Question:
Black core defect in whiteware occurs due to
Black core defect in whiteware occurs due to
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Black core defect occurs when carbonaceous material is trapped inside the ceramic body due to incomplete oxidation during firing.
Updated On: May 7, 2026
- Excess Silica
- Trapped carbon
- Over vitrification
- Rapid cooling
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The Correct Option is B
Solution and Explanation
Concept:
Black core is a firing defect in ceramic bodies. It occurs when carbonaceous matter inside the ceramic body is not completely burnt out during firing.
Step 1: Ceramic raw materials may contain organic impurities or carbonaceous matter.
Step 2: During firing, these carbon-containing materials should burn out properly.
Step 3: If firing is too fast or oxygen supply is insufficient, carbon does not burn completely.
Step 4: The unburnt or trapped carbon remains inside the body.
Step 5: This produces a dark or black region inside the ceramic body, known as black core defect. Therefore, black core defect occurs due to: \[ \boxed{\text{Trapped carbon}} \]
Step 1: Ceramic raw materials may contain organic impurities or carbonaceous matter.
Step 2: During firing, these carbon-containing materials should burn out properly.
Step 3: If firing is too fast or oxygen supply is insufficient, carbon does not burn completely.
Step 4: The unburnt or trapped carbon remains inside the body.
Step 5: This produces a dark or black region inside the ceramic body, known as black core defect. Therefore, black core defect occurs due to: \[ \boxed{\text{Trapped carbon}} \]
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