Glaze and Stain problem after firing

[dream88]

Hello, I have a problem when firing Zirconia. When I apply glaze and stains some times after firring the product comes like white powder. What makes it looks like that?

 

[GG - J]

would seem the stains, and glaze are not being fired and are just setting as if you left them in the oven to dry or set before firing.

do you have any photos?

 

[rkm rdt]

What glaze and stain are you using? What is the firing temp ?

 

[JKraver]

Lets hope this is a human error and not your oven going bad.

 

[dream88]

Well, I fire it again and all looks good. I fire around 880 and stains/glaze is from company baot ceramics. My oven is programmat p510.

 

[Zona]

You arent doing pre heating your closing time is to fast(glaze still have unburnt liquids) on top of that your Zirconiya has not acumulated heat so your glaze cant heat up ..your rising temp is to fast and bazed on all that i guess your cooldown temp is to fast ....
A glaze cicle takes around 1 h for zirconiya ..solution your stand buy tem shall be from 420-500c(depending of glaze you use ..your pre heating time with closing down time shall be around 20 minutes ..long cool down time same around 20 min .. rising temp depends on the case mass ..its from 15-25c cooldown i go 10-20c ..no Vacum for glaze materials if you want high shine , when predraying monitor your Glaze material if you see rapid evaporation of liquid lover the pre heating temperature , your max temp shall not exceed 850c ..preferable mac 800c (otherwise you gonna create problems for yourself) ....dont Rush the times or you gonna spend way more time remaking that bridge