Refractories and Refractory Products - Glossaries for terms starting with alphabet P

Refractory lining Job | Refractories | Refractory Raw materials

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Peeling

The loss of a part of from the surface of a refractory material as a consequence of cracking behind the hot face.  

Peep hole (Spy hole)

A hole made in the Refractory for the purpose of observation.

Periclase

Crystalline magnesium oxide, MgO.

Picrochromite

Magnesium chrome spinel.

Pinion wall / Pip

Non-refractory end wall of a battery. Refractory bottom with a point on its upper surface. 

Pitch bonded basic brick

Unburned refractory bricks (shapes) bonded with pitch. If subsequently heat-treated sufficiently to minimize softening of the bond on reheating, they are referred to as tempered.   

Pitch impregnated basic brick

Burned basic refractory bricks impregnated with pitch after firing.

Plastic refractory

(1) A refractory composition (mix) that can be readily used and may contain some additive (sintering aid) to ensure sintering at a relatively low temperature. (2) A refractory mix of ground fireclay materials in plastic form that can be suitably rammed into a place to form a monolithic lining.

Plasticity

The property of a material, especially clay that allows it to be shaped without cracking and to retain its new form.

Port

These are furnace openings through which liquid or gaseous fuel and/or air for combustion is introduced.

Pot

A vessel which may be either open or closed, used for melting glass.

Pot arch

A furnace for pre-heating pots.    

Pyrometric cone equivalent (PCE)

The number of the standard pyrometric cone that bends at the temperature at which the test cone bends (or the numbers of the standard cones that bend immediately before or after that temperature) under the standardized conditions of the refractoriness test.  

Permanent linear change on reheating (PLC)

The per cent dimensional change in length (based on original length) of a refractory specimen free from any externally applied stress, after being subjected to a specified temperature for a specified period of time.  

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Glossary of Refractory Terms starting with alphabet - O

Refractory (technology) Terms

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Orifice ring

Annular piece of refractories of accurate size fitted below the feeder spout, through which the glass flows.

Oven sole

Refractory brickwork on which the coal charge rests.     

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Glossary of Refractories and Refractory related terms starting with alphabet - N

Refractories and Refractory Technology

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Needle or Plunger

The vertical part of a feeder which alternatively forces the glass through the orifice and pulls it up after shearing.

Neutral refractories

Refractories that is resistant to chemical attack by both acid and basic slags, refractories and fluxes even at high temperatures.   

Nose or Mouth

Upper opening of a converter through the gases escape, charging is done and deslagging and pouring are effected.  

Nozzle

A hollow refractory of circular / pipe shape containing an orifice through which molten materials or hot gases are transmitted.

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Glossary of Refractory Terms starting with alphabet - M

Refractory technology | Refractory Lining Job

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Magnesite

An important component of basic refractories usually obtained by calcining magnesium carbonate, also from Sea Water.

Matrix

The medium or base material in which crystals are embedded.  

Melting point

The temperature at which the crystalline and liquid phases having the same composition coexist in equilibrium. Metals and pure crystalline materials have sharp melting points. But most refractories have no true melting points rather they melt progressively over a wide range of temperatures.

Mineralizer

Substance present in or added in small quantities to a batch in order to expedite the formation, during subsequent firing, of certain compounds or phases etc.   

Monolithic

Term applied to refractory lining or brick which are joint less and are formed by in situ casting or ramming to make an integral structure.

Mullite

The main component of acid refractories, highly refractory alumino-silicate, not found in nature except in traces, but obtained from firing fire clays and various sillimanite group of minerals like - sillimanite, andalusite, kyanite, etc.

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Refractory related glossaries for terms starting with alphabet L

Refractory (technology) Terms

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Ladle

A refractory-lined metal vessel used to hold and transport molten product (metal).  

Ladle brick

Refractory bricks including fireclay bricks, suitable for lining Ladles used to contain molten metal. 

Lamination

Directional faults in texture that may be formed during the shaping of clayware or other refractories.  

Launder or Lander

A refractory lined open channel along which molten steel or other molten material flows from the furnace.

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Glossary of Refractory Terms starting with alphabet - K

Refractory Terms and Definitions

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Key

In furnace construction the uppermost or the closing refractory brick of a curved arch.

Key brick

See Bullhead.

Kiln

A device or enclosure to provide thermal processing of an article or substance in a controlled temperature environment or atmosphere, often by direct firing, but occasionally by convection or radiation heat transfer. Kilns are used in many different industries, and the type of device called a kiln varies with the industry. When melting is involved as in steel manufacture, the term furnace is used, as in blast furnace and basic oxygen furnace.

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