高温体声波谐振器的组装与互连技术

IF 0.8 Q4 INSTRUMENTS & INSTRUMENTATION Journal of Sensors and Sensor Systems Pub Date : 2022-03-23 DOI:10.5194/jsss-11-83-2022
F. Kohler, M. Farina, M. Schulz, H. Fritze, J. Wilde
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引用次数: 4

摘要

摘要基于压电单晶的传感器即使在恶劣的环境条件下也能工作。除了传感器元件外,封装技术对传感器的性能也至关重要。本文提出了一种适合高温应用的ca3taga3si2o14 (CTGS)谐振器的组装和互连技术概念,作为未来传感器组装的平台。这里描述的概念已经作为温度传感器进行了功能测试(Schulz et al., 2021)。这个概念包括一个蓝宝石底座,一个外壳盖和一个由氧化铝(Al2O3)制成的间隔。衬底用铂金属化制成薄膜和厚膜技术。陶瓷元件用玻璃焊料熔合。谐振器与导电轨道的连接是通过25 μ m铂线的热超声键合实现的。首先,在随后的高温下的电气测试之前,必须研究金属化的稳定性。扩散过程在此温度范围内起主要作用,层的稳定性是后续研究的必要条件。分析了一组合适的键合参数和热负荷前后铂键的强度。采用剪切试验对玻璃焊料熔接陶瓷材料热老化后的质量进行了评价。蓝宝石和玻璃焊料的介电性能,如隔离电阻,相对介电常数,以及在高温下的损耗因子评估使用数字间结构。损耗系数是在裸露的指间结构和涂有玻璃焊料的样品上测量的,以估计其在1000°C下的导电性能。传感器外壳的陶瓷盖由高温稳定的玻璃焊料连接。由于铂导体通过这种玻璃焊料连接,因此玻璃焊料的导电性在高温下具有特征。此外,通过氦气泄漏试验验证了组件的密封性。这些研究是实现适合在极端温度条件下可靠运行的组装和互连技术的基础。该封装技术还为能够承受高温载荷的压力或化学传感器提供了进一步的可能性。
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Assembly and interconnection technology for high-temperature bulk acoustic wave resonators
Abstract. A sensor based on a piezoelectric single crystal enables operation even under harsh environmental conditions. In addition to the sensor element, the packaging technology is crucial for sensor performance. In this paper, a suitable assembly and interconnection technology concept of Ca3TaGa3Si2O14 (CTGS) resonators for high-temperature applications is presented as a platform for future sensor assemblies. The concept described here has already been functionally tested as a temperature sensor (Schulz et al., 2021). The concept includes a sapphire base plate, a housing lid, and a spacer made from aluminium oxide (Al2O3). The substrate is metallised with platinum manufactured into thin film and thick film technology. The ceramic components are fused with glass solder. The connection of the resonator to the conductive tracks is realised by thermosonic bonding with 25 µm platinum wire. Initially, the stability of the metallisation must be investigated before subsequent electrical testing under high temperature. Diffusion processes play a major role in this temperature range, and the stability of the layer is a necessary condition for subsequent investigations. A suitable set of bonding parameters and the strength of the platinum bonds prior to and after thermal load is analysed. Shear tests are used to evaluate the quality of the ceramic materials fused with glass solder after thermal ageing. The dielectrical properties of sapphire and glass solder such as the isolation resistance, the relative permittivity, and the loss factor at high temperatures are evaluated using interdigital structures. The loss factor is measured on both bare interdigital structures and the samples coated with glass solder to make an estimation about the conductive behaviour up to 1000 ∘C. A ceramic lid for the sensor housing is attached by a high-temperature stable glass solder. Since platinum conductors are fed through this glass solder connection, the electrical conductivity of the glass solder is characterised at high temperature. Furthermore, the hermeticity of the assemblies is verified by means of helium leakage tests. These investigations are the basis for the implementation of an assembly and interconnection technology that is suitable for reliable operation under extreme temperature conditions. The packaging technology also offers further possibilities for pressure or chemical sensors that can withstand high-temperature loads.
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来源期刊
Journal of Sensors and Sensor Systems
Journal of Sensors and Sensor Systems INSTRUMENTS & INSTRUMENTATION-
CiteScore
2.30
自引率
10.00%
发文量
26
审稿时长
23 weeks
期刊介绍: Journal of Sensors and Sensor Systems (JSSS) is an international open-access journal dedicated to science, application, and advancement of sensors and sensors as part of measurement systems. The emphasis is on sensor principles and phenomena, measuring systems, sensor technologies, and applications. The goal of JSSS is to provide a platform for scientists and professionals in academia – as well as for developers, engineers, and users – to discuss new developments and advancements in sensors and sensor systems.
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