Xiaojun JI
,
Tao HAN
,
Wenkang SHI
,
Guowei ZHANG
材料科学技术（英文）
Surface acoustic wave (SAW) devices play a significant role in signal processing, frequency control and sensing applications. In general, they cannot operate at elevated temperature. The new crystal of langasite provides possibility for surface acoustic wave devices applied at high temperature. This paper studies the SAW properties of single and doubly rotated cuts of LGS at high temperature. The calculated SAW properties of LGS are analyzed in space with aid of contour plots, and two promising SAW orientation regions at high temperature are presented. For some typical cuts and propagating directions within the two optimal regions, their SAW characteristics vs temperatures are discussed. Based on the experimental evidence in some literatures, the reliability of calculated results is verified.
关键词:
High-temperature
,
null
,
null
,
null
李俊峰
,
卢鹉
,
罗正平
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2016.01.012
以陶瓷前驱体树脂为成膜物,以过渡金属氧化物和硼化物为填料,采用空气喷涂工艺在镍基高温合金和C/C基材上制备出了高温散热性能好、抗热震性好的高温高辐射涂层,并用DSC-TG、光学显微镜和风洞对涂层性能进行表征.结果表明:该涂层室温～827℃发射率达到0.85 ～ 0.92,827℃～室温抗热震循环20次后涂层不剥离、不脱落;该涂层在290 kW/m2冷壁热流、300 s时长的风洞考核条件下,可将镍基高温合金基材温度从686℃降到646℃,降温40℃.
关键词:
陶瓷前驱体
,
高温
,
高辐射涂层
,
发射率
,
风洞
杜广报
,
白书欣
,
朱利安
,
张虹
,
叶益聪
宇航材料工艺
doi:10.12044/j.issn.1007-2330.2017.02.002
针对Ir涂层的应用背景,分析了目前Ir涂层存在的问题及其对涂层服役性能的影响,在此基础上综述了Ir涂层的三类主要改性技术,并对Ir涂层改性技术的发展进行了展望.
关键词:
Ir涂层
,
改性
,
高温
,
抗氧化性
