composites

Dispersion-hardened composites'Filler' compositesTo make sure the particle stick (cohesion);Mechanical bonding (rough surface)Physical bonding (Van der Waals)Chemical bondingSolid-solution bondingSlide5

23.2 Particle-hardened composites (Higgins 23.2)

Engineering Materials and Processes

Higgins

These are generally the products of powder metallurgy in which extremely hard particles of a ceramic material are held in a tough ductile matrix of some metal. Such materials are called

cermets

and are used for cutting tools and die materials.Slide6

23.2 Particle-hardened compositesEngineering Materials and ProcessesSlide7

23.2 Particle-hardened composites (Higgins 23.2)

Engineering Materials and Processes

HigginsSlide8

23.3 Dispersion-hardened materials (Higgins 23.3)

Engineering Materials and Processes

Higgins

Small particles impede slip in the matrix.

23.3.1 Sintered aluminium powder (SAP)

Slide9

23.3 Dispersion-hardened materials (Higgins 23.3)

Engineering Materials and Processes

Higgins

23.3.2 Manufacturing processes

23.3.3 Modern superalloysSlide10

23.4 Mortar and concrete (Higgins 23.4)

Engineering Materials and Processes

Higgins

23.4.1 Mortar

23.4.2 ConcreteSlide11

23.5 Tarmacadam (Higgins 23.5)

Engineering Materials and Processes

HigginsSlide12

Engineering Materials and Processes

Wikipedia: Concrete

Resources.Slide13

Glossary

Engineering Materials and Processes

Cohesion

Mechanical bonding

Physical bonding

Chemical bondingSolid-solution bondingCermetsSinteringMatrixMechanical alloyingAggregateRich and leanCement/aggregate ratioPortland cementDispersion hardened materialSlide14

QUESTIONSHiggins Ch23, Newell, Timmings, Sheedy, Callister

, Ashby

Define all glossary terms

Explain the issues of making strong concrete regarding water ratio, cement ratio, aggregate and sand, curing time and temperature, curing humidity. Explain what would be done to achieve high strength and low shrinkage.

What is a

cermet and what are they used for? Give some examples of cermets and explain what properties they have that make them suitable for their purpose. Give five reasons for a particle to be added to a matrix – include a range of different types of particle composites.Explain how small particles can strengthen a ductile metal matrix even when the particles are rounded. (Dispersion hardened material).Engineering Materials and Processes