厚膜片式电阻器中的铅

厚膜片式电阻器产品使用的电子浆料包括有：背电极浆料、面电极浆料、电阻浆料、一次玻璃浆料、二次保护浆料、标记浆料、端电极浆料。厚膜片式电阻器产品中的铅全部含在电子浆料中，而在所有膜层中，铅又主要含在电阻体的玻璃粉中。因此，厚膜电阻器产品中的铅适用欧盟豁免条款。 本文从材料成分及产品结构的氟度浅析了厚膜电阻器产品中的铅及如何降低产品中铅的含量。     

国内厚膜电子浆料的发展与应用

介绍了厚膜电子浆料发展概况及主要厂家,列出了目前国内较流行的２０种厚膜浆料产品的主要性能指标（如：ＲＳ、α、ＳＴＯＬ、ＣＲＶ、ＥＳＤ、环境稳定性、激光稳定性等）、用途以及配套浆料。指出了国内厚膜电子浆料工业与国外的差距,提出了促进中国厚膜电子浆料工业发展的建议     

厚膜电阻浆料的研究现状与发展趋势

针对厚膜电阻浆料的研究现状,探讨厚膜电阻浆料中功能相的种类和粒度,玻璃相、有机载体的成分及含量等因素对厚膜电阻浆料的印刷性能和电性能的影响,简述了添加剂的种类对厚膜电阻的电导率等电性能的影响。因此,厚膜电阻浆料的性能参数是各因素相互作用的结果,通过改变各组分的成分、含量等,获得高性能厚膜电阻浆料配方。     

Fe_3Si基厚膜电阻的制备与电阻特性研究

采用传统固相合成法制备Fe3Si粉体,用作厚膜电阻的功能相,并用玻璃粉作为无机粘接相制备Fe3Si基厚膜电阻浆料。运用正交试验方法研究了浆料中玻璃粉含量、固含量对Fe3Si基厚膜电阻电学性能的影响。结果表明：浆料中粉料与有机载体的比例对其方阻影响最大,并且当浆料中固含量为69%wt~81%wt时,厚膜电阻的方阻变化范围为37KΩ/□~200KΩ/□;当固含量为75wt%、玻璃粉含量为45%时厚膜电阻的方阻最小。     

厚膜应变电阻的导电机理研究

制备了不同表面电阻率的Ｒｕ基厚膜应变电阻浆料,研究了厚膜应变电阻的表面电阻率与电阻应变系数之间的关系,并对其导电机理与特性进行了分析。     

LTCC基板厚膜电阻的常温稳定性

目前国内尚缺乏与ＬＴＣＣ相配套的厚膜电阻浆料。实验证明，厚膜电阻浆料的导电相、玻璃相及添加剂等对ＬＴＣＣ基板表面厚膜电阻在常温下的稳定性有一定影响。厚膜电阻浆料的膨胀系数随其导电相、玻璃相及添加剂的组分的变化而变化。当厚膜电阻浆料的热膨胀系数与ＬＴＣＣ基板的热膨胀系数之差异大到一定程度时，厚膜电阻在常温下的稳定性就会受到影响。Ｘ射线衍射图谱说明，厚膜电阻与ＬＴＣＣ基板之间生成的方石英相会降低厚膜电阻在常温下的稳定性。     

国外电子浆料最新发展概况

本文概述国外电子(导体、电阻、介质)浆料的最新发展,包括各种厚膜浆料,树脂酸盐浆料方面的新产品、新材料及新技术。     

《厚膜电子浆料论文集》内容简介

<正>《厚膜电子浆料论文集》收录了原昆明贵金属研究所研究员、厚膜电子浆料专家谭富彬先生的已发表论文23篇、未发表论文9篇、国家发明专利说明书10项(已授权9项)。共计265页,大约四十多万字。本论文集是作者从参加工作至今致力于贵金属和贱金属电子浆料研发工作的总结,多种贵金属粉末不同规格的制各,含铅玻璃无铅玻璃的熔制,热塑性有机载体及热固性有机载体的配制与合成,无论室温烘干(或固化),直至950℃高温烧结浆料,都收入论文集中。还有各种金属粉末、电子浆料及在电子元件中应用性能考核、测试方法,都一一有叙述。作者对电子浆料的     

氧化铍基板厚膜多层电路工艺研究

氧化铍基板在大功率电路领域广泛应用。本文对氧化铝基板用厚膜多层浆料体系在氧化铍基板上的匹配性进行研究。重点对导体的附着力、焊接性能进行了对比实验。研究结果显示氧化铝基板用厚膜多层浆料体系适用于氧化铍基板上。     

《厚膜电子浆料论文集》内容简介

<正>《厚膜电子浆料论文集》收录了原昆明贵金属研究所研究员、厚膜电子浆料专家谭富彬先生的已发表论文23篇、未发表论文9篇、国家发明专利说明书10项(已授权9项)。共计265页,大约四十多万字。本论文集是作者从参加工作至今致力于贵金属和贱金属电子浆料研发工作的总结,多种贵金属粉末不同规格的制备,含铅玻璃无铅玻璃的熔制,热塑性有机载体及热固性有机载体的配制与合成,无论室温烘干(或固化),直至950℃高温烧结浆料,都收入论文集中。还有各种金属粉末、电子浆料及在电子元件中应用性     

A new photoimageable platinum conductor

A new thick-film photoimageable platinum paste has been elaborated. The paste is less sensitive to the visible light. The resolution line/space 20/30 μm is achievable. The application of the elaborated paste to produce heaters is demonstrated. The stability of the heaters has been evaluated.     

304不锈钢基片用绝缘介质浆料的研制

选用BaO-Al2O3-SiO2体系微晶玻璃为主要成分,研制出适用于304不锈钢基片的介质浆料。通过丝网印刷、烘干和烧结,能够为304不锈钢基片提供可靠的介质层。介质层厚度达到70 mm以上时,其击穿电压不低于2 100 V,完全满足大功率厚膜电路对基片绝缘性能的要求。     

A reliability study of the lead-free solder connections of miniature chip components on hybrid circuits

The results of the influence of lead-free solder paste, design and process parameters on the attachment reliability of chip surface-mounted components (SMCs) on thick-film conductor pads are presented. The purpose of the investigation was to compare the quality of the soldered joints made with new solder pastes that do not contain lead with joints soldered with standard SnPb solders. The miniature zero-ohm chip resistors were soldered with selected lead-free solder pastes. The visual appearance of the solder joint according to the standards of lead-free soldered components was compared with components soldered with SnPb solders. On the test sample with soldered chip resistors connected in series, the solder-joint resistance was measured before and after temperature cycling. On the same test sample the solder-joint resistance changes were measured with impedance spectroscopy. After temperature cycling the damaged samples were analysed with SEM and EDS. The reliability test results after temperature cycling indicate two lead-free solder pastes that are the most convenient for chip-component soldering on thick-film conductor pads with the reliability of the joints being equal or better than solder joints with Pb-containing solder paste.     

A study of binders for the thick-film cathodes of DC-type plasmadisplay panels

This paper reports work done on developing binders for thick-film cathodes used in DC-type plasma display panels (PDP's). Instead of the conventional lead glass binder, this paper proposes a new liquid binder consisting of a liquid that can be mixed with a fine powder to form a paste. This paste can be baked in an irreversible process to form a solid that is highly resistant to both heating and reduction. Of the possible candidates, the partially hydrolyzed condensate of tetraethoxysilane (having an average degree of polymerization of 6) was selected to be used as a post-sintering binder for SiO₂. By using this binder in the manufacture of thick-film Ca_0.2La _0.8CrO₃ cathodes, the deterioration of the electrical characteristics of the color PDP's and the changing composition of the gas will slow, leading to longer product lifetime. MgO, ITO, and SnO₂ prepared using similar methods also produced potent binders. Thus some liquid binders are promising for application as the binder for thick-film cathodes used in DC-type PDP     

厚膜镍导电浆料研究

研究了厚膜镍导电浆料的制备及其烧结工艺,讨论了浆料中玻璃粉含量、烧结温度、保温时间及烧结气氛对烧结膜的附着力、方阻和可焊性的影响。结果表明:镍粉与玻璃粉的相对质量比 100/8 的厚膜镍导电浆料,在烧结温 度 750℃、保温时间 10~15 min 并有氮气保护的低氧分压烧结气氛时,可获得具有良好附着力、导电性和可焊性的膜层。     

Laser sintering of thick-film PTC thermistor paste deposited by micro-pen direct-write technology

In this paper, laser sintering has been used to process thermal sensitive material deposited by micro-pen direct-write technology. Lines of thick-film PTC thermistor paste were deposited by micro-pen direct-write technology and irradiated by a continuous-wave laser with varied power density and scanning speed. Line widths, sheet resistivities and temperature coefficients of resistivity were measured as a function of laser power density, scanning speed, coating thickness and overlapped value. The mechanism of laser sintering thermistor paste was discussed. Laser sintering enabled finer thermistor lines to overcome the resolution limitation of micro-pen deposition without the use of any high temperature post processing. The thermistors exhibited excellent electrical performance and resistance tolerance equivalent to traditional oven-fired electronic paste.     

叠层式片状电感器的设计

采用铁氧体材料和多层厚膜印刷技术，把铁氧体膜片和导电浆料相间印刷、叠合起来，经过热压、切割，烧制成一体化的闭磁路螺旋管状磁芯线圈，具有矩形微型、封闭磁路、独石结构的特点。     

Stability of miniaturized non-trimmed thick- and thin-film resistors

This paper is focused on reliability tests of non-trimmed miniaturized thin-film and thick-film resistors. Thick-film resistors are screen printed by polymer paste on LTCC (Low Temperature Co-fired Ceramic) substrate by two different approaches. Nonstandard precise screen printing process provide tolerance of resistivity less than 5% and thus further trimming is not necessary. OhmegaPly material with Nickel Phosphorous (NiP) metal alloy is used for thin-film resistors fabricated by subtractive process. Miniaturized resistors have dimensions 0.5 × 0.5 mm, and thus 1 square, with thickness 1 μm for thin-film and 20 μm for thick-film resistors. Stability of miniaturized resistors were tested by humidity test, thermal shocks, long-term thermal ageing, direct current stress, current pulses and simulation of soldering process using VPS (Vapour Phase Soldering). Resistivity of resistors is measured by four wire method before and after each set of test and relative change of resistivity is plotted in graphs. Influence of every test on each type of resistor is analysed.     

活性钎焊电子浆料流变性能及丝印质量的研究

研究了固含量及有机载体对电子浆料流变性能及丝网印刷质量的影响。采用流变仪测量钎焊电子浆料的黏度和触变性,并结合丝印后形貌特征,通过优化电子浆料的配方来改善丝印质量,对后续烧结过程形成性能优良的陶瓷覆铜板三明治结构具有很好的指导意义。获得了优化的浆料配方为:固含量为质量分数89%,有机载体成分质量组成为:丙二醇苯醚溶剂93.53%,乙基纤维素粘结剂5.97%及LD-9108型流平剂0.5%。获得的浆料黏度为46.039 Pa·s,触变指数为2.6136。     

New conductive thick-film paste based on silver nanopowder for high power and high temperature applications

A new thick-film material for screen-printing technology, based on nanoscale silver powders with the particle size distribution 5-55 nm is presented. Silver nanopowder used for paste preparation was elaborated by the authors. The compatibility of investigated paste was proven with alumina, silicon, Kapton foil and glass. The main advantage of this paste is sinterability at much lower temperatures (around 300 °C) compared to pastes obtained from micro-powders (650-850 °C). The thicknesses of obtained layers are 2-3 μm. The elaborated layers are dense and well sintered, exhibit good adhesion to all above mentioned substrates and low resistivity as well as very good resistance to high power and elevated temperatures. The results of loading the layers deposited on alumina substrates with high current and exposed to high temperature are presented as well.