What Is A Refractory Material In Dentistry?


Dental investments and refractory materials (part 1)

A refractory is a non metallic material with can with stand high temperature without degrading , softening or losing its strength. A investment is a ceramic material which is suitable for forming a mold into which a molten metal or alloy is cast.



Which one of the following is a ceramic material Mcq?

Ceramic materials are brittle, hard, strong in compression, and weak in shearing and tension. Some of the most common ceramics are aluminum oxide, silicon dioxide, silicon carbide, earthenware, porcelain, and brick, etc.


Which one of the following is not a basic refractory Mcq?

Chromate, Carbide, Mullite, etc. 4. Which one of the following is not a basic refractory? Explanation: Most of the silica-based refractories, like fire clay, bricks and sand are of acidic refractories.


What is not neutral refractory?

Not affected by the addition of basic oxides.


What is refractory material used for?

Refractory materials are used in furnaces, kilns, incinerators, and reactors. Refractories are also used to make crucibles and moulds for casting glass and metals and for surfacing flame deflector systems for rocket launch structures.


What is the meaning of refractory material?

Refractories are materials that are resistant to high temperature, used predominantly as furnace linings for elevated temperature materials processing and other applications in which thermomechanical properties are critical.


Which one of the following is a ceramic material?

Ceramics are more than pottery and dishes: clay, bricks, tiles, glass, and cement are probably the best-known examples. Ceramic materials are used in electronics because, depending on their composition, they may be semiconducting, superconducting, ferroelectric, or an insulator.


Which of the following is NOT a ceramic material?

Detailed Solution

Organic materialsInorganic materialsSynthetic polymers
AmberAsbestosPoly-ethylene
CottonCeramicsPerspex
PaperGlassPoly-propylene
Press boardMicaPoly-styrene


What is a refractory material in dentistry?

Dental investments and refractory materials (part 1)

A refractory is a non metallic material with can with stand high temperature without degrading , softening or losing its strength. A investment is a ceramic material which is suitable for forming a mold into which a molten metal or alloy is cast.


What is neutral refractory material?

i. A refractory that is neither strongly basic nor strongly acid, such as chrome, mullite, or carbon.


What is refractory give an example?

The definition of refractory is stubborn or hard to manage, or heat resistant. An example of someone who is refractory is a person who refuses to listen to the rules. An example of something refractory is a material like silica or alumina that are difficult to melt.


Which is the example of neutral refractory?

Neutral refractories – Neutral refractories are chemically stable to both acids and bases and are used in areas where slag and atmosphere are either acidic or basic. The common examples of these refractories materials are carbon graphite (most inert), chromite refractories, and alumina refractories.


Which of the following is not a refractory?

1. Which of the following is not refractory sand? Explanation: Among the following, Barium Chloride is not refractory sand, as it is counted under foundry fluxes, whereas all remaining sands are refractory sands.


What is bulk density of refractory?

The bulk density (BD) is the amount of refractory material within a volume (kg/m3). An increase in bulk density of a given refractory increases its volume stability, heat capacity and resistance to slag penetration.


What are the uses of materials?

Materials can be broadly categorized in terms of their use, for example:

  • Building materials are used for construction.
  • Building insulation materials are used to retain heat within buildings.
  • Refractory materials are used for high-temperature applications.
  • Nuclear materials are used for nuclear power and weapons.


Which of the following is not refractory?

1. Which of the following is not refractory sand? Explanation: Among the following, Barium Chloride is not refractory sand, as it is counted under foundry fluxes, whereas all remaining sands are refractory sands.


What is acid refractory?

Acid refractories are those which are not attacked or affected by acidic materials, but easily attacked by alkalis (basic slags). These are used in areas where slag and atmosphere are acidic. Acid refractories include substances such as zirconia (ZrO2), alumina (Al2O3), silica (SiO2) and fire clay brick refractories.


Which property is most important for insulating brick?

The thermal conductivity (l) is significant for efficient operation, therefore bricks with low l-values are preferred. The basic rule is 'The lower the bulk density, the lower the thermal conductivity'.


How many types of refractories are there?

The typical refractory materials include fireclay refractories, high alumina refractories, silica brick, Magnesite refractories, Chromite refractories, Zirconia refractories, Insulating materials and Monolithic refractory.


How the refractory is manufactured?

The formed refractory material is manufactured by firing or chemical bonding methods. The fired refractory material is formed by heating the refractory material to a high temperature in a kiln to form a ceramic bond. This process makes the raw material fire-resistant.


What is refractory manufacturing?

The formed refractory material is manufactured by firing or chemical bonding methods. The fired refractory material is formed by heating the refractory material to a high temperature in a kiln to form a ceramic bond. This process makes the raw material fire-resistant.


Dated : 18-May-2022

Category : Education

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