جيفينج سيراميك
طبقة سيراميك من كربيد السيليكون: The Ultimate Solution for High-Temperature Industrial Applications
1. Core Advantages from Inherent Material Properties
First and foremost, silicon carbide ceramic shims derive core advantages from their inherent material properties. بشكل ملحوظ, silicon carbide is a compound with strong covalent bonds, and its Si-C bond has only about 12% ionicity. Consequently, this unique molecular structure grants the material superior mechanical performance, excellent oxidation resistance, and a low friction coefficient.
2. Exceptional High-Temperature Performance
In particular, exceptional high-temperature performance stands out as a key feature of these shims. Conventional ceramics tend to lose strength sharply at 1200–1400°C; however, this is not the case for silicon carbide. Instead, it retains high flexural strength (500–600 MPa) even at 1400°C. Furthermore, its operating temperature spans 1600 to 1700°C, thereby making it ideal for high-temperature applications such as aerospace engine combustion chambers and heat treatment equipment.
3. Outstanding Thermal Properties
In terms of thermal performance, silicon carbide ceramics exhibit outstanding characteristics. Specifically, they boast high thermal conductivity—second only to beryllium oxide among ceramic materials. Additionally, a low coefficient of thermal expansion further enhances their overall performance. Therefore, this combination ensures excellent thermal shock resistance, letting the shims maintain structural integrity and functional stability amid rapid temperature fluctuations.
4. Superior Wear and Corrosion Resistance
Beyond thermal and high-temperature advantages, wear and corrosion resistance are major strengths of these shims. Specifically, they are defined by high hardness, excellent wear resistance, and a low friction coefficient. In turn, these traits collectively deliver a long service life, even under high-speed and high-load conditions. Moreover, their resistance to most acidic and alkaline media also makes them suitable for harsh chemical industry environments.
5. Key Manufacturing Technique: Reaction Bonding
From a manufacturing standpoint, reaction bonding is a key technique for producing these shims. Specifically, this process relies on low-temperature sintering with a short cycle, which enables the production of large, complex-shaped ceramic components. At the same time, it ensures dimensional stability. Thus, such advantages make reaction bonding ideal for shims that require precise dimensional tolerances.
6. Wide Industrial Applications
Across various industries, these shims find wide application. In the aerospace sector, for instance, they are used to manufacture high-temperature components like combustion chambers. Additionally, in the energy and chemical sectors, they are employed as pipe linings, nozzles, and flow control chokes. Similarly, for the semiconductor industry, they serve as critical components in high-temperature manufacturing equipment.
7. Limitations and Improvement Solutions
While silicon carbide ceramics offer numerous advantages, low fracture toughness is a main limitation. Specifically, this flaw causes inherent brittleness. To address this issue, researchers have therefore developed silicon carbide-based composite ceramics. Typical examples include fiber (or whisker)-reinforced systems and heterogeneous particle-dispersed systems, which greatly boost the toughness and strength of the monolithic material.
8. Future Outlook
Looking ahead, as preparation technologies continue to advance, the performance of silicon carbide ceramic shims will be further optimized. Correspondingly, their application scope will also expand, ultimately making them increasingly indispensable in extreme environments involving high temperatures, corrosion, and wear.
