模具钢在硼砂：氯化钡混合熔盐中渗铬的研究

研究了在盐浴渗铬工艺中不同Ｃｒ２Ｏ３与Ａｌ的比例以及硼砂和各种氯化盐作为基盐，对Ｔ１０钢渗铬效果的影响。探讨了硼砂加氯化钡的最佳基盐成分和渗铬最佳工艺参数。分析了模具钢渗铬层的组织结构；测定了渗层厚度和表面硬度；考核了３Ｃｒ２Ｗ８Ｖ钢渗铬层的耐磨性和ＣｒＷＭｎ渗铬层的抗高温氧化性。     

硼砂盐浴渗钒及应用

本文通过硼砂盐浴渗钒试验，对渗钒后的金相组织、显微硬度进行观测分析，对影响渗钒层的因素及其工艺特点进行分析探讨，并将此工艺应用于轴承的工模具，寿命提高五倍以上，取得较好的效果。     

低硼砂盐浴渗钒

本文对低硼砂盐浴渗钒的原理和试验方法做了较详细的叙述，并采用多种测定手段对所得到的渗层组织和性能进行了分析，同时介绍了低硼砂盐浴渗钒的优点和应用前景。     

低硼砂盐浴渗钒

本文对低硼砂盐浴渗钒的原理和试验方法做了较详细的叙述．并采用多种测定手段对所得到的渗层组织和性能进行了分析，同时介绍了低硼砂盐浴渗钒的优点和应用前景．     

硼砂盐浴渗钒及应用

本文通过硼砂盐浴渗钒试验,对渗钒后的金相组织,显微硬度进行观测分析,对影响渗钒层的因素及其工艺特点进行分析探讨,并将此工艺应用于轴承的工模具,寿命提高五倍以上取得较好的效果.     

熔盐Cr—Ti碳化物复合层涂覆技术

对表面镀铬，渗铬的钢件进行硼砂熔盐浸渍渗钛处理，可形成多元碳化物复合层。其抗冲击疲劳及抗介质腐蚀性能均明显优于单一渗数钛层。应用Ｘ－ｒａｙ衍射及电子探针技术，确定了复合层的结构。     

铸铁的渗钒组织及其耐磨性的研究

对铸铁经硼砂盐浴渗钒后的渗层组织、耐磨性及经不同方式冷却后的冲击韧性进行了研究。结果表明：铸铁的碳化钒层整齐、均匀、连续，具有较高的硬度和耐磨性，其空冷组织具有最好的强韧性     

FON工艺的研究与应用

本文叙述的 FON 工艺是一种无污染高耐蚀氮碳共渗复合盐浴新工艺。经试验证明,本工艺耐蚀性能超过硬铬电镀。不同材料的工件经本工艺处理后具有优异的减摩、耐磨、抗咬合、抗疲劳和抗腐蚀性能。本工艺已用于部分纺机零件并获得了满意的结果。     

钒—硼—稀土共渗组织与性能的研究

着重对T10,CrWMn、GCr15、Cr12等钢在一般热处理淬火温度下,实现了钒-硼-稀土共渗处理的工艺,并对渗层组织及性能进行分析。用正交试验法优选了最佳盐浴配方。试验结果证明:在提高盐浴流动性的基础上,得到较深的渗层;综合性能均优于单独渗钒、渗硼处理的效果。     

1Cr11MoNiW1VNbN钢盐浴渗铬性能研究

为提高超(超)临界汽轮机气缸高温螺栓的抗咬死性能,对高温螺栓材料1Cr11MoNiW1VNbN钢进行盐浴渗铬处理,利用光学显微镜(OM)、扫描电镜(SEM)观察了渗层的组织,利用显微维氏硬度计和纳米硬度计分析了渗层的硬度、弹性模量和韧性,利用摩擦磨损试验机测试了渗层的耐磨性能,利用动电位极化曲线和高温氧化实验研究了渗层耐腐蚀性能.结果表明:1Cr11MoNiW1VNbN钢盐浴渗铬处理后的组织由Cr23C6和Fe-Cr铁素体(柱状晶)组成,渗层硬度和弹性模量较低,韧性较高,材料的耐磨性、耐电化学腐蚀和抗高温氧化性能得到了明显提高,这将是一种防止高温螺栓咬死的有效方法.     

Composition variation of borax salt during the process of vanadizing by thermal diffusion

Vanadium pentoxide,borax,boron carbide and sodium fluoride were used to grow vanadium carbide coating on surface of Cr12 steel at 950 ℃ by TD process.The coating of vanadium carbide(VC)extended the serve-life period of Cr12 steel as punching die.Kinetics of vanadium carbide coating growth was brought forward and verified by comparison of the mathematical model with the experimental results.The thickness of coating was illustrated by SEM.The chemical constituent of coating and remnants were tested by X-ray diffraction(XRD)and X-ray energy dispersive spectroscopy(EDS).To increase the thickness,rare earth silicon powder(FeSiRe23)was added to the borax salt bath.The analysis of XRD revealed that FeSiRe23 increased the depth of vanadium car-bide coating as reducing agent and catalysis.     

Vanadium carbide coating growth on die steel substrate in borax salt bath

Vanadium pentoxide, borax, boron carbide and sodium fluoride were used to grow vanadium carbide coating on die steel(Cr₁₂, Cr₁₂MoV) surface at 950 °C by TD process, which extended the life period of Cr₁₂ and Cr₁₂MoV as punching die. Kinetics of vanadium carbide coating growth was brought forward and verified by comparison of the mathematical model with the experimental results. The thickness of coating was illustrated by SEM. The chemical constituent of coating and remnants were tested by XRD. To increase the thickness, rare earths (FeSiRe₂₃) were added to the borax salt bath. The electronic probe microanalysis (EPMA) revealed that the addition of rare earths could decrease carbon concentration in the coating and increase the depth of vanadium carbide coating.     

硼砂熔盐被覆VC机理的探讨

探讨在硼砂熔盐中被覆VC时的化学反应及其动力学过程。系统地讨论硼砂熔盐特性及主要成分、操作温度、合金元素等对反应速度的影响。并提出VC形成时的碳原子扩散途径:开始碳原子从固溶体中扩散至基体金属表面直接与钒结合,以后的碳原子扩散至基体金属表面,需再穿过VC晶格间隙,扩散至被覆层表面,才与钒结合成VC,使被覆层逐渐加厚。     

可再生氰酸盐盐浴在手用钢锯条生产中的应用

可再生液体碳氮共渗新工艺，已在锯条行业推广应用了三年，在其锯条质量、工艺操作、新旧工艺衔接、降低成本、治理环境污染等方面均获成功．目前新工艺在国内生产的锯条每年已达８．８亿支．生产结果证明：新工艺可完全取代原有的传统氰化钠盐浴和尿素盐浴工艺，具有渗速快、硬度高、锯切性能好、节约能源、渗层均匀、碳氮浓度容易控制等优点．     

Growth characteristics and kinetics of niobium carbide coating obtained on AISI 52100 by thermal-reactive diffusion technique

Niobium carbide coating was produced by thermal-reactive diffusion technique on AISI 52100 steel in salt bath at 1 123 K, 1 173 K, and 1 223 K for 1, 2, 4, and 6 hours. The salt consisted of borax, sodium fl uoride, boron carbide, and niobium pentoxide. The presence of NbC phase on the steel surface was confi rmed by X-ray diffraction analysis. Microscopic observation showed that niobium carbide coating formed on the substrate was smooth and compact. There was a distinct and fl at interface between the coating and substrate. The micro-hardness of niobium carbide coating was 2892±145HV. The thickness of coating ranged from 1.6 μm to 14μm. The forming kinetics of niobium carbide coating was revealed. Moreover, a contour diagram derived from experimental data was graphed for correct selection of process parameters. Some mathematical equations were built for predicting the coating thickness with predetermined processing temperature and time. The results showed that these mathematical equations are very practical as well as the kinetics equation.     

低温电解磁化渗硫工艺及减摩特性的研究

采用外加磁场对碳氮共渗的20CrMnTi钢进行磁化低温电解渗硫处理,着重探讨了磁化低温电解渗硫工艺的影响因素,特别是添加剂和磁化作用的影响,进而优化工艺参数,并利用摩擦磨损试验研究该渗硫层的减磨特性.结果表明,添加剂K3Fe（CN）6有效降低盐浴粘度,提高电导;外加磁场改善了电解质的分散能力,提高盐浴的电导和稳定性,促进渗硫过程的进行,延长盐浴寿命.外加磁场的低温电解渗硫最佳工艺参数为电流密度0.2 A/dm2,外加磁感应强度0.07 T,添加剂1％K3Fe（CN）6,温度190℃,时间15 min.获得20 μm左右厚度均匀的渗硫层,明显降低摩擦系数并显著提高了工件的抗磨损和抗咬合能力.     

新型无污染盐浴软氮化工艺的研究与应用

对新型无污染盐浴软烨工艺进行了试验研究。研制了新型无污染盐浴软氮化的基盐,再生剂以及相应的盐浴软氮化设备。经生产实际对比,盐浴的性能和再生剂的效果达到了国外同种工艺的技术要求。     

液体软氮化渗层质量的研究

采用以尿素为主要原料的液体软氨化工艺，对阀杆（３５钢）进行了氮化处理。并通过不同配方、不同温度及时间，对渗层疏松及渗层深度作了对比试验。试验结果表明，渗层疏松主要是由于盐浴内ＣＮＯ－浓度过高所致；而渗层深度则随氮化温度、氮化时间及其盐浴成分配方的不同而变化。