Flashcards in this deck (39)

• What is the definition of glass?

  A hard, brittle material typically made by heating silica sand with soda and lime.
  properties definition
• What is Glass Transition Temperature (Tg)?

  The temperature at which glass transitions from a hard and brittle state to a plastic state.
  properties tg
• What are the types of glass?

  • Float glass
  • Tempered glass
  • Laminated glass
  • Borosilicate glass
  types glass
• List some applications of glass in industries.

  • Construction
  • Packaging
  • Electronics
  • Medical devices
  applications industries
• What are the properties of glasses?

  • Transparency
  • Hardness
  • Chemical resistance
  • Thermal insulation
  properties glass
• Identify a characteristic of broken glass.

  It is fragmented into many small, irregular shapes held together in a network.
  characteristic glass
• How is tempered glass different from regular glass?

  It is treated thermally to increase its strength and thermal resistance.
  types glass
• What are the primary properties of glasses?

  • Transparency
  • Hardness
  • Brittleness
  • Chemical stability
  materials properties
• Define glass in terms of its structure.

  An amorphous solid that lacks a long-range ordered structure.
  materials definition
• What is the Glass Transition Temperature (Tg)?

  The temperature range where glass transitions from a brittle state to a malleable state.
  materials thermodynamics
• List the types of glass and their general uses.

  • Float glass: Windows
  • Borosilicate glass: Labware
  • Soda-lime glass: Containers
  materials types
• Define glass.

  An amorphous solid made primarily of silica.
  materials definition
• What is the structure of glass?

  Disordered arrangement of atoms, lacking a crystalline structure.
  materials structure
• Define the Glass Transition Temperature (Tg).

  The temperature at which glass transitions from a hard to a rubbery state.
  materials thermal_properties
• What factors determine the composition of glass?

  • Silica content
  • Additives (like soda and lime)
  • Intended application
  materials composition
• What kind of structure does glass have?

  Non-crystalline (vitreous) or amorphous structure with molecules in random orientations.
  structure glass
• Do the molecules in glass have long-range order?

  No, they are not arranged in a regular repetitive long-range order.
  molecules glass
• What type of order do the molecules in glass have?

  They have short range order.
  molecules structure
• What is the basic component of inorganic glasses?

  Silica (\(SiO_2\))
  materials glass
• What type of materials do not solidify like crystalline materials?

  Glassy or non-crystalline materials
  glass materials
• How does a glass behave when cooled?

  It becomes more viscous continuously with decreasing temperature.
  glass properties
• Above the glass transition temperature, what state is glass in?

  First a super-cooled liquid, then a liquid.
  materials glass states
• How does the volume of crystalline materials behave as they solidify?

  Solidify sharply at the melting temperature (Tm).
  materials crystallization
• What defines the non-crystalline state of a material?

  The characteristic glass transition temperature, Tg.
  materials glass
• What defines the Glass Transition Temperature (Tg)?

  The point of intersection of the two slopes in the specific volume vs. temperature curve.
  glass tg
• What effect do faster cooling rates have on Tg?

  They produce higher values of the Glass Transition Temperature (Tg).
  glass properties
• Name the primary properties of glasses.

  • Transparent
  • Brittle
  • Non-crystalline
  glass properties
• What is the melting point of glass?

  Temperature at which viscosity is 10 Pa-s; glass is fluid.
  glass viscosity melting_point
• What are common types of glass?

  • Float glass
  • Laminated glass
  • Tempered glass
  • Photovoltaic glass
  glass types applications
• How do alkaline earth oxides like CaO affect glass?

  They help reduce viscosity and improve workability.
  materials glass
• What is a characteristic of modified glass like soda-lime glass?

  It has a network where Na+ does not integrate into the structure.
  glass types
• What is a characteristic of intermediate oxide glass?

  It includes Al3+ cations that are integrated into the glass network.
  glass types
• What is the melting temperature characteristic of fused silica?

  Very high melting temperature, shock resistant.
  glass fused_silica
• Identify the characteristics of soda-lime glass.

  • Low melting temperature
  • Durable
  • Easily worked
  glass soda_lime
• What industrial application is fiberglass commonly used for?

  Used in glass-resin composites.
  glass fiberglass
• What is the most commonly produced glass?

  Soda-lime glass accounts for about 90% of all glasses produced.
  glass composition
• What are some uses of soda-lime glass?

  • Flat glass
  • Containers
  • Pressed and blown ware
  • Lighting products
  glass applications
• List one advantage of fused silica glass.

  Not subject to radiation damage.
  materials advantages
• Why are lead glasses used for some optical and decorative glasses?

  They have a high refractive index
  materials optics