Bubbling in Vita VMK Master opaque! *PICTURES

[edohwin]

http://postimg.org/gallery/1zk44dhqw/270c6e3d/


Getting inconsistent bubbling in different frameworks and copings

I'm using Argen Freedom Plus alloy with VMK master paste opaque and porcelain.

Can't figure out what it is, I'm doing everything the manufacturers are saying!

What could it be?

Thanks in advance, been battling this issue for months. Some good days, some bad days.

 

[sidesh0wb0b]

looks like its coming right off of the metal.
in other words, the bond between the oxide layer and opaque seems fine.....sooooo, metal contamination or not compatible (im not sure about the CTEs

 

[charles007]

Can't speak for metal problems
Looks like opaque blistering /maybe ?

Are you using Paste or powder ?
What is your low temp and dry time ?

 

[edohwin]

Paste opaque
Low temp is 500
We put the pegs on a hotplate to dry them before going into the oven

the contamination must be something that is inconsistent before it isn't always happening.. inconsistency is what is the most frustrating

 

[Mohammad Khair]

check the vacuum of your furnace

 

[Affinity]

Look to your casting techniques...... dont be deceived by porcelain.. I dont think its the issue.. especially if its inconsistent.

 

[2thm8kr]

What are you finishing your metal with? Have you changed finishing tools?
Do you do all the opaquing?

 

[rkm rdt]

Are you using carbides or stones to finish your metal?

What is the entry level temperature of your furnace?

 

[2thm8kr]

Are you using carbides or stones to finish your metal?

What is the entry level temperature of your furnace?

He said that he was drying on a hot plate, which was making me lean toward the finishing tools or maybe an incompatible liquid with the paste opaques.??

 

[edohwin]

Using carbide
No I don't opaque myself but I'm watching them closely

I use the opaque paste liquid that is supplied with the opaques.

It is an old vacuum may I should upgrade it

 

[rkm rdt]

I think it's your carbides.
Try using a new white aluminum oxide stone to finish your metal.

I use a heatless stone followed by a pink coarse stone and then the white .

I had the same problem when I used carbides.

 

[2thm8kr]

Using carbide
No I don't opaque myself but I'm watching them closely

I use the opaque paste liquid that is supplied with the opaques.

It is an old vacuum may I should upgrade it

If the layered ceramic looks good, its probably not the vacuum.
Have you tried opaque a coping or two yourself and see what happens?

 

[Mohammad Khair]

Using carbide
No I don't opaque myself but I'm watching them closely

I use the opaque paste liquid that is supplied with the opaques.

It is an old vacuum may I should upgrade it

how old the vacuum is ? and what furnace is that?

what i meant by vacuum is the vacuum system not only the pump.
it could be the silicon seal, the hose, or the pump.

 

[edohwin]

But if it's the carbide wouldn't all the days of opaque be bad? It's hard to tell techs who have used carbide for decades to switch haha. Also I have opaqued the ones that bubbled and still no dice.

Yeah ceramics ok and no vacuum error so maybe it's not vacuum

 

[sidesh0wb0b]

I think it's your carbides.
Try using a new white aluminum oxide stone to finish your metal.

I use a heatless stone followed by a pink coarse stone and then the white .

I had the same problem when I used carbides.

I've never in 10 years of using carbides heard of this coming from carbides. that's the reason for using them vs stones.

 

[2thm8kr]

I think it's your carbides.
Try using a new white aluminum oxide stone to finish your metal.

I use a heatless stone followed by a pink coarse stone and then the white .

I had the same problem when I used carbides.

You're going to get the carbide users up it arms. Lol
I used sintered diamonds after having problems like this with carbides and factory contaminated batches of stones. Nearly drove me to insanity, though short trip it may have been.

 

[2thm8kr]

But if it's the carbide wouldn't all the days of opaque be bad? It's hard to tell techs who have used carbide for decades to switch haha. Also I have opaqued the ones that bubbled and still no dice.

Yeah ceramics ok and no vacuum error so maybe it's not vacuum

Ever been in a hurry doing several things at once at cleaned your opaque brush in the water dish. That's what photo5 reminds me of.

 

[rkm rdt]

Carbides are good for high content gold alloys because they sheer the soft metal. Stones will create voids/rolls which trap air.

Stones are better on semi precious and base alloys.

 

[rkm rdt]

I don't degass my alloys either. cast,trim,sandblast and opaque.
No hotplate but a 450 degree entry after a 5 min dry. slow climb.

 

[rkm rdt]

Dump your hotplate.

The ceramists are paid by the unit aren't they.