专利文摘

正一种高温抗氧化玻璃陶瓷涂层的制备方法专利申请号:CN201010263966.6公开号:CN101935166A申请日:2010.08.26公开日:2011.01.05申请人:陕西科技大学一种高温抗氧化玻璃陶瓷涂层的制备方法,首先将玻璃料烘干后用干法球磨得玻璃粉,将玻璃粉加入溶剂中经充分搅拌制成浆料;对工业纯钛或者钛合金试样的表面进行预处理,然后将浆料涂覆在     

镍基高温合金陶瓷涂层的制备及性能表征

以Cr2O3粉、玻璃料及黏土为原料制成料浆,通过喷涂将其涂覆在镍基高温合金GH44的表面,采用热化学反应法于1050°C保温10min,熔烧制备出高温陶瓷涂层。通过扫描电镜和X射线衍射分析了高温陶瓷涂层的表面和截面形貌以及相组成,对涂覆陶瓷涂层的镍基合金的抗热震性能、抗氧化性能以及高温疲劳性能进行了测试。结果表明,陶瓷涂层结构致密,与基体结合牢固,具有良好的抗热震性能。涂覆陶瓷涂层的镍基合金其高温抗氧化性相对于基体提高了6倍以上,其高温疲劳性能明显改善。     

钛合金表面涂烧生物活性玻璃陶瓷涂层的性能与结构

采用涂烧法在钛合金表面制备出结合强度高,化学稳定性好,防组织液渗透和生物相容性良好的复合生物玻璃陶瓷涂层。用XRD,FT－IR等方法研究了涂层的组成、结构和性能。结果表明：底釉由玻璃相、FAP和榍石晶相组成;多孔生物玻璃陶瓷涂层由玻璃相、FAP和β－CaSiO3晶相组成;复合涂层能与骨组织产生骨性结合。     

钛合金高温防护陶瓷涂层的制备与性能

以磷酸二氢铝作为粘接剂,氧化镁与氧化锌作为固化剂,氧化铝与氮化硼作为填料,正硅酸四乙酯作为助剂制备出水性涂料,通过空气喷涂将涂料喷涂到TC18钛合金表面固化后制备出高温防护陶瓷涂层,并对涂层防护的钛合金基体进行了900℃条件下的高温氧化试验与抗热震试验。结果表明:高温氧化试验结束后整个TC18钛合金基体完全氧化,涂层涂覆试样保持完好,在900℃高温氧化环境中达到弱抗氧化性级别。陶瓷涂层历经60次空冷与水冷的抗热震性试验后陶瓷涂层保持宏观完整,未发生大面积脱落现象。     

金属材料表面制备玻璃涂层技术的研究进展

在金属材料表面上制备玻璃涂层,可以有效地提高材料表面性能,是一种具有广阔应用前景的表面处理技术.本文总结了金属表面玻璃涂层的研究现状,介绍热熔敷法、热喷涂法、溶胶-凝胶法、激光熔覆法制备玻璃涂层的研究成果,分析各种制备方法的优缺点,并展望了今后金属表面玻璃涂层的发展方向.     

碳结合碳纤维复合物用保护涂料

碳结合碳纤维复合物（CBCF）通过与熔融硅直接反应,在复合物表面得到一层碳化砖层并对其进行改进。随后,已渗透硅的CBCF材料用泥浆-浸渍工艺、用含钇和铝的硅质玻璃进行涂层。对玻璃热处理时就会产生一个玻璃-陶瓷层,因此就得到一个多层抗氧化和抗侵蚀保护系统。通过疆做技术和X-射线衍射测出了涂层的显微结构特征。受到控制的结晶过程中所产生的主要晶相有：玻璃状方英石、硅酸钇（Y2Si2O7,Keiviile,β形式）和莫来石。它们是具有抗氧化和抗侵蚀保护的SiC涂层的碳质复合物的优质陶瓷材料,这是因为它们的热膨胀系数（CTE）非常接近SiC的热膨胀系数。在1375℃热处理时,微裂纹有可能闭合,这是因为利用了玻璃一陶瓷中残余玻璃的粘性流,因此为了延长保护系统的使用寿命．我们对这些都进行了研究．     

在非水溶液体系中电泳沉积Ti6Al4V/BG/HA梯度涂层

本工作的目的是探索制备钛合金表面生物活性梯度涂层的新方法 ,提高涂层的结合强度及稳定性 .通过诱导羟基磷灰石 (HA)在生物玻璃 (BG)颗粒表面的结晶 ,改变了生物玻璃表面的带电特性 ;采用电泳沉积 (EPD)法 ,在非水溶液体系中实现了BG和HA在阴极Ti6Al4V基体上的共沉积 ,经烧结获得了生物活性梯度陶瓷涂层 ,得到了一种制备生物活性梯度陶瓷涂层的新工艺 .用XRD对涂层的相组成进行了定性分析 ,结果表明涂层由HA ,榍石和玻璃组成 ;采用粘结拉伸法测定的涂层与基体结合强度大于 18MPa,用SEM观察涂层表面及断面的形貌 ,可见涂层表面较为平整 ,没有明显的裂纹 ;涂层与基体结合紧密 ,且存在一明显的界面梯度区域 .     

HAP陶瓷涂层与金属密着界面的电镜观察

对采用类似涂搪烧成方法,分别以人工骨钛合金、不锈钢材料为基体研制掺生物玻璃的羟基磷灰石(MAP)陶瓷涂层生物复合材料的结合界面进行电镜观察,本文从微观结构证明:采用该方法制备的材料,能使HAP陶瓷涂层与金属具有良好的结合。     

在非水溶液体系中电泳沉积Ti6Al4V/BG/IIA梯度涂层

本工作的目的是探索制备钛合金表面生物活性梯度涂层的新方法,提高涂层的结构强度及稳定性,通过诱导羟基磷灰石（HA）在生物玻璃（BG）颗粒表面的结晶,改变了生物玻璃表面的带电特性;采用电泳沉积（EPD）法,大非水溶液体系中实现了BG和HA在阴极Ti6Al4V基体上的共沉积,经烧结获得了生物活性梯度陶瓷涂层,得到了一种制备生物活性梯度陶瓷涂层的新工艺,用XRD对涂层的相组成进行了定性分析,结果表明涂层由HA,榍石和玻璃组成;采用粘结拉伸法测定的涂层与基体结合强度大于18MPa,用SEM观察涂层表面及断面的形貌,可见涂层表面较为平整,没有明显的裂纹;涂层与基体结合紧密,且存在一明显的界面梯度区域。     

碳纤维增强碳复合材料高温抗氧化硅基陶瓷涂层的研究进展(英文)

碳纤维增强碳(carbon fiber reinforced carbon,C/C)复合材料抗氧化问题一直是国际材料界研究的热点。硅基陶瓷作为C/C复合材料抗氧化涂层,是目前研究最深入的涂层体系。综述了国内外近几年C/C复合材料高温抗氧化硅基陶瓷涂层的研究进展,总结了C/C复合材料高温抗氧化硅基陶瓷涂层的制备工艺和对已有工艺的改进方法,分析了硅基陶瓷涂层在高温空气中、燃烧环境中的氧化失效机理。结合硅基非氧化物陶瓷(SiC,Si3N4等)环境障碍涂层的发展,展望了C/C复合材料在复杂环境中抗氧化涂层的研究方向。     

复合氧化工艺对医用钛合金耐蚀性和耐磨性的影响

采用阳极氧化和热氧化相结合的复合氧化工艺对医用钛合金进行氧化处理,研究了氧化液的组成和热氧化温度对钛合金氧化膜表面形貌,耐蚀性和耐磨性能的影响。实验结果表明,复合氧化工艺可以提高钛合金表面的耐蚀性能和弹性模量,改善了钛合金的耐磨损性能。     

Influence of annealing temperature on microstructure evolution of TiAlSiN coating and its tribological behavior against Ti6Al4V alloys

TiAlSiN multicomponent coating, owing to its high hardness and excellent high temperature resistance, was widely used in the cutting field of difficult-to-cut materials such as titanium alloys. For machining titanium alloys, high temperature is easy to gather on the tool chips and deteriorate the cutting tools. Moreover, high temperature will also promote the microstructure evolution and make the wear mechanism more complex. In this paper, TiAlSiN coatings were deposited on cemented carbides and annealed at 400 °C, 600 °C and 800 °C respectively for 60 min in air, followed by reciprocating friction tests against Ti6Al4V counterparts. AFM, SEM, EDS and XPS were applied to investigate the microstructure evolution and tribological behavior of TiAlSiN coating after high temperature annealing. The results demonstrated that the oxidation resistance of TiN phase in TiAlSiN coating was worse than Si₃N₄ and AlN phases. These nitrides can be oxidized to TiO₂, SiO_x and AlO_x under 600 °C, and the depth of oxide layer was increased with the rising annealing temperature, resulting in the coarsened microstructure. The wear mechanisms of as-deposited TiAlSiN coating were oxidation wear and adhesion wear. With the rising annealing temperature, abrasive wear was gradually enhanced. For the TiAlSiN coating annealed at 800 °C, abrasive wear became the dominant wear mechanism.     

Coatings for improvement of high temperature corrosion resistance of porous alloys

Porous alloys are proposed as supports for the next generation solid oxide fuel cells. Their application lowers the price of the fuel cells, which will result in faster commercialization. However, they are prone to high temperature corrosion. So far, there is lack of methods, which can improve high temperature properties of porous alloys for SOFC applications. A method for improving corrosion resistance of porous alloys has been proposed and investigated here. In this work protective coatings are prepared by the infiltration of precursor solutions that contain Y cations. High temperature oxidation properties of the modified alloys are compared with non-modified samples by cyclic thermogravimetry, electron microscopy and X-ray diffractometry measurements. The infiltration of Y precursor into the porous alloy decreases the high temperature corrosion rate. This method can be used to improve long term properties of porous alloys applied for fuel cells supports.     

化学镀镍层封孔新工艺的研究

利用溶胶-凝胶法在化学镀镍层表面制备出TiO2、TiO2、-SiO2膜，研究了热处理温度和涂覆次数对涂层表面成分及其耐蚀性、抗氧化性和耐磨性的影响，结果表明，经四次涂覆后，TiO2、TiO2-SiO2溶胶-凝膜层具有很好的耐蚀性和抗高温氧化性，少量钼、铬元素的加入可提高TiO2溶胶-凝胶膜的耐磨性。     

Novel structured spark plasma sintered thermal barrier coatings with high strain tolerance and oxidation resistance

Titanium alloys play an important role in lightweight aircraft engines owing to their low densities and high specific strengths. However, an increase in the thrust-to-weight ratio causes the engine operating temperature to be much higher than the service temperature, which deteriorates the oxidation resistance and mechanical properties. In this study, yttria-partially stabilised zirconia (8YSZ)/NiCrAlY thermal barrier coatings (TBCs) with a bimodal structure were prepared on Ti–6Al–4V by using spark plasma sintering (SPS) to improve the service temperature. The distinctive bimodal structure possessed dense particle contacts and a uniform distribution of porous nanoparticles, resulting in higher strain tolerance, sintering resistance, and lower thermal conductivity. Therefore, the bimodal structure prepared by lowering the SPS preparation temperature increased the high-temperature service time of TBCs on titanium alloy. The ceramic top coating (TC) and bond coating (BC) were well connected after isothermal oxidation at 800 °C for 100 h. The TBCs only shed 6% of their surface area at high temperature and large-angle bending. In addition, the bimodal-structured TBCs effectively improved the oxidation resistance of the Ti–6Al–4V substrate. The Ti–6Al–4V substrate with bimodal-structured TBCs only gained 0.51 times the mass gained by the bare Ti–6Al–4V after 100 h of isothermal oxidation.     

Tribological properties of YSZ and YSZ/Ni-YSZ nanocomposite coatings prepared by electron beam physical vapour deposition

Metal-ceramic nanocomposite coatings have been applied to many industrial applications owing to their remarkable properties such as wear, corrosion and high temperature oxidation resistance than that of metals and alloys in high temperature environments. In this study, YSZ and Ni-YSZ nanocomposite coatings deposited by electron beam physical vapour deposition (EBPVD) for high temperature environments have been investigated. Initially friction and wear behaviour of YSZ coatings deposited at various substrate temperature were studied. Then the effect on wear response of Ni-YSZ nanocomposites with different Ni content were investigated using a ball-on-disc micro tribometer. The structural and tribochemical changes that occurred in the wear tracks of YSZ and Ni-YSZ coatings were investigated using field emission scanning electron microscopy and Raman spectroscopy. The results obtained on sliding wear and friction behaviour of these nanocomposite coatings suggest that 50 wt.% of Ni in YSZ nanocomposite provides good wear resistance behaviour than that of other coatings. Such an improvement in tribomechanical and wear performance of the nanocomposite coating could be attributed to the optimum amount of Ni which promotes the formation of NiO from Ni due to the frictional heat between nanocomposite coating and the sliding counter body in wear track as confirmed by Raman analysis.     

Preparation of TiC-Ti3AlC composite coated graphite flakes and their improved oxidation resistance

The weak oxidation resistance has severely hindered graphite from various high temperature applications, therefore in this paper a molten salt technique was proposed to prepare titanium aluminium carbide based coatings on graphite flakes to overcome this problem. The resultant TiC-Ti₃AlC coated graphite showed higher peak oxidation temperature (~?900?°C) than the uncoated one (700?°C), suggesting that the coatings will afford graphite with superior oxidation resistance. Such improvements can be largely ascribed to not only the homogenous and crack-free TiC-Ti₃AlC coatings and their resultant relicts of TiO₂ and Al₂O₃, but also the molten salt technique for preparing the coatings. Especially the molten salts offer fast dissolution/melting/dispersion of Ti/Al powders, rapid reaction with graphite in the salt melts, and homogenous growth of the carbide coatings on the surface of graphite flakes at as low temperatures as 950–1150?°C.     

医用钛合金耐蚀性涂层的研究进展

介绍了医用钛合金的应用前景,分析了其腐蚀机理,并简述了新型医用钛合金及其表面耐蚀性涂层的研究进展.通过加入不同含量的Mo、Nb、Pa、Zr、Ta等元素生成的各种耐蚀性涂层可以改善钛合金的耐蚀性能.     

Electroless Ni–P composite coatings

This review outlines the development of electroless Ni–P composite coatings. It highlights the method of formation, mechanism of particle incorporation, factors influencing particle incorporation, effect of particle incorporation on the structure, hardness, friction, wear and abrasion resistance, corrosion resistance, high temperature oxidation resistance of electroless Ni–P composite coatings as well as their applications. The improvement in surface properties offered by such composite coatings will have a significant impact on numerous industrial applications and in the future they will secure a more prominent place in the surface engineering of metals and alloys.     

等离子体喷涂生物陶瓷涂层

综合介绍了文献及中国科学院上海硅酸盐研究所在等离子体喷涂生物涂层方面的近期研究进展。羟基磷灰石涂层已在临床上获得应用,但使用效果仍然受其较低的结合强度和结晶度所制约。通过优化喷涂工艺和制备羟基磷灰石基复合涂层,可有效提高羟基磷灰石涂层的结合强度和结晶度。此外,为了获得综合性能优良的植入体材料,制备了多种新型的生物活性陶瓷涂层。纳米氧化钛涂层经合适工艺的后处理可具有良好的生物活性,由于其与钛合金基体有较高的结合强度,在体液环境下具有高稳定性和生物相容性,使纳米氧化钛涂层成为一种具有发展前景的植入体涂层候选材料。新型生物活性硅酸钙涂层具有良好的生物活性,与骨组织能形成有效结合。此外,对这些新型涂层的生物活性机制也做了必要的描述。