The disadvantages of hot pressing include:
1. Long heat transfer time: Hot pressing requires a long time for the heat to transfer from the surface to the core of the material, especially when the composite is thick.
2. Size limitation: The obtained target size is small due to the limitation of the hot pressing equipment and the size of the mold. The current maximum size of the target is 400 × 300mm.
3. High requirements on mold materials: Hot pressing method has high requirements on mold materials, generally requiring high-purity high-strength graphite. This increases the cost and limits the availability of suitable molds.
4. Not suitable for industrial continuous production: Hot pressing equipment needs to be imported and is not suitable for industrial continuous production. This leads to low production efficiency and high cost.
5. Poor uniformity of target grain: The uniformity of the target grain produced by hot pressing is often poor.
6. Heating temperature distribution not uniform: The heating temperature distribution in hot pressing is not always uniform, which can affect the quality of the final product.
7. High investment cost: Hot pressing equipment can be expensive, leading to high investment costs.
8. Low production efficiency: Hot pressing has low production efficiency, making it less competitive compared to other methods.
9. Limited size of the target: The size of the target is limited by the pressure of the equipment and the size of the cylinder, making it difficult to prepare large-sized targets.
10. Inhibits grain growth: Hot isostatic pressing, a type of hot pressing, can avoid grain growth, but it has the disadvantage of low production efficiency and high production cost.
11. Low productivity and high cost: Hot pressing sintering has low productivity and high cost compared to other sintering methods.
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