Glass ceramics, also known as glass-ceramics, are a composite of a combination of crystalline phase and glass that has been produced by high temperature melting, forming, and heat treatment. It has excellent mechanical strength, thermal expansion performance, thermal shock resistance, chemical resistance, low dielectric loss and other superior properties.Glass ceramics are widely used in machinery manufacturing, optics, electronics and microelectronics, aerospace, chemical, industrial, biomedical and construction. Due to the complicated manufacturing process and high technical requirements of the glass ceramic panel, the high-quality glass ceramic production process and control technology are basically monopolized by foreign countries. Therefore, the domestic glass ceramic production process has problems of poor quality and low yield. Macor Ceramics,Machinable Glass Ceramics,Glass Ceramic Round Disc,Machinable Glass Ceramic Tube,Glass Alumina Ceramic Block Dongguan Haikun New Material Co., Ltd. , https://www.hkceram.com
The Quality of Silicon Carbide Abrasives and the Impact of Impurities
Silicon carbide abrasives are widely used due to their excellent hardness and thermal conductivity. Typically, the higher the purity of silicon carbide, the better the performance of the abrasive. However, in the artificial synthesis process, achieving absolute purity is challenging because various impurities inevitably find their way into the product. These impurities have varying effects on the properties and quality of silicon carbide abrasives. Below is an analysis of the impact of several common impurities:
1. **Fe₂O₃ (Iron Oxide)**
During the smelting process, a controlled amount of iron oxide can help improve the crystallization of silicon carbide and boost the yield from individual furnaces. Nevertheless, excessive iron oxide can negatively affect the final product's yield and lead to issues like discoloration or rusting in the abrasive materials. This is particularly noticeable when abrasives made from silicon carbide containing high levels of iron oxide exhibit reddish hues and are prone to rusting during use.
2. **Al₂O₃ (Alumina)**
A small quantity of alumina can enhance the overall yield of silicon carbide during production. However, it has adverse effects on the crystal structure, often resulting in smaller or less uniform crystal sizes. Additionally, alumina can influence the color of the finished product, causing deviations from the desired hue. Therefore, minimizing the presence of alumina is generally recommended to maintain the desired aesthetic and functional qualities.
3. **CaO (Calcium Oxide)**
Calcium oxide reacts with quartz sand in the raw materials to create compounds with low melting points and increased fluidity. This reaction impedes the reduction of silica and slows down the formation of silicon carbide, thereby reducing the overall reaction rate. Furthermore, the presence of calcium oxide can lead to discoloration of the silicon carbide crystals, often turning them black, which affects the visual and structural integrity of the final product.
4. **MgO (Magnesium Oxide)**
Similar to calcium oxide, magnesium oxide impurities can slow down the formation of silicon carbide and contribute to the darkening of the crystals. This impurity not only impacts the physical appearance of the material but also reduces the overall efficiency of the manufacturing process.
In conclusion, while achieving high purity remains a primary goal in silicon carbide production, understanding and managing the effects of these impurities is crucial for optimizing the quality and performance of silicon carbide abrasives. Manufacturers must carefully control the levels of impurities during the production phase to ensure the abrasives meet industry standards and customer expectations.
Source: hxmlsic Diancom
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*Note: This analysis is based on current industry knowledge and may vary depending on specific production techniques and conditions.*