Why A Silica Powder Is Melting But Not Burnt When Heated?


by mymachine
Tags: burnt, heated, melting, powder, silica
mymachine
mymachine is offline
#1
May23-13, 12:26 AM
P: 42
Why a silica powder is melting but not burnt when heated?

Thank you
Phys.Org News Partner Engineering news on Phys.org
Fiber-optic microscope will help physicians detect cancer, diseases at early stages
Wind tunnel tests support improved aerodynamic design of B61-12 bomb
Smart sensor technology to combat indoor air pollution
mfb
mfb is offline
#2
May23-13, 06:43 AM
Mentor
P: 10,767
Silica (silicon dioxide) is "burnt" silicon. You cannot burn it for the same reason you cannot burn carbon dioxide.
mymachine
mymachine is offline
#3
May23-13, 03:44 PM
P: 42
Quote Quote by mfb View Post
Silica (silicon dioxide) is "burnt" silicon. You cannot burn it for the same reason you cannot burn carbon dioxide.
What I meant as a burnt is such as the below image:

burnt bread

mfb
mfb is offline
#4
May23-13, 04:52 PM
Mentor
P: 10,767

Why A Silica Powder Is Melting But Not Burnt When Heated?


That is probably the result of a reaction between bread and oxygen.
Silica is the result of a reaction between silicon and oxygen. It does not look black, but it is similar to a burnt bread.
Borek
Borek is offline
#5
May23-13, 05:12 PM
Admin
Borek's Avatar
P: 22,656
Actually burnt bread is more like effect of the carbohydrates decomposition - water leaves molecules, leaving mostly pure carbon. Silica is not similar to carbohydrates.


Register to reply

Related Discussions
What would happen if pressable ceramic is heated past melting range? Materials & Chemical Engineering 1
Burnt up Classical Physics 24
Question about silica Chemistry 2
Burnt out? Academic Guidance 8
Protein Powder and Beef Powder General Discussion 6