Aluminium foil will darken in contact with heat and moisture but shouldn't catch fire in your oven.
I think your question is "Does foil catch fire in oven when on cleaning mode?" If so, Foil catches fire if it is contaminated with grease/oil type. It does not have flammability.
Aluminum foil is a metal and it will conduct electricity. In general, the foil will reflect microwave energy, but if the foil has a certain shape, it will cause the metal to act as an antenna. Voltages will be generated (induced) in the foil, and those voltages can rise to thousands of volts causing an electric arc. This arc is very hot and can ignite other things in the cavity (the cooking space) in the oven. The aluminum isn't likely to catch fire, but food and plastic containers sure can. It is generally a good idea to avoid using foil in the microwave oven, but there are some circumstances where it can be used safely. You'll find information in the owner's manual.
99.99% unlikely.
Aluminium foil disintegrates in a convection oven because the heat rays of the oven hits the aluminium foil but gets reflected by the foil. Thus, the oven over heats and the aluminium foil disintegrates.
Yes, in a normal oven it will catch crumbs, grease, oil etc. But DON'T put it in a microwave oven, or any other metal for that matter.
We put tin foil in our oven at the very bottom. I honestly cant tell you why but apparently it does something to help. It doesn't even catch on fire if that was what you were wondering as well.
A solar oven is made up of aluminum panels and won't catch on fire itself. However, it is possible for the food being cooked within the solar oven to catch on fire much like a magnifying glass focusing light from the sun can catch a leaf on fire.
You want to clean the oven, particularly if you have spills so that they do not catch fire next time you light it up to cook.
If baking in an oven, the foil can be used or not. If baking on a camp fire of fire place I say use the foil as it is in direct contact with the heat source. Or you may just rinse the sweet potato and bake in in the microwave after poking a few holes in it with a fork.
No!
There is a possibility, depending on strength, size, if they will catch fire in the oven, etc.
Naval Jelly! Go here: http://www.howtocleanstuff.net/how-to-remove-melted-aluminum-foil-from-the-oven/