氢氧化铝焙烧炉电收尘回收料利用途径选优

通过对收尘微分粒度、比表面积、焙烧程度等物化特性的研究，指出将其水洗除杂焙烧后可变为附加值极高的低钠α－Ａｌ２Ｏ３，并根据山西铝厂实际提出具体实施方案及效益估算。     

Al—Si合金等离子涂层Ni—Cr—B—Si的激光重熔

利用５ｋＷ ＣＯ２激光器重熔Ａｌ－Ｓｉ合金表面的Ｎｉ－Ｃｒ－Ｂ－Ｓｉ等离子喷涂层。ＳＥＭ和ＴＥＭ分析结果表明，激光熔层内晶化区和非晶化区共存，在后续熔区的传热作用和周围结晶潜热作用下，有部分非晶晶化为Ｎｉ３Ａｌ纳米晶（２－５ｎｍ），其中一些逐渐长大成为细小的粒状晶。未晶化区硬度极高（ＨＶ＝１２３５），是原等离子喷涂层硬度的４倍。     

钽基复合材料

钽基复合材料美国ＬｏｓＡｌａｍｏｓ国家实验室新近开发成功一种耐蚀性极高的新型复合材料Ｔａ－Ｔａ２Ｃ复合材料，解决了传统耐蚀材料都难以应付的象氯气、某些熔盐和熔融金属（钙、钚等）之类苛腐蚀环境中的耐蚀性问题。这种钽基复合材料可用于各种熔盐／熔融金属系统...     

石墨流态炉快速氮碳共渗工艺研究

对０８钢制碾米机筛片进行石墨流态炉快速氮碳共渗工艺研究。结果表明，以空气为流化气的石墨流态炉，添加适量活化气ＮＨ３及少量ＣＯ２进行奥氏体氮碳共渗１５￣４０ｍｉｎ，即可获得２０￣５５μｍ致密的ε化合物层。经２５０℃回火ε相低氮侧强烈时效，使渗层硬度高达８００￣１０００ＨＶ０．０２，与起缓冲作用的次表中等硬度淬火层回火产物相配合具有极高的耐磨性、抗蚀性及较小的脆性。工件表面呈均匀的蓝黑色。石墨流态炉作     

飞行器舵面液态模锻模具设计

１引言舵面（如图１）为飞行器上的一个重要零件，它的质量直接关系到飞行器的控制准确性，所以其形状、尺寸、精度、性能、重量误差等各方面都有较高要求。原生产工艺为先锻制方坯，再在数控加工中心上加工出流线翼形，然后加工其它部位。此工艺能保证生产出合格产品，但工艺复杂，周期长，材料利用率低（＜７Ｏ），生产成本极高（＞２４００元／件）。经过改进，现采用液态模锻方法生产，可取得显著的技术＼经济效果。ＺＸｉ艺分析（１）舵面各处壁厚差大，性能要求高，不能用压铸方法生产，而用液态模锻方法生产较为合适。（２）舵面流线…     

镍基耐热超合金的TLIM扩散焊接及其新发展

镍基耐热超合金的ＴＬＩＭ扩散焊接及其新发展镍基超合金，以其具有极高的抗热性和优良的耐腐蚀性而广泛应用在航空、航天、石油、化工工业中，其中的一些材料是制造飞机喷气发动机、火箭发动机、汽轮机中在极高温度下工作的零件的基本材料。然而，这类材料在采用熔焊方法...     

合金相结合因子和界面结合因子的计算方法及其在合金设计中的应用

以固体与分子经验电子理论（ＥＥＴ）和改进的Ｔｈｏｍａｎ－Ｆｅｒｍｉ－Ｄｉｒａｃ（ＴＦＤ）理论为基础,以合金奥氏体,合金马氏体及其界面为例,给出了相结构因子ｎＡ,Ｆ＾Ｄｃ,Ｓ和界面结合因子ρ,△ρ,σ的计算方法,计算了常用合金元素在０．２％Ｃ和１．０％Ｃ钢中的相结合因子和界面结合因子,用相结构因子和界面结合因子阐述了强韧性良好的２０ＣｒＮｉ３钢和２０Ｃｒ２Ｎｉ４钢的强韧化机制和耐磨性极高的ＺＧＢＭｎ     

Ti3Al─Nb合金不同组织状态下拉伸断裂行为显微分析

用透射电镜及备有拉伸装置的Ｓ５７０扫描电镜，研究了Ｔｉ３ＡｌＮｂ（Ｔｉ２４Ａｌ１４Ｎｂ３Ｖ０．５Ｍｏ）（摩尔百分数）合金在不同热处理制度下的组织形貌以及试样的拉伸断裂过程。结果表明：合金在α２＋β两相区固溶１ｈ水冷处理，组织由α２相、Ｂ２相和ｏ相组成。初生α２相体积分数不同，合金试样拉伸断裂机制不同，初生α２相体积分数低时，变形主要在Ｂ２相，裂纹主要在Ｂ２相内形核，随着Ｂ２相的减少，合金塑性提高。初生α２相体积分数高时，变形主要在α２相，裂纹主要萌生于α２相内，随着Ｂ２相的增多，合金塑性提高。细小的随机分布的针状α２相对合金拉伸断裂行为有良好作用。随固溶温度升高，α２相中位错密度逐渐减少，Ｂ２相中位错密度逐渐增多     

Al2O3—ZrO2和合纳米超微粉的制备及其特性研究

以高纯铝屑和氯氧化锆为主要原料，用化学共沉淀－－凝胶工艺分别制备出平均径约１０ｎｍ的纯ＺｎＯ２、Ａｌ２Ｏ３－５０ＺｒＯ２、Ａｌ２Ｏ３－２０ＺｒＯ２三内米超微粉，其中ＺｒＯ２基本以ｔ相结构存在。在不同温度煅烧后，纯ＺｒＯ２粉粒迅速长大而转变为单相，Ａｌ２Ｏ３－ＺｒＯ２复合粉粒长大困难，并使ＺｒＯ２仍主要以卤方相存在，Ａｌ２Ｏ３以非晶态存在。表明ＺｒＯ２纳米粉粒以四方相以室温下稳定存在的原因是尺寸２效     

胱氨酸加速化学沉积镍的机理

研究了胱氨酸对化学沉积镍的速度，析氢量和反应活化能影响及对Ｈ２ＰＯ２氧化和Ｎｉ＾２＋还原速度的影响，分析了化学镀镍层的元素组成和价态，结果表明，胱氨酸是通过它在金属表面吸附，并与吸附在金属表面的Ｈ２ＰＯ２中的Ｐ相互作用，加速了Ｈ２ＰＯ２中Ｐ－Ｈ键的断裂，稳定了反应中间体－ＨＰＯ２自由基，使原子氢浓度升高，从而加快了Ｎｉ－Ｐ镀层的沉积速度与析氢的速度。     

Casting effect on softening of metallic glasses

Cooling rate-induced softening in Y-based metallic glasses were verified in this work. By varying the speed of the roller in the melt-spinning process, it is found the hardness of the ribbon decrease with the cooling rate. Nanoindentation test also indicated that the ribbon at a higher cooling rate shows higher deformation energy. Contrary to crystalline materials, whose hardness usually increases with the cooling rate, the softening of metallic glasses is attributed to high concentration of defects frozen by fast cooling, and thus more structural relaxation during deformation.     

快速凝固Fe-C-Si-Mo合金的晶化行为与硬度SCIEI

本文用单辊法制备了Fe-C-Si-Mo合金快速凝固薄带.研究了Fe-C-Si-Mo合金快速凝固薄带的晶化行为、相组成变化和硬度变化规律.经热处理后,该合金具有很高的Vickers硬度值,X射线衍射和SEM分析表明,硬度的提高是由于晶化时形成大量尺寸很小的碳化物。     

Preparation of 2D carbon ribbon/Al2O3 and nitrogen-doped carbon ribbon/Al2O3 by using MOFs as precursors for removing high-fluoride water

2D carbon ribbon/Al₂O₃ was synthesized with two-dimensional metal organic frameworks 2D-MOFs as precursors using the solvothermal and calcination methods. Batch experiments of adsorption parameters such as pH, liquid/solid ratio, adsorption kinetics, adsorption thermodynamics, and anions competitions were investigated to understand the adsorptive behavior of fluoride on carbon ribbon/Al₂O₃ and nitrogen-doped carbon ribbon/Al₂O₃. The adsorption of fluoride on carbon ribbon/Al₂O₃ could be described as the chemical and multilayer adsorption, while the adsorption of fluoride on nitrogen-doped carbon ribbon/Al₂O₃ followed the chemical and monolayer adsorption phenomenon. The fluoride on nitrogen-doped carbon ribbon/Al₂O₃ had a much faster adsorption rate of 3.1×10⁻⁷ m/s than carbon ribbon/Al₂O₃, which was 1.2×10⁻⁷ m/s. The nitrogen-doping on carbon ribbon enhances structural defects and improves the adsorption performance of fluoride. Also, the diacetylene linkages (—C≡C—) and pyridinic-N were studied to understand their influences on removing fluoride. The result indicates that carbon ribbon and nitrogen-doped ribbon could serve as good adsorbents for removing fluoride.     

T6态AlMgCu铝合金激冷甩带的反常析出行为(英文)

利用高分辨透射电镜和硬度测试表征时效态AlMgCu铝合金激冷甩带的析出相组成。铸态合金甩带的冷却速率通过经验公式计算为1.60×105 K/s。T6态热处理是试样经固溶处理后再进行200°C保温16 h的时效处理。结果表明,T6态AlMgCu铝合金激冷甩带含有Al2CuMg相和反常非晶SiO2两种析出相。Al2CuMg析出相的晶体结构和成分配比与文献[Wang et al.(2007;2005)]结果一致。综合实验结果分析表明,反常非晶SiO2相的析出可能与激冷甩带具有高的冷却速率有关,它的析出对其硬度的影响不大。     

Light emission, chip morphology, and burr formation in drilling the bulk metallic glass

The chip light emission, chip morphology, burr formation and machined surface in drilling of Zr-based bulk metallic glass (BMG) material are investigated. This study demonstrates that the work- and tool-material as well as the feed rate and spindle speed, two drilling process parameters, all affect the onset of chip light emission. Slow feed rate and high spindle speed increase the specific cutting energy and promote the exothermic oxidation and light emission of the chip. Six types of chip morphology, powder, short ribbon, long ribbon, long spiral, long ribbon tangled, and fan, are observed in BMG drilling. The long ribbon tangled chip morphology is unique for BMG material. On the machined surface under quick stop condition, the fracture topography unique to metallic glass with tributary, void, and vein patterns is observed. Different burr formations are observed: the roll-over shape in the entry and the crown shape in the exit edge. The size of burr in the exit edge is typically larger than that in the entrance edge. High feed rate helps to reduce the size of burr in both entrance and exit edges. This study concludes that the WC–Co tool-material, due to its high thermal conductivity and hardness, performs better in drilling BMG than the high speed steel tool.     

Effects of Zr on microstructure and mechanical properties of Al-Cu base ribbons spun by planar flow casting

The effects of the Zr addition on the solidification behavior and mechanical properties of the AI-Cu alloy ribbon have been investigated. Zr addition reduced the average grain size of the ribbon at the wheel-side surface, and promoted the microstructural transition into cellular/dendritic structure. Another noteworthy effect of Zr was the homogenization of the microstructure. The addition of Zr up to 0.5 wt.% in the /U-4.3 wt.% Cu ribbon resulted in a considerable increase in hardness at both the wheel-side and the air-side surfaces. The yield strength increased with the addition of Zr due to the grain refincment and more homogeneous distribution of ZrAI, particles. despite no noticeable improvement of the ductility.     

M2高速钢激光表面钴合金化的研究

研究了Ｍ２高速钢激光表面Ｃｏ合金化的组织和性能。着重分析了激光工艺参数对合金化层中Ｃｏ浓度的影响。结果表明，采用激光表面合金化，可使Ｍ２高速钢表面Ｃｏ浓度在２％－５％。合金化层听Ｃｏ浓度主要与激光扫描速度和预沉积的Ｃｏ的厚度有关。退火态的Ｍ２高速钢在激光Ｃｏ合金化后，硬度可达８００ＨＶ。经淬火回火处理后，硬度可达１１５０ＨＶ，明显高于未进Ｃｏ合金化的Ｍ２高速钢。     

添加纳米TiO2的Ni-P化学复合镀层显微结构与性能

采用化学复合镀法制备了Ni-P-纳米TiO2复合镀层,研究了纳米TiO2添加对Ni-P复合镀层的显微结构、硬度、耐磨性、孔隙率及耐蚀性的影响,并讨论了其影响机理。结果表明:纳米TiO2粒子较为均匀地分布在Ni基镀层,未发生明显团聚;纳米TiO2粒子的弥散强化作用,使复合镀层具有较高的表面硬度和良好的耐摩擦性能,晶化热处理后的复合镀层表面硬度达到了10 925 MPa,耐摩擦性能也显著提高。添加纳米TiO2粒子后,镀层的孔隙率增加,耐碱和耐盐腐蚀的能力稍有降低,耐HCl溶液腐蚀的能力较差。     

纳米CeO2/Zn复合材料制备及其性能研究

采用高能球磨法制备了纳米CeO2/Zn复合粉末,用粉末冶金真空热压烧结制备了纳米CeO2/Zn复合材料块体;利用X射线衍射（XRD）、场发射扫描电镜（FESEM）等测试分析手段,对复合粉末、块体组织结构进行了研究;比较了不同纳米CeO2含量的Zn复合材料的耐蚀性和硬度并优选出耐蚀性和硬度最好时CeO2的最佳含量范围.结果表明,纳米CeO2颗粒的加入能显著提高金属的耐蚀性、硬度和金属结构的致密均匀性.并于纳米CeO2含量在1%时显示了最佳的耐蚀性、硬度和微观组织结构.     

超音速等离子喷涂工艺参数对 Cr2O3涂层硬度的影响

目的研究影响超音速等离子喷涂Cr2O3涂层硬度的主要因素,制备出高硬度涂层。方法首先采用单变量法研究超音速等离子生成气体压力(空气压力)和喷涂距离对涂层显微结构的影响,然后采用正交试验研究喷涂电流、空气压力、喷涂距离对Cr2O3涂层硬度的影响。结果工艺参数对Cr2O3涂层硬度影响的主次顺序为:空气压力>喷涂电流>喷涂距离。结论获得高硬度涂层的最佳工艺参数组合为:空气压力0.4 MPa,喷涂电流270 A,喷涂距离200 mm。在该工艺条件下获得的涂层致密、均匀,孔隙率小。