共查询到20条相似文献,搜索用时 281 毫秒
1.
分析了通信线缆用YH-4热熔胶组成原料的性能和作用,找出影响耐环境高温性能的主要原因,并对新研制出的耐环境高温性能YH-5热熔胶作了一些分析和探讨。 相似文献
2.
本文叙述了共聚尼龙为主体试制成功的高强热熔胶,其胶接铝合金、钢,剪切强度分别为18.0MPa和大于20.0MPa,有优异韧性和较好耐介质性能,综合性能已达美国、日本同类产品水平,该胶已通过电子工业部部级鉴定。 相似文献
3.
本文研究了聚酰亚胺钝化工艺及其在大功率台面器件中的应用.实验结果表明,采用聚酰亚胺膜代替以往的SiO_2膜钝化,不仅提高了器件耐严酷环境的能力,而且有助于改善器件的高温性能. 相似文献
4.
5.
复合平滑铝套电缆在结构设计、机械性能、安装敷设等方面均有较大的技术优势。针对传统防腐涂覆用沥青材料的黏结性不足,展开了复合平滑铝套电缆防腐-黏结用热熔胶的研制。以聚氨酯和乙烯-醋酸乙烯酯共聚物(EVA)为基体材料,通过改性设计开发了两种专用高黏结热固性热熔胶。采用防腐试验和剥离强度试验验证了聚氨酯高黏结热熔胶和EVA高黏结热熔胶的防腐性能和黏结性能。相较之下,EVA高黏结热熔胶的黏结性能更优,其可使复合平滑铝套与外护套黏结成整体,不易脱开,形成复合护套,确保复合平滑铝套电缆与皱纹铝套电缆一样满足标准对高压电缆弯曲半径的要求,且弯曲后表面平整,不会产生弓起现象,电缆运行更为安全可靠。 相似文献
6.
开发了一种在多芯光纤阵列(FA)固化胶中添加适当比例的纳米石英粉末的新工艺,有效提高了平面光波导(PLC)分路器产品的耐环境性能,使其可通过Telcordia标准中高温高湿环境试验。该新工艺不增加生产成本,不影响生产效率,但可大大提高产品的核心竞争力。 相似文献
7.
为满足航空航天某工程应用的特殊需要,研制了耐400℃高温电缆。该电缆的长期允许工作温度为-55~400℃,同时具有柔软、外径小、耐电弧、耐低温、耐霉菌、耐盐雾、耐湿热等特性,适用于航空航天环境的信号传输。 相似文献
8.
9.
10.
11.
本文研究了引上法高温晶体生长期间热腔的热耗散。在晶体生长过程中,辐射引起的热耗散减小,减小的速率主要由晶体对熔体热辐射的吸收系数决定。对流引起的热耗散随晶体长度增加而增加。热耗散的变化引起输入功率,热腔质热传递的变化,不利于晶体生长。通过调节对流气体的压力,可以改变对流引起的热耗散,从而改变液面上纵向温度梯度。 相似文献
12.
Ivanova L. D. Granatkina Yu. V. Malchev A. G. Nikhezina I. Yu. Emel’yanov M. V. 《Semiconductors》2019,53(5):652-656
Semiconductors - p-type Bi0.5Sb1.5Te3 solid solutions prepared by hot pressing and the extrusion of powders prepared by rapid melt crystallization methods such as melt spinning and melt... 相似文献
13.
Alona Shagan Wei Zhang Manisha Mehta Shira Levi Daniel S. Kohane Boaz Mizrahi 《Advanced functional materials》2020,30(18)
Tissue bioadhesives are widely used in dermatology, surgery rooms, and in the field. Despite their advantages over sutures and staples, currently available tissue glues are limited by their mechanical properties and toxicity. Here, a new approach is described for wound closure that is based on a biocompatible, low melting point four‐armed N‐hydroxy succinimide‐modified polycaprolactone (star‐PCL‐NHS). Star‐PCL‐NHS is inserted into a hot melt glue gun, melts upon minimal pressure, and is extruded directly onto the wound, where it solidifies, bonding strongly with both edges of the wound. Changes in molecular weight allow control of adhesive strength, melting point, and elasticity properties. In vitro and in vivo evaluations confirm the biocompatibility of this system. The straightforward synthetic scheme and the simple delivery method, combined with the desirable mechanical properties, tunability, and tissue compatibility, are desirable traits in wound management. 相似文献
14.
15.
16.
17.
18.
烧结气氛、烧结温度、升降温速率等是陶瓷熔封工艺的必要条件,但导电胶在一定温度下受热分解,释放出的气体量的多少也是影响陶瓷熔封工艺的重要因素。因此,增加预烘工艺,改变导电胶组分,都可以在封盖过程中最大限度地减少导电胶中气体量的排放。同时,由于高温下气体过于集中,会导致器件泄漏。而芯片表面积及厚度不同,对管壳内腔体气流运行阻碍程度也不同,其中芯片厚度对腔体内气流阻滞作用特别明显。文章介绍了导电胶以及芯片厚度对黑瓷熔封工艺的影响,并对其应用进行了研究。 相似文献
19.
20.
《Materials Science in Semiconductor Processing》2002,5(4-5):347-351
The increase of diameter in the silicon single crystal growth from 200 to 300 mm for industrial application, and to 400 or 450 mm for research, respectively, has triggered off the development of numerous new technologies like crystal-growth-supporting systems, low-power hot zones, high strength of static magnetic fields and new quartzglas qualities. At Wacker Siltronic, new kinds of magnetic fields have been developed for 300 mm CZ growth. In this paper, the results of dynamic and combined (static and alternating) magnetic fields are discussed. Instead of buoyancy-driven convection, a magnetic-field-controlled melt flow has been obtained in large melt volumes. The crucible wall temperature and, in turn, the quartzglas corrosion has been reduced. Furthermore, the application of the magnetic fields allows the control of oxygen in a wide range. 相似文献