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Enamel chipping-off and fish-scale are common defects of enamel products, which refer to the internal and external stress on the porcelain surface after the enamel products are fired. If the enamel finished product is de-ceramic, you can start to analyze it from the following reasons.
(1) De-Porcelain: The enamel falls off
Cause Analysis:
- Devitrification due to severe cracks; 2. The ground coat is too thin on the sides, handles, feet, and bottom, and the firing temperature is high; 3. The cover coat is too thick and the firing is insufficient.
Solution:
- Appropriately increase the curvature radius of the side, handle, foot and bottom; 2. Adjust the bulk density of the enamel slurry to avoid local coating too thin or too thick.
(2) Fish scale: The porcelain surface is scaly and loses the porcelain (some appear after firing, and some appear in a week or more)
Reason analysis: 1. The content of C.S.P.Si in the thin steel plate is high; 2. The acid concentration is high, and the pickling time is long; 3. The clay is of poor quality and there are many impurities; 4. The furnace temperature is high, and the ground coat is partially scorched.
Solution: 1. Choose a high-quality steel plate suitable for enamel; 2. The acid concentration should not be too high. The pickling time should be appropriate; 3. Choose high-quality clay; 4. Use hard and soft mixed primer. Grind and add about 10% calcined quartz, and the ground coat firing furnace temperature should not be too high to avoid local scorching.
What else can I help you with?
When was FishScale created?
FishScale was created in 2006.
What is the main role of borax, urea, sodium nitrite, etc?
Most of the enamel additives used for enamel slurry mixing are electrolytes that are easily soluble in water, and are used as saturated solutions. Today we will introduce the role of common enamel additives such as borax, urea, sodium nitrite, and magnesium sulfate in the enamel slurry, which is convenient for enamel factories to apply in the actual operation process. Magnesium Sulfate (MgSO4•7H2O): Retaining agent for ground coat, titanium enamel and color enamel. Excessive amount will reduce the staying effect, and will cause the porcelain surface to be rough and reduce the adhesion. Barium chloride (BaCl2•2H2O): The retention agent of antimony enamel, titanium enamel and colored enamel, it is difficult to handle if the excessive consistency is large, but it is forbidden to use bright red and cadmium yellow. Potassium carbonate (K2CO3): Titanium enamel retention agent, excessive amount will cause piping watermarks, yellowing, and serious boiling. Sodium carbonate (Na2CO3): Solve the pitting of the ground coat layer, the bullet points and small black spots of the surface enamel layer, and excessive amount will cause the enamel slurry to stay poorly. Potassium Chloride (KCL): A retention agent for titanium enamel, excessive amount will cause piping watermarks, yellowing, and serious boiling. Sodium Chloride (NaCl): Used for surface enamel, it can increase the strength of powder blank, and excessive amount will affect the gloss of porcelain surface. Borax (Na2B4O7•10H2O): Solve the pitting defect of the ground coat layer, and excessive amount will easily cause boiling or shrinkage. Urea (NH) 2CO: Increase the strength of the enamel powder blank, and solve the defects such as powder lines, black lines of piping watermarks, and black spots. Excessive amount will reduce the physical and chemical properties of enamel products (gloss, acid resistance, heat resistance, impact resistance) and cause boiling defects, so red enamel paste should not be used. Sodium nitrite (NaNO2): Solve the yellow rust spots caused by poor drying of the ground coat powder. Excessive amount can easily cause piping watermarks, blistering or boiling. Potassium chlorate (KClO3): Solve the boiling point of the titanium enamel layer. Excessive amount will reduce the luster and cause the edge watermark to boil. The enamel products with red edge enamel should be added less to avoid darkening the edge enamel color. Sodium chlorate (NaClO3): The effect is the same as that of potassium chlorate.
Too much fluoride can result in?
fluoride toxicity, enamel hypoplasia, fluorosis, and mottled enamel
What do you call the white covering of the tooth?
It is called the enamel. It's the most external layer of a tooth and the hardest substance in the body.
The outside of your tooth is called enamel?
it is called enamel. so the answer is true It is called enamel
What element is needed for strong enamel?
Tooth enamel, calcium. Nail enamel, Biotin.
Do dogs have an enamel?
The thickness of the enamel of dogs was measured in the teeth of the animal. The enamel was found to be thinner than that of human teeth, varying in thickness from 0.1mm-1mm. The "enamel bulge" coronal to the cemento-enamel junction does not consist of a thickened area of enamel.
Is enamel stronger or hair?
Enamel is stronger than hair. Enamel is the hardest substance in the human body, providing protection to the teeth from wear and decay. Hair is made of keratin, a protein that is not as hard as enamel.
How do you say enamel in french?
enamel is called émail in French.
Is tooth enamel and paint enamel the same?
yes
Hypocalcified structures of dentin?
Enamel tufts Enamel spindles Enamel lamellae Striae of Retzius Neonatal lines
What is the difference between enamel lamella and crack?
Enamel lamellae are defects in tooth enamel that result from incomplete mineralization, while cracks in enamel are actual fractures in the enamel surface that can extend into deeper layers. Enamel lamellae are usually superficial and do not necessarily compromise the structural integrity of the tooth, whereas cracks can weaken the enamel and potentially lead to tooth sensitivity or decay.
