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1、La_2O_3和WSi_2增强MoSi_2基复合材料的摩擦磨损性能研究摘要：本文研究了La2O3和WSi2对MoSi2基复合材料摩擦磨损性能的影响。利用真空感应熔炼、热等静压和热处理工艺制备了不同添加量La2O3和WSi2的MoSi2基复合材料，并进行了摩擦磨损实验。结果表明，适量添加La2O3和WSi2可以显著提高MoSi2基复合材料摩擦磨损性能。当La2O3添加量为4，WSi2添加量为10时，MoSi2基复合材料的耐磨性能最佳，摩擦系数最小。关键词：La2O3；WSi2；MoSi2；复合材料；摩擦磨损性能Introduction:MoSi2 has good high temperatur
2、e mechanical properties, oxidation and corrosion resistance, and is widely used in aerospace, nuclear energy and other fields. However, its poor wear resistance limits its wider application. Therefore, it is necessary to improve the wear resistance of MoSi2.In recent years, the addition of reinforce
3、ments into the matrix has become an effective way to improve the properties of materials, and composite materials have been widely used. La2O3 and WSi2 are excellent ceramic materials, which can improve the thermal stability and wear resistance of materials by adding them into the matrix.In this stu
4、dy, MoSi2-based composite materials with different amounts of La2O3 and WSi2 were prepared by vacuum induction melting, hot isostatic pressing and heat treatment. The effects of La2O3 and WSi2 on the friction and wear properties of MoSi2-based composite materials were studied.Experimental methods:Mo
5、Si2-based composite materials were prepared using vacuum induction melting, hot isostatic pressing and heat treatment. The content of La2O3 and WSi2 in the composite materials was 0%, 2%, 4%, 6%, 8%, and 10% by mass fraction. The density and microstructure of the materials were observed by optical m
6、icroscopy and SEM. The friction and wear properties of the materials were evaluated by ring-on-disk friction tester.Results and discussion:The density of the MoSi2-based composite materials gradually increased with the increase of the content of La2O3 and WSi2. The addition of La2O3 and WSi2 changed
7、 the grain size of MoSi2-based composite materials, and the grain size decreased with the increase of the content of La2O3 and WSi2.The friction coefficient of the MoSi2-based composite materials decreased with the increase of the content of La2O3 and WSi2. When the content of La2O3 was 4%, and the
8、content of WSi2 was 10%, the friction coefficient was the lowest. It was found that the addition of La2O3 and WSi2 could reduce the friction coefficient of the material, which may be due to the formation of a protective film on the surface of the material during the friction process, which reduces t
9、he friction and wear.The wear rate of the MoSi2-based composite materials also decreased with the increase of the content of La2O3 and WSi2. The wear mechanism of the material was mainly adhesive wear and abrasive wear. With the increase of the content of La2O3 and WSi2, the wear mechanism was gradu
10、ally transformed from adhesive wear to abrasive wear. This is due to the fact that the hardness and strength of the materials increased after adding La2O3 and WSi2.Conclusion:In summary, the addition of La2O3 and WSi2 can significantly improve the friction and wear properties of MoSi2-based composit
11、e materials. When the content of La2O3 was 4%, and the content of WSi2 was 10%, the friction coefficient was the lowest, and the wear resistance was the best. The improvement of the friction and wear properties of the material may be due to the formation of a protective film on the surface of the ma
12、terial during the friction process, which reduces the friction and wear.Furthermore, the addition of La2O3 and WSi2 into the MoSi2 matrix led to a refinement of the microstructure and an increase in the materials density. The grain size of the composite material decreased with increasing La2O3 and W
13、Si2 content, which contributes to the improvement of the wear resistance by hindering the crack propagation and decreasing the defects within the material. The wear resistance of the MoSi2-based composite materials showed a significant improvement as La2O3 and WSi2 content was increased. The decreas
14、e in wear rate can be attributed to the formation of ceramic-based protective layers on the surfaces of the composite material during the wear process, which improved the materials resistance to wear. Moreover, the abrasive wear mechanism gradually becomes preferable as the content of La2O3 and WSi2
15、 increases, which can be explained by the fact that La2O3 and WSi2 possess high hardness and wear resistance.In conclusion, the results of this study demonstrate that the addition of La2O3 and WSi2 into the MoSi2 matrix significantly improves the friction and wear properties of the composite materia
16、l. The optimum content of La2O3 and WSi2 was found to be 4% and 10%, respectively, leading to an improvement in both the tribological and mechanical properties of the composite material. This research provides a potential solution for the enhancement of the wear resistance of MoSi2-based materials,
17、and paves the way for their potential use in high-temperature applications.Furthermore, the effect of the addition of La2O3 and WSi2 on the mechanical properties of the MoSi2-based composite materials was also investigated. The addition of these two elements resulted in an increase in the hardness,
18、compressive strength, and fracture toughness of the material. This can be attributed to the formation of a solid solution between MoSi2 and the added elements, as well as the refinement of the microstructure that resulted in a more homogenous distribution of the reinforcing particles.The improvement
19、 in the mechanical and tribological properties of the MoSi2-based composite material is of significant importance for the development of materials that can perform well in high-temperature and harsh environments. These environments include aerospace, power generation, and nuclear industries, where h
20、igh-performance materials are in great demand. The enhanced properties of the MoSi2-based composite material can contribute to the development of new materials capable of withstanding high temperatures, reducing maintenance costs, and increasing the operating efficiency of these industries.In additi
21、on, the investigation of the wear mechanisms of the MoSi2-based composite materials during the friction and wear tests provided valuable insights into the underlying physical and chemical processes that occur during wear. The results suggested that the formation of a ceramic-based protective layer d
22、uring wear played a critical role in enhancing the wear resistance of the composite material. The increase in hardness and wear resistance of the material can be attributed to the high thermal stability and good oxidation resistance of La2O3 and WSi2, both of which can enhance the materials resistan
23、ce to wear.In conclusion, the addition of La2O3 and WSi2 offers a promising solution for improving the mechanical and tribological properties of MoSi2-based materials. The enhanced properties of the composite material make it a viable candidate for use in high-temperature and harsh environments, pro
24、viding the industry with a potential solution for the development of high-performance materials.The incorporation of La2O3 and WSi2 has been shown to have other beneficial effects on the MoSi2-based composite material. For instance, it has been reported that the addition of La2O3 can reduce the susc
25、eptibility of MoSi2 to oxidation by promoting the formation of a protective oxide scale on the surface of the material. This property makes the material well-suited for high-temperature applications where oxidation resistance is crucial. Additionally, WSi2 has high thermal and mechanical stability,
26、which contributes to the improved properties of the composite material, ultimately leading to its increased wear resistance.The application of MoSi2-based composite materials is not only limited to the aerospace, power generation, and nuclear industries, as they have also shown potential uses in the
27、 automotive, chemical processing, and mechanical engineering fields. For example, in the automotive industry, the development of lightweight and durable materials is particularly essential for the manufacturing of engines and exhaust systems. MoSi2-based composites can offer a solution for such appl
28、ications, with their high-temperature resistance and wear resistance capabilities, as well as their overall mechanical properties that make them superior over traditional materials such as steel and aluminum.Finally, the optimization of the manufacturing process for MoSi2-based composite materials i
29、s crucial to ensure their widespread use in different industries. It is essential to have a controlled and reproducible method of manufacturing the composites, and numerous methods have been proposed and investigated, such as powder metallurgy, spark plasma sintering, and hot pressing. Fine-tuning t
30、he manufacturing process can lead to further improvements in the mechanical and tribological properties of the material, making it an even more viable option for various high-temperature and harsh environment applications.In conclusion, the results of research on MoSi2-based composite materials inco
31、rporating La2O3 and WSi2 have shown the significant potential of these materials for numerous industrial uses. The superior mechanical and tribological properties of these composite materials make them a leading candidate for application in high-temperature and harsh environments. The incorporation
32、of these materials can provide a solution for the development of high-performance materials in multiple fields, with further optimization of the manufacturing process promising further improvements.Another promising characteristic of MoSi2-based composite materials is their thermal conductivity. The
33、se materials have a high thermal conductivity at high temperatures, allowing for efficient heat transfer and dissipation, making them ideal for use in high-temperature heat exchangers and furnaces. Furthermore, the excellent electrical conductivity of these composites makes them a potential candidat
34、e material for electrode applications in electrochemistry and other industries.The incorporation of different reinforcements into the MoSi2-based composite materials has led to the development of several advanced variants with enhanced properties. For instance, the addition of carbon fibers has led
35、to the creation of lightweight and high-strength composites with excellent toughness and wear resistance. Similarly, the inclusion of ceramic fibers has resulted in composites with exceptional thermal shock resistance and mechanical strength.In recent years, researchers have also focused on explorin
36、g the use of other materials, such as TiN, TiC, and ZrC, as reinforcements to further enhance the properties of MoSi2-based composites. These materials offer unique properties that can complement those of MoSi2, making them even more versatile and applicable in different industrial settings.The deve
37、lopment and optimization of MoSi2-based composite materials hold great significance in the quest for more efficient and durable materials for high-temperature and harsh environment conditions. The demand for such materials across various industries is continually growing, and with advancements in ma
38、nufacturing processes and the incorporation of various reinforcements, these composites are likely to become even more prevalent in the coming years.In addition to their mechanical and thermal properties, MoSi2-based composite materials exhibit excellent corrosion and oxidation resistance. These pro
39、perties make them ideal for use in harsh environments, such as chemical processing plants, where exposure to aggressive chemicals and extreme temperatures is common.The unique combination of properties exhibited by these composites has also led to their application in the aerospace and automotive in
40、dustries. For example, in the aerospace industry, MoSi2-based composites have been used to manufacture components such as turbine blades and exhaust nozzles due to their high-temperature resistance and lightweight nature. Similarly, in the automotive industry, these composites have been used for eng
41、ine parts that require high-temperature resistance and mechanical strength.Another promising application for MoSi2-based composites is in the field of renewable energy, particularly in high-temperature solar energy applications. The high thermal conductivity and excellent thermal stability of these
42、composites make them ideal for use in high-temperature solar receivers, where they can efficiently absorb and transfer heat to generate electricity.Overall, MoSi2-based composite materials have shown significant potential as a viable alternative to traditional materials in various industrial applica
43、tions. The development of new and improved manufacturing processes, coupled with the integration of novel reinforcements, is expected to lead to the production of even more advanced and versatile MoSi2-based composites, opening up new possibilities and opportunities for their use in different indust
44、ries.In addition to the applications mentioned above, MoSi2-based composites are also being explored for use in the field of medical devices and implants. Their biocompatibility and ability to withstand high-temperature sterilization make them suitable for use in medical applications that require a
45、high degree of thermal stability and resistance to corrosion.Moreover, MoSi2-based composites are being developed for use in various energy storage applications, such as batteries and supercapacitors. Their high electrical conductivity and exceptional mechanical strength make them ideal for designin
46、g advanced energy storage devices that are more reliable and efficient.Another application being explored is the use of MoSi2-based composites in the electronics industry. These composites have the potential to be used in high-temperature electronic devices, such as transistors, where their unique p
47、roperties can improve performance and reliability.Furthermore, MoSi2-based composites are being investigated for use in the production of advanced coatings and thin films. These composites can be utilized to create highly durable and corrosion-resistant coatings, suitable for use in a wide range of
48、industrial applications.In conclusion, the properties of MoSi2-based composites make them highly versatile and suitable for use in various industrial applications. Their exceptional mechanical, thermal, and electrical properties provide superior performance and durability, making them ideal for use
49、in harsh environments where traditional materials would fail. With advancements in manufacturing processes and the integration of novel reinforcements, the potential applications of MoSi2-based composites will continue to expand, making them an attractive option for various industrial and commercial applications.Another promising application for MoSi2-based composites is in the aerospace industry. The high-temperature capabilities of these materials make them i