Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract: none
Subjects: Materials Science >> Materials Science (General) submitted time 2017-04-10 Cooperative journals: 《材料研究学报》
Abstract:通过真空熔覆技术在 ZG45 表面制备了 Ni-Co/WC+G 复合熔覆层,观察并分析了复合熔覆层的显微组织 形貌和物相组成,通过摩擦磨损试验研究了石墨含量对复合熔覆层摩擦磨损性能的影响。结果表明,呈三维 网状织构形貌的复合熔覆层材料内部由于石墨的加入形成许多细小的“石墨孔洞”,这些“石墨孔洞”在摩擦过 程中可以作为贮存的润滑介质,增强复合材料的摩擦学性能。随着石墨含量的增加复合熔覆层的摩擦系数、 磨损率和 GCr15 钢对磨盘的磨损量逐渐降低,石墨含量为 6%时最小; 石墨含量为 8%时,对磨盘的磨损量又突 然上升,增幅达 70%。
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-18 Cooperative journals: 《材料研究学报》
Abstract: A nickel-based (Ni0) composite coating, which was reinforced with 20%WC and 6% graphite particles and has a texture-like section morphology, was fabricated on steel substrate by vacuum cladding technology. Then its microstructure and tribological property under dry friction condition were characterized in comparison with other three coatings (Ni0, Ni0+20%WC and Ni0+6% graphite). The results show that the WC particles evenly distributed in the nickel-based (Ni0) alloy coatings and formed a special 3D reticular microstructure. The Ni-based alloy coating is mainly composed of γ-Ni solid solution, hard phases (Cr7C3, Cr23C6, CrB) and eutectic phases (Ni3Si, Ni3B). The cladd composite coating consisted of Ni0 with WC and graphite particles exhibits the highest wear resistance among the test coatings. The combination of texture-like structure (which was composed of WC particles and nickel base alloy) and graphite lubricant promoted the abrasion resistance of the composite coating by about 9.6 times in comparison to the pure Ni0 coating.
Subjects: Astronomy >> Astrophysical processes submitted time 2017-09-26 Cooperative journals: 《天文研究与技术》
Abstract:传统光学天象厅因为节目制作难度大,成本高昂,功能扩展困难等缺点逐渐被功能强大的数字天象厅取代。随着天文教育和科普的深入推广,国内对数字天象厅的需求越来越大。数字天象厅的核心是球幕投影技术。针对球幕投影技术存在的一些技术问题,如自动化程度不高,需要人工干预等,提出了面向中小型球幕天象厅易于实现的多投影自动拼接方案。对方案中的几何校正、亮度校正、颜色校正等核心功能进行了详细的论述。该方案便于操作,易于实现,对中小型球幕有良好表现,对大型球幕也有借鉴意义。