汽车玻璃导槽密封条耐磨性改进的研究

采用橡胶-塑料复合工艺技术,为汽车玻璃导槽密封条的滑动面附着上一层改性聚乙烯(PE)材料,将其作为减摩层,并与传统的植绒减摩层产品进行耐磨性对比实验。结果表明:PE减摩层与植绒减摩层相比,其湿摩擦和干摩擦的耐磨性都得到极大地提高,改性PE减摩层耐磨性能达到植绒减摩层的3倍。     

汽车橡胶密封条静电植绒光照老化耐磨性能研究

研究汽车橡胶密封条光照老化后静电植绒耐磨性能的影响因素。根据植绒粘合剂光照老化机理和静电植绒生产工艺,分析植绒前密封条表面温度、等离子体表面处理、粘合剂的厚度、静电植绒环境、粘合剂固化温度等工艺条件对光照老化后植绒耐磨性能的影响。通过调节蠕动泵的出胶量提高植绒粘合剂的干膜厚度,提高两段固化烘箱的温度使密封条表面温度达到180℃以上,汽车橡胶密封条植绒光照老化后耐磨性能达到企业标准要求。     

汽车用橡胶制品现状与发展动向（下）

5.汽车密封条汽车上使用橡胶密封条的主要作用是密封、减震和装饰。按其功能分 ,有车窗密封条、车门密封条、顶棚防水密封条、装饰条、嵌条及其它密封条等。密封条的材质有橡胶、塑料、橡塑复合、植绒条、热塑弹性体、钢丝编织网状结构、骨架式等。目前全国汽车密封条生产厂约 60余家 ,主要分布在化工、航空航天、机械、交通、合资企业及乡镇企业中。其中多数企业为塑料或橡胶密封条单一挤出生产线 ,只有少数几家企业具有橡胶、塑料、植绒密封条的综合生产能力 ,如贵州红阳汽车密封件有限公司、淮阴橡胶制品一厂、万源德富泰斯密封制品有限…     

喷涂型聚氨酯弹性体耐磨材料主要性能表征及影响因素分析

采用二苯基甲烷二异氰酸酯和聚醚多元醇为原料反应制备A组分,聚醚多元醇、二胺扩链剂和耐磨助剂等混合制备B组分;A、B组分通过专用喷涂设备制备了聚氨酯弹性体耐磨涂层。讨论了聚醚多元醇和耐磨助剂的种类对弹性体涂层耐磨性能的影响,以及实验室干态下Akron磨耗、DIN磨耗、Taber磨耗和NBS磨耗4种磨耗之间的关系。结果表明,增滑助剂A的应用显著降低了喷涂型聚氨酯弹性体涂层的表面摩擦系数,测得动摩擦系数为0.321;聚四氢呋喃醚二醇的应用显著提高了喷涂型聚氨酯弹性体涂层的耐磨性能,测得Akron磨耗为0.030 cm3。     

喷涂距离对Al2O3-TiO2涂层组织与干摩擦性能的影响

采用大气等离子喷涂(APS)方法在Q235钢基体上制备了不同喷涂距离的Al_2O_3-13 wt%TiO_2涂层。研究了喷涂距离对涂层α-Al_2O_3相质量分数、涂层截面显微硬度、孔隙率、沉积厚度的影响,并对涂层进行干摩擦磨损实验,分析了涂层磨损失效机理。随着喷涂距离的增加,α-Al_2O_3相向γ-Al_2O_3相转化增多,涂层沉积厚度呈下降趋势。喷涂距离为130 mm时,涂层综合性能最优;沉积厚度为285μm,截面显微硬度为1172 HV0.2,孔隙率为3.4%,涂层耐磨性能最佳,磨损失效主要以显微犁削为主。喷涂距离为110 mm时涂层熔融程度不足,犁沟效应明显,喷涂距离为150 mm时γ-Al_2O_3相较多,脆性断裂显著。     

国内引进橡胶密封胶条生产线

门窗密封条现有纯胶密封条和复合密封条两种,而复合密封条又有橡胶——金属、橡胶——金属——海绵、橡胶一金属——塑料和橡胶——植绒四个类型。该密封条又因具有防水、防尘、防噪音和密封等作用而在汽车、火车、其它车辆和建筑工业门窗得到广泛应用。部分生产密封条的企业,为改善生产装     

汽车橡胶密封条技术概述

简介了汽车橡胶密封条所用原材料及产品种类、结构和性能。按安装部位，汽车橡胶密封条分为门框密封条、行李箱密封条、发动机盖密封条、导槽密封条、内外侧密封条、头道密封条和风窗密封条等类型。其弹性体多由EPDM密实胶和海绵组成，骨架有钢带、钢丝编织带和铝带几种类型。不同结构的密封条安装固定形式不同。汽车橡胶密封条对胶料耐臭氧老化、耐大气老化、耐低温等性能及成品挤压力、插人力、拔出力、植绒面耐磨性能等要求较高。     

车门弹性玻璃导槽密封条分隔立柱的结构优化

分析车门玻璃升降系统和弹性玻璃导槽密封条的结构,优化弹性玻璃导槽密封条分隔立柱的结构。结果表明:将弹性玻璃导槽密封条分隔立柱导轨底部的实心结构优化为空泡结构,并在空泡结构上方覆盖聚乙烯条,可以在实现密封和装饰功能的前提下,吸收玻璃撞击能,对玻璃旋转起到较大的缓冲作用,减轻玻璃旋转产生的撞击噪声。     

涂装涂层系统制造阶段的质量控制（Ⅳ）

6．7 湿/干涂层厚度的控制 （1）涂覆时湿膜涂层厚度的控制 一般隋况下,涂层厚度与保护寿命有近似正比例的关系,当然,需要将涂层厚度控制在合适的范围之内,否则会引起各种涂层弊病。为此,每道涂层喷涂前,要根据每层设计干膜厚度,算出湿膜厚度,然后在喷涂之前,在一块光滑平整的板上进行喷漆试验,测量出湿膜厚度的准确数,才能进行后续的喷涂工作。干、湿膜厚度的计算关系：     

聚脲弹性体材料耐磨性能的探讨

由不同二元醇与二异氰酸酯合成不同NCO含量的半预聚体(A组分)与端氨基聚醚、胺扩链剂等原料组成的R组分经喷涂设备喷涂成型聚脲弹性体。讨论了在不同摩擦工况下NCO含量、异氰酸酯指数、预聚物类型、耐磨助剂等对聚脲弹性体耐磨性能的影响。结果表明,不同NCO含量在不同摩擦工况下对聚脲耐磨性能的影响不同,干摩擦工况下NCO含量越高,耐磨性能越佳,湿摩擦工况下则是NCO质量分数为15%耐磨性最佳,异氰酸酯指数对聚脲耐磨性能的影响较小,使用聚四氢呋喃二元醇、TDI预聚物和耐磨助剂,可提高不同摩擦工况下聚脲的耐磨性能。     

铁-镍-钨合金电镀在缸套上的应用

以45钢缸套内孔表面为基体,电沉积得到Fe-Ni-W合金镀层.采用目视评价、显微硬度计.中性盐雾试验,盐水浸泡试验及干性条件的摩擦磨损试验等方法,研究了Fe-Ni-W合金镀层的外观、显微硬度、耐蚀性、耐磨性等性能.结果表明,Fe-Ni W合金镀层光亮、细致,镀层在最佳温度500～650℃下热处理2h后硬度最高可达130...     

化学镀制备高耐蚀耐磨Ni-P-SiC复合镀层

研究了Ni-P-SiC复合镀层的制备工艺和性能以及SiC含量对镀层性能的影响。采用Taber试验机对Ni-P-SiC复合镀层的磨损性能进行了测试,并用VHX-100型三维视频显微镜对磨损形貌进行了观察,分析了复合镀层的磨损机理。结果表明:SiC颗粒的加入能有效地降低摩擦副之间的犁沟效应及摩擦表面发生粘着的面积,从而减少镀层的磨损。采用电化学实验等手段研究了Ni-P-SiC复合镀层的耐蚀性能。当复合镀层均匀一致,能起到一个良好的屏蔽作用时,耐蚀性十分优异;而镀层缺陷的存在将导致耐蚀性能降低。     

高硬度耐高压水密封制品的研制

为了满足高压清洗机封水密封制品的要求,采用以锦纶布为增强体、丁腈橡胶为橡胶基体的复合结构材料,研制高硬度耐高压水密封制品。结果表明,在胶浆中添加增粘树脂可有效提高锦纶布与橡胶基体的粘合强度,添加适量促进剂H可提高胶料硬度和耐磨性能;先用粘合剂预处理原布,再进行涂覆,可明显提高锦纶布与胶料的粘合强度;通过增强粘合底层胶和耐磨表层胶组合设计,试制密封制品的硬度高,耐磨性能优良,耐水性能明显优于进口密封制品。     

Effect of laser power on microstructure and tribological performance of WC−10Co4Cr coating

In order to enhance wear resistance of cold work molds, WC−10Co4Cr coating was fabricated on Cr12MoV steel by laser cladding. The morphologies, chemical compositions, and phases of obtained coatings were analyzed using a scanning electron microscopy (SEM), energy disperse spectroscopy, and X−ray diffraction, respectively. The effect of laser power on the tribological performance was analyzed using a ball−on−plate friction machine, and the wear mechanism was also discussed. The results show that the WC−10Co4Cr coating is composed of WC and Co₆W₆C phases, and the average hardness of coating cross−sections fabricated at the laser power of 1200, 1500, and 1800 W was 1296, 1375, and 1262 HV_0.5, respectively, in which that fabricated at the laser power of 1500 W is the highest among the three kinds of coatings. The average coefficients of friction of coatings fabricated at the laser power of 1200, 1500, and 1800 W are 0.61, 0.52, and 0.59, respectively; and the corresponding wear rates are 64.38, 35.38, and 123.92 μm³•N⁻¹•mm⁻¹, respectively, showing that the coating fabricated at the laser power of 1500 W has best friction reduction and wear resistance. The wear mechanism of WC−10Co4Cr coating is fatigue wear and abrasive wear, which is contributed to the increase of hard WC mass fraction.     

合金钢导套微损伤外表面的修复研究

利用电镀技术并辅助适度的低温热处理,镀覆Ni-Si C纳米复合镀层作为修复层,修复合金钢导套微损伤外表面。采用扫描电镜表征修复后导套外表面的显微结构,用划痕法检测修复层的附着强度,并通过干摩擦试验和盐雾试验检测修复后导套外表面的耐磨性能和耐蚀性能。结果表明,修复后导套外表面平滑、均匀,组织结构致密,修复层附着牢固;修复后导套外表面的磨损量和腐蚀率均低于全新导套,磨痕形貌和腐蚀形貌也不同。Ni-Si C纳米复合镀层能够起到减摩和防护的双重作用,修复后导套外表面的耐磨性能和耐蚀性能均符合预期。     

Influence of fillers dispersion on friction and wear performance of solution styrene butadiene rubber composites

Development of structure–properties relationships between the fillers/rubber matrix interface chemistry and the dispersion and interfacial adhesion properties of the rubber composites is critical to predict their bulk mechanical and tribological properties. In this paper, three solution styrene butadiene rubber (SSBR) composites containing various fillers with tailored interfacial chemistry were prepared via conventional mixing technique. Subsequently, thermal and structural features of filled SSBR composites were monitored by TG, DSC, XRD, XPS, FESEM and TEM, respectively. Sliding contact experiments were conducted to study tribological properties of styrene butadiene rubber composites under dry and wet conditions. It was shown that the SSBR filled with silicon dioxide nanoparticles significantly reduced both the friction coefficient and the wear against marble block. On the contrary, it exhibited an increased friction coefficient and wear under wet friction conditions due to the specific superior wet‐skid resistance of silicon dioxide nanopartilce filled rubber composites, a good dispersion of silicon dioxide nanopartilce in the rubber matrix and strong interfacial adhesion between nanoparticles and rubber matrix. In addition, the influence of fillers dispersion and interfacial adhesion on friction and wear of styrene butadiene rubber composites was evaluated employing theoretical calculation, and the predicted results were in agreement with the experimental observations. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43589.     

一种托辊的改进与优化

对铁尾矿干排工艺中的核心设备水平橡胶带式真空过滤机的配套托辊实际工况进行分析研究,通过改善托辊的密封结构、包胶工艺及其制作工艺等,提出一种具有高的强度、耐磨性和良好密封性,且在铁尾矿干排工艺中使用寿命较长的托辊结构。     

Preparation and properties of wear-resistant carbonized-ceramic composite coating on pure aluminum surface

In this paper, a new composite coating was prepared on the surface of pure aluminum (Al) by combining the micro-arc oxidation (MAO) technology with the polyethylene glycol (PEG 400) carbonization technology. The composite coating and the single MAO coating were observed by a scanning electron microscope, and an energy-dispersive spectrometer, finding that the single MAO coating surface with volcano-like pores and microcracks, was covered by the carbonized layer of the composite coating where the overall coating thickness was around 19.5 µm, including 17.5 µm of inner MAO coating. The material properties of the composite coating were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The wear resistance of the composite coating was tested under dry friction conditions, finding that the wear width on the composite coating surface was 909.6 µm only, which was around 55.7%, 50.4%, and 58.2% of those for pure Al substrate, single carbonized coating, and single MAO coating, respectively. Then the comprehensive wear resistance of the composite coating was explored under different sliding speeds and lubrication mediums. Finally, the wear-resisting mechanism of the composite coating was discussed, concluding that the composite coating could effectively reduce adhesive wear and abrasive wear of the Al substrate.     

Tribological performance of DLC-coated ceramics against cemented carbide under dry sliding conditions

In order to improve the tribological behavior of Si₃N₄/TiC ceramics, DLC coating was fabricated on the ceramic surface through magnetron sputtering technology. The surface and cross-section micrographs, the adhesion between coating and substrate, the surface roughness and microhardness of the DLC-coated ceramics were investigated. Reciprocating friction tests sliding against cemented carbide ball were conducted under dry sliding conditions. The test results indicated that the DLC coating possessed superior tribological performance, which was conductive to decreasing the friction coefficient and enhancing the wear resistance of ceramics. The primary mechanisms responsible for performance improvement of the DLC-coated ceramics were attributed to the combined effects of low shear stress, excellent adhesion with substrate, high microhardness and good surface roughness. It was believed that the DLC coating was efficient in improving the load-carrying capacity and expanding the application area of ceramic materials.     

陶瓷颗粒填充聚丙烯复合材料的摩擦性能研究

用熔融共混法制备了陶瓷颗粒增强无规共聚聚丙烯复合材料,测试了复合材料的摩擦磨损性能。结果表明：在干摩擦条件下,陶瓷颗粒/聚丙烯复合材料的磨损量明显降低,继续增加填充量,磨损量变化较小并略有增大,当陶瓷颗粒含量为15%时,磨损量达到最小。复合材料的摩擦因数随着陶瓷颗粒含量的增加而增大。