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Samenvatting glas en email
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Samenvatting van 7 pagina's voor het vak Materiaal en technieken aan de KU Leuven (samenvatting)
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GLAS & EMAILGrondstoffen
Glas
stollingsgesteente
obsidiaan
bergkristal
o een in de natuurvoorkomende grondstof
o niet geschikt om glas v te maken -> wel slijpen en graveren
basisstof + vloeimiddel + stabilisator + zuiveringsmiddel
Basisstof
silicium (= (kiezel)zand of kwarts)
Vloeimiddel (zout)
soda/ natriumcarbonaat
o uit de as v algen of uit zeewier
o daling vh SP tot 1200 °C
potas/ kaliumcarbonaat
o dr verbranding v varens of beukenhout
o gebruikt vr het maken v woudglas
borax/ natriumzout
Stabilisator
calcium
loodoxide (betere schittering & stevigheid)
magnesium
Zuiveringsmiddel (tegen luchtbellen)
arsenicumoxide
salpeter
Courante glassoorten
glas
o natronkalkglas, natronglas, sodaglas
o basisstof: silicium
kristal
o kristalglas, kaliumkalkglas, Boheems kristal
o vloeimiddel: potas
Gebruiks- & sierglas
Productietechnieken
glasoven: 3 verdiepingen
o onderaan: stookoven (brandstof)
o midden: frit
o bovenaan: koeloven
proces:
o verschillende componenten samen in een glasoven verhit (smeltmassa)
o glasmassa laten afkoelen (frit)
o frit verpulveren en toevoegen ae nieuwe smeltmassa (om ST te verlagen)
o gesmolten massa = paraison
verschillende technieken
o glasblazen
proces:
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