Damage to samll rectangular material inside microwave

Well, I have just spoken with a reputable, but now retired, appliance repairman, he advised that this small rectangular cover on the upper interior of the microwave is a MICA Insulator Shield - of which one may be able to purchase just the shield. At this time, I do not know if any appliance parts places have this MICA Insulator Shield available for purchase. But apparently you can purchase a pice just slightly larger and cut the right size for replacement.

If the old one is burnt at all, or has a hole or crack in it - Do Not Use the Microwave.... as it will begin to arc and likely through out the breaker and/or fry the magnatron.

MICROWAVE OVEN FIX

Regarding your microwave's ELECTRON deflector cover being broken.

When your "supposed safe" hard boiled egg device exploded it sent the (it's) cover up through the ELECTRON deflector/scatter cover, which is made of a special material that helps to distribute or scatter the Electron flow energy down to the food target in all directions. This was on all older microwave designs, so I'm guessing your microwave could be as old as 22 years plus?

Older nukers had this scatter fan located directly above that cover to help in this process. Newer designs have all but eliminated them in part, and the newer nukers have the Magnetron mounted on the lower side of the Electronics Bay instead of more on top.

Thus the newer designs have a side plastic cover instead of one being overhead. Easier to clean as well. I believe yours has a scatter fan on top if you look closely you will see it.

Hopefully you didn't damage this part, as then it will need repair as well. You should be able to see the blades moving very slowly while the nuker is running if and when everything is working right. Do you remember seeing this part moving?

You may have damaged the "common wave guide" though, as it's coming off of the Magnetron. Worst case is that you damaged the Magnetron itself.

In which case the electronic sensing circuitry inside the microwave (or 'nuker' as I call them) may have tripped a circuit breaker (if your microwave even has one - but I seriously doubt it), or else it may have blown an internal fuse.

In either case DO NOT USE the unit as it is unsafe as it stands right now.

If you are not going to be repairing the nuker yourself then you have a couple options.

You can call the Mfr for the make & model nuker you have to see if you can get a replacement cover for the unit. They may or may not want to sell you one if it's not going to an authorized factory repair person.

I doubt if your nuker is still under any warranty (possibly might?), but even if it was I seriously doubt a food explosion like that of wish you had would be covered under such warranty. If you had the extended coverage it might, but you would have to read the terms of that extended warranty to see.

Without knowing which make & model you have it's hard to tell what else might be damaged. You may want to include that info here or update your posted ? so people can troubleshoot it in more detail. I've gone as far as I can here.

You do have one of 2 choices though. If it's a cheaper older brand nuker best recommendation is to recycle (junk) it and buy a newer model as the newer models are always improving in quality depending on make - model, and price.

My old manual dial set 500 watt Emerson went 20+ years before the Magnetron went out. Because it had no turntable I threw it out and bought another cheaper Samsung 650 watt with a turntable for under $50. Old one was not worth fixing - parts and labor wise - even though it was my labor.

If yours is a high end priced unit you may want to take it in to an authorized service center if the repair price is not too high. You'll have to make that decision.

Here's a trade cooking secret from me to you that very few people know about. It will replace that old MESSY explosive & expensive method you are using now.

I would highly recommend boiling your eggs in the future by using the method I use every week.

Use a round PYREX 4 quart microwaveable safe dish, and nuke at least 8-10 cold eggs at the same time in cold tap water uncovered for at least 15-20 mins - making sure that they all fit loosely with no overcrowding.

Because my nuker is a rotating type 650 watt unit you will have to experiment with the first batch until you get the cooking time and power setting down-path.

Use the 650 watt setting as a start or find out what that equates to on your nuker. Make sure are all the eggs are covered with water so no shell part is exposed.

Here's the most important part before doing anything!

Before putting those cold eggs into the cold tap water take a clean sharp pin and puncture a centered hole in each end of the egg. Take your time and press gently so as not to crack the shell. I never have busted one egg yet to date - knock on wood.

This a very important part as the egg yoke has to have these 2 ports to expand as it cooks inside. Without them the eggs will all crack miserably. Even with them you might get a couple slightly cracked eggs, but you get the same thing with regular stove top boiling as well. Patience is golden!

Let the eggs stand a few minutes after taking them out, as they will still be final cooking inside after removing them from the nuker. You can run one or two eggs under cold water, and then do a test crack & eat to see how they come out and then adjust the time and power settings accordingly.

When doing more then one batch make sure your PYREX dish is cold again before the 2nd round and so forth, so everything is at or near the same temp before going into the nuker.

Hopefully this info has helped you out, and possibly solved your damaged nuker.

Best regards,

Frank