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Ceramics exam 2 > Silicate-bonded MgO refractories > Flashcards

Silicate-bonded MgO refractories Flashcards

1
Q

How are silicate bonded MgO refractories made?

A

> bricks are PRESSED from DEAD BURNED MgO + sulphate LYE BINDER, fired in a tunnel kiln at 1500-1900C for 3-5 days

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2
Q

What are typical impurities in silicate bonded MgO refractories?

A

> CaO and SiO2
local equilibrias are established between CaO/SiO2 and the MgO clinker

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3
Q

What ratio of CaO/SiO2 impurities facilitates formation of lots of low-temp liquid phase?

A

1:1

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4
Q

What are the applications for silicate bonded MgO refractories?

A

> limited usefulness as a refractory, used in CHECKERWORK in a GLASS TANK REGENERATOR (heat exchanger)

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5
Q

What ratio of CaO/SiO2 impurities results in eutectic liquid forming only at higher temps?

A

2:1

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6
Q

What happens as CaO/SiO2 –> 0?

A

> refractory phases again results

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7
Q

Why must B2O3 impurities be avoided?

A

> it fluxes the Ca2SiO4 phase, and the refractory will float apart at ~1200C

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Ceramics exam 2 (17 decks)

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