Glass and Nitrides

NITRIDES and GLASS

• Glass has a high quantity of Silica (SiO2)
• Other ingredients are present in glass besides Silica

ELEMENTS RELATED TO CERAMICS

CARBON

• Graphite and Diamond are two forms of Carbon

SILICON

• Applications of Silicon:
  • Used as a reducing agent in certain metallurgical processes
  • Base material in semiconductor manufacturing in electronics

BORON

• No specific applications or properties mentioned

STRENGTH PROPERTIES OF CERAMICS

COMPRESSIVE STRENGTH IN CERAMICS

• Classification of composites based on Matrix:
  • PMC – Polymer Matrix composites
  • MMC – Metal Matrix composites
  • CMC – Ceramic Matrix composites
• Functions of the Matrix Material:
  • Protect phases from environment
  • Transfer Stresses to phases
  • Share load with secondary phase, in some cases deforming to bear stress
• Why Composites are Important:
  • High strength-to-weight and stiffness-to-weight ratios
  • Better fatigue properties than common engineering metals
  • Higher toughness
  • Resistance to corrosion
  • Possible to achieve combinations of properties not attainable with metals, ceramics, or polymers alone

CLASSIFICATION BASED ON REINFORCEMENT

• Classification of composites based on reinforcement:
  • Particle Reinforcement composites
  • Structural Composites
  • Fiber Reinforcement composites
  • fiber reinforcement types:
    • Continuous fibers with unidirectional aligned
    • Discontinuous fiber and unidirectional aligned
    • Discontinuous fiber and randomly oriented

PARTICLE REINFORCED COMPOSITE

• Characteristics:
  • Cheapest and most widely used
  • Fall into two categories based on particle size:
    • Large-Particle Composites
    • Dispersion-Strengthened Composites
  • Examples:
    • Concrete, ceramics, filled polymers
    • TDNickel with 3% of Thoria

FELDSPAR

• A naturally occurring, industrially important, network silicate with a low melting temperature
• Becomes glass upon firing and bonds refractory components together
• Composition: K2O Al2O3 6SiO2

SILICA (SiO2)

• A polymorphic compound with various forms (quartz, tridymite, and cristobalite)
• Acts as the refractory component of traditional ceramics

CERAMICS

THREE BASIC CATEGORIES OF CERAMICS

• Traditional Ceramics
• New Ceramics

TRADITIONAL CERAMICS

• Examples:
  • Clay
  • Silica (SiO2)
  • Alumina

NEW CERAMICS

• Examples:
  • Oxide Ceramics
  • Carbides