共查询到20条相似文献,搜索用时 78 毫秒
1.
铜箔高温防氧化新工艺研究 总被引:1,自引:0,他引:1
本文简要介绍了铜箔在180℃防氧化指标要求及防氧化工艺进展情况,设计了新的钝化液组成及工艺条件,获得了较为理想的铜箔180℃防氧化性能,并在生产中得到验证,对相关性能进行了测定,并对防氧化机理进行了探讨。 相似文献
2.
3.
为了解决常规直燃式热处理炉中存在的工件表面氧化问题,本文基于Navier-Stokes方程,在烧嘴处设计了收缩-扩张空气通道结构,在炉墙内设置了烟气回流通道与烧嘴喉部相连,开发出防氧化燃烧技术。为了对该技术进行整体优化,通过数值仿真的方法计算了多种结构、多种工况下常规与防氧化的直燃式热处理炉在同工况下的温度场及氧浓度场。仿真结果表明,防氧化炉的炉膛平均温度降低至常规炉的93%~97%,高氧区面积降低至常规炉的35%~41%。以优化后的结构和工况为依据,将防氧化燃烧技术应用于工业生产,现场实测数据表明表面氧化率降低至常规炉的34%~50%。 相似文献
4.
含Al,Ti和Zr的活性合金连接陶瓷的防氧化 总被引:1,自引:0,他引:1
研究了含Al、Ti和Zr等易氧化元素的合金连接陶瓷时的防氧化问题。结果表明,对于易变形的活性合金,施加适当的压力可防止在大气中直接连接陶瓷时连接区中合金的氧化;常规高真空环境下连接时,试样放于开有小长孔的夹具中也可以达到良好的防氧化效果。两种防氧化措施的原则是连接区或试样周围局部含氧量减至不影响活性合金与被连接材料的结合 相似文献
5.
我国早在60年代就对热处理防氧化涂料进行了研究,取得了很大的成绩,目前有些产品在市场上销售,但这些涂料大多存在价格昂贵、性能不稳定等缺点,使用受到一定的限制。本研究就是要寻求一种工艺和使用性能稳定,防氧化效果显著,价格便宜的热处理防氧化涂料。1试验方法1.1涂料的组成和涂敷方法涂料的组成:耐火膨润土+玻璃粉个稀土+辅助添加剂+水。原料经研磨至250目以上,按比例混合均匀并加水调制成糊状,放置出后即可使用。涂敷方法;先将工件表面的油污除净,然后用毛刷在工件表面均匀涂刷涂料,涂层厚度约为0.1~0.3mm,刷完后在… 相似文献
6.
7.
硼化物抑制石墨电极氧化研究 总被引:2,自引:0,他引:2
采用硼化物溶液浸渍石墨电极,测试不同浸渍量的试样在模拟炉中氧化失重率,物理性
能及表面形态,结果表明,硼化物在高温状下能在石墨电极表面形成连续防氧化保护膜填塞表面孔隙,
延缓或抑制石墨电极氧化,可使其消耗降低15%左右。 相似文献
8.
为了防止镀铜焊丝表面变色,本文作者对镀铜焊丝后处理开展了研究工作,研制出一种防氧化乳化液。将其涂于镀铜焊丝表面,可有效地防止焊丝变色。 相似文献
9.
本文介绍一种新型的粗化铜箔酸性防氧化处理工艺的配方、设计过程及其原理,对主要工艺条件和影响因素进行总结。 相似文献
10.
11.
12.
13.
B. Khorkounov A. Gebert Ch. Mickel L. Schultz 《Journal of Alloys and Compounds》2008,458(1-2):479-486
Amorphous Mg61Ni30Y9 powder was produced by mechanical alloying using a Retsch planetary ball mill under liquid nitrogen cooling. Additional gentle milling with graphite powder resulted in a thin graphite coating of powder particles. Further milling with a high energy SPEX mill transferred the alloy into a fully nanocrystalline state. The morphological and microstructural changes were followed by means of XRD, SEM, TEM and DSC. Hydrogen storage electrodes based on those alloy powders were fabricated and their cathodic and anodic polarization behaviour and their charge–discharge cycling behaviour in 6 M KOH solution were investigated. It was found that the alloy modification from a non-defective amorphous to a highly defective nanocrystalline state is more effective for improving the hydrogen sorption properties of the alloy than the graphite coating, but is detrimental for the alloy passivation. Accordingly, a SPEX-milled powder electrode exhibits with Cmax = 570 mAh/g a higher maximum discharge capacity than a coated Retsch-milled powder electrode with Cmax = 435 mAh/g, but degrades faster during repeated cycling. Using graphite powder supporting material for electrode preparation on a nickel foam carrier was found to be much more beneficial than nickel powder for achieving maximum discharge performance. 相似文献
14.
采用电火花沉积方法将YG8电极材料沉积在球墨铸铁轧辊材料上,制备了WC沉积涂层,研究了其微观组织及耐磨性能.结果表明:沉积层主要由Fe_3W_3C、Co_3W_3C、W_2C和Fe_7W_6等相组成,沉积层与基体呈冶金结合,Fe_7W_6、W_2C等硬质相弥散分布于沉积层中,部分区域硬质相达到了纳米颗粒尺寸;沉积层硬度分布不均匀,平均硬度为1759 HV0.3;沉积层具有优异的耐磨性,其磨损性能是基体的3.7倍;沉积层的磨损机理以粘着磨损和疲劳磨损为主,细小的弥散分布的硬质相是沉积层硬度以及耐磨性提高的主要因素. 相似文献
15.
采用H0 8A焊芯 ,钛铁、钒铁、人造金红石和石墨等药皮组分 ,研制了新型耐磨、免预热堆焊焊条。通过扫描电镜 (SEM)、能谱分析 (EDAX)、磨粒磨损试验、焊条工艺性能试验以及硬度测试 ,系统地研究了焊条药皮组分对堆焊层耐磨性、抗裂性、工艺性能及堆焊层组织结构的影响。试验结果表明 ,通过电弧高温冶金反应 ,,药皮中Fe -Ti、Fe-V与石墨反应生成TiC、VC硬质相 ,并弥散分布于低碳马氏体 残余奥氏体的基体上 ,堆焊层具有良好的耐磨性和抗裂性 ,焊前不预热 ,连续堆焊堆焊层不产生裂纹。Fe-Ti、Fe -V与石墨的加入量对堆焊层耐磨性、硬度以及工艺性能影响很大 ,随着钛铁、钒铁、石墨量增加 ,堆焊层硬度、耐磨性增加。但药皮中钛铁超过 18%后焊条工艺性能变差 ,石墨超过 12 %后 ,堆焊层耐磨性降低 相似文献
16.
17.
By using H08A bare electrode and the coating fluxes of ferrotitanium, rutile, graphite, calcium carbonate and calcium fluoride, a new type of wear and crack resistant hardfacing electrode was developed. The microstructure and wear properties of deposited layer were studied by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometry(XRD) and wear test. The results indicate that TiC particles are produced by direct metallurgical reaction between ferrotitanium or rutile and graphite during welding process. TiC particles with sizes in the range of 3 - 5μm are dispersed in the matrix of lath martensite and retained austenite. The deposited layer of the new type of hardfacing electrode possesses better wear and crack resistance than that of D618 and D667 hardfacing electrodes. 相似文献
18.
19.
Electric-spark deposition (ESD) was adopted for depositing a Ti(CN)-based ceramic coating on the TC4 titanium alloy substrate using a laboratory-developed electric-spark deposition system, a nitrogen-sealed atmosphere and graphite electrode. The surface morphology, microstructure, interfacial behavior between the coatings and substrate, phase and element composition of the coatings were investigated by scanning electron microscope(SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES). Microhardness profile was measured with a Vickers microhardness tester. The results show that metallurgical bond between the coating and substrate is realized and the phase of coatings are made up of Ti(CN ) spherocrystal and dendritic crystal, TiV and C. Ti(CN) ceramic particles, which is in-situ synthesized by the reaction among titanium from the substrate, carbon from the graphite electrode and nitrogen from the shielding nitrogen gas, is about 600nm and distributes dispersively among the coatings. Microhardness profile falls off with the coatings thickness increasing and the highest microhardness values of the superficial coating could be up to 1496HV, which is six times more than that of the substrate. 相似文献
20.
为了提高硅晶体电火花成形加工效率、降低电极损耗,采用丙三醇水溶液作为工作介质。分析了介质中的碳、氢、氧元素对加工效果的影响,以及电导率、粘度、介质成分对加工特性的影响,研究表明:击穿放电间隙受电导率与粘度的影响,丙三醇水溶液可提高放电间隙,增强加工稳定性;丙三醇分子会在放电高温下分解出碳分子,其自身的微观爆炸力可促使碳分子和极间蚀除产物向两极移动,增强了电极的涂覆效应,降低了电极损耗。工艺实验结果表明:丙三醇水溶液的加工特性优于去离子水,采用质量分数为30%的丙三醇溶液加工时的最佳占空比为1∶7,加工效率为11.88 mm~3/min,电极损耗比为3.7%。 相似文献