The main cause of stones in the furnace of high borosilicate glass
Release time:
2024-10-09 00:00
Source:
There will be inclusions such as bubbles, nodules, crystals, and stones in the vitreous. These defects in the vitreous body greatly reduce the quality of the glass. In the case of borosilicate glass, stones are a dangerous defect in the vitreous. They are crystalline solid inclusions that appear in the glass and they have a great influence on the glass. They are more likely to be caused when borosilicate glass fiber precursors are stretched. Brushed guils and flying wires. Even if these stones do not cause breakage, they will greatly reduce the strength of the fiberglass.
The main causes of stones in high borosilicate glass electrofusion cellars are as follows:
(1) Raw material stones are mainly caused by the high concentration of mineral raw materials and insufficient contact with molten glass caused by uneven mixing of batch materials. The incompletely melted particles flow out along with the molten glass, forming granular or flocculent stones.
(2) Stones introduced by clinker, clinker from borosilicate glass electrofusion cellars from defective balls, clinker from pelletizing, and glass blocks from dismantled kilns. Defective balls and frit blocks in the kiln are usually clean and do not cause stones. The clinker produced by pelletizing inevitably mixes with other impurities, so some knots are produced.
(3) Refractory stones, refractory materials interact with borosilicate glass or volatile products for a long time, and are corroded and enter the borosilicate glass liquid to produce stones. In high borosilicate glass electrofusion cellars, this is mainly caused by the corrosion of quartz bricks. When the quartz brick is corroded by high-temperature borosilicate glass, the quartz brick will become cristobalite and become metastable cristobalite, and a large number of scaly cracks will appear. When metastable cristobalite is corroded by glass, the large particles gradually break down into small particles that enter the molten glass and form stones, which are mostly opaque white.
(4) Crystalline stone is mainly caused by the existence of "dead ends" in the kiln, and the temperature of dead ends is within the range of crystallization growth temperature for a long time.
(5) The heating of the exotic impurity stone, high borosilicate glass electrofusion cellar is heated by carbon rods. When the carbon rod breaks due to arc discharge, the resulting carbon rod slag will enter the molten glass, resulting in the appearance of black stones in the product. In addition, molybdenum electrodes are used in high-borosilicate glass electric melting furnaces. When the liquid level of the glass is low, the molybdenum will oxidize at high temperatures, and black stones will also appear. The number of stones caused by these two phenomena is also relatively small, but if an abnormality occurs, a large number of stones will continue to be produced.
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The main cause of stones in the furnace of high borosilicate glass
There will be inclusions such as bubbles, nodules, crystals, and stones in the vitreous. These defects in the vitreous body greatly reduce the quality of the glass. In the case of borosilicate glass, stones are a dangerous defect in the vitreous. They are crystalline solid inclusions that appear in the glass and they have a great influence on the glass. They are more likely to be caused when borosilicate glass fiber precursors are stretched. Brushed guils and flying wires. Even if these stones do not cause breakage, they will greatly reduce the strength of the fiberglass.