消失模铸铁件表面渗钒工艺研究

在泡沫模表面涂覆富钒涂料，利用浇注时的高温和铁液的作用，使涂层被烧结成合金层，同时，涂层中的钒渗入铸铁基体组织中，形成渗钒层。结果表明，铸铁表面形成富钒的铁基涂层厚度达500μm以上；同时，涂层中的钒原子进入到铸铁基体中达1mm以上，使基体中出现合金化层；涂层与基体具有良好的冶金结合。由外向内，铸件表层显微结构依次是涂层、合金化层和基体。涂层和合金化层以溶解一定量合金元素的铁素体为主，基体层是铁素体＋石墨。钒原子与硅原子在涂层的表面浓度最大，随后逐渐降低。在合金化层中氧原子浓度很高，且在涂层与合金化层的界面区域出现了氧原子堆积。涂层的显微硬度范围500～800HV。     

Micro-abrasion resistance of thermochemically treated steels in aqueous solutions: Mechanisms, maps, materials selection

The area of micro-abrasion is an interesting and relatively recent area in tribo-testing methodologies, where small particles of less than 10 μm are employed between interacting surfaces. It is topical for a number of reasons; its direct relation to the mechanisms of the wear process in bio-tribological applications, ease in conducting tests and the good repeatability of the test results. It has widespread applications in conditions used in the space and offshore industries to bio-engineering for artificial joints and implants.There have been many recent studies on the micro-abrasion performance of materials, ranging from work basic metals to nano-structured coatings. However, no significant work is reported on the micro-abrasion resistance of thermochemically treated steels. Hence, this paper looks at the performance of two thermochemically treated steels, Tenifer bath nitride stainless steel (T-SS) and vanadized carbon steel (V-CS) in such conditions with reference to the stainless steel (SS) by varying the applied load and sliding distance.The results indicated that T-SS demonstrates exceptionally poor resistance to micro-abrasion. It was observed that the heat treatment process and properties of the hardened layer (hardness and thickness) are extremely important in determining the micro-abrasion resistance of such steels. Finally, the results were used to develop micro-abrasion mechanism and wastage maps, which can be used to optimize the surface treated materials for micro-abrasion resistance.     

NaF在中性盐浴渗钒中的作用

通过化学热力学计算,分析了中性渗钒盐浴中可能发生的化学反应,发现 Ｎａ Ｆ不参与盐浴中供钒剂与还原剂之间的化学反应其活化机理是 Ｎａ Ｆ通过与还原剂颗粒表面的反应产物反应,清洁了还原剂颗粒表面,使还原剂保持了活性,从而使渗钒盐浴中的活性 Ｖ 原子保持一定的浓度     

盐浴渗钒技术的发展概况

本文介绍了国内外盐浴渗钒技术的发展;对各种盐浴渗钒工艺方法进行了综合评价;阐述了盐浴渗钒的机理;在此基础上提出内热式中性盐浴渗钒技术的研究意义和应用前景。     

中性盐浴渗钒的研究

本文研究了一种中性盐浴渗钒剂，其特点是渗钒速度快，盐浴流动性好，粘盐少，易清理。对T12钢经950℃×6h渗钒处理，所得渗钒层厚度为15～17μm，硬度高而脆性小。文中还对中性盐治渗钒层的形成机理进行了分析。     

Cr12型模具钢粉末固体渗钒研究

研究了Cr12型模具钢粉末固体渗钒的工艺方法与应用效果.检验分析了其渗钒层组织结构、渗层厚度、硬度及耐磨性，探讨了其应用前景。     

TD法混合盐浴渗钒在SDC99钢上的研究

对SDC99新型冷作模具钢的TD法盐浴渗钒配方进行了研究,确定出最佳的混合盐浴配方为75.6%硼砂+8.4%BaCl2+10%V2O5+6%Al粉。用该配方对SDC99钢进行950℃×4 h渗钒处理,能获得均匀、连续的碳化钒覆层。SDC99钢的碳化钒覆层与对比试验的Cr12MoV钢所获厚度相当,认为这是碳与钢中各种合金元素相互作用的结果。