Which of the following will increase the strength of a sample of 90% SiO2 - 10% MgO
Quench the entire sample in water
Quench half of the sample in water
Cool the entire sample with air jets
Cool half the sample with air
Submerge the sample in a salt bath of Na2O
Submerge the sample in a salt bath of CaO
Quench the entire sample in water
Cool the entire sample with air jets
Submerge the sample in a salt bath of CaO