Instrumentation for automated and quantitative low temperature compaction and sintering
Instrumentation for automated and quantitative low temperature compaction and sintering
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DOI：
10.1063/1.5094040
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发表时间：
2019-05-01
影响因子：
1.6
通讯作者：
Maria, Jon-Paul
中科院分区：
文献类型：
--
作者：
Floyd, Richard;Lowum, Sarah;Maria, Jon-Paul
本报告描述了一种半自动单轴压力机的设计、操作和功能，该压力机具有压板位移的原位测量，旨在促进、理解和改善常规金属模具中颗粒材料在适度温度下的压实和致密性。虽然不限于一种实现，但该仪器特别适合研究冷烧结。该仪器与扩张法和量热法有相似之处，前者能够监测颗粒压实，后者能够通过摩尔体积特征监测相变。根据这些相似之处，我们把这种装置称为烧结仪。这种自动化的一个关键好处是一种新的能力，可以在恒定的压力下进行无限期的无人实验，同时收集定量数据。我们演示了使用该仪器的致密剖面计算（即sintegram），包括说明金属模具热膨胀背景的方法。提供了一组示例，其中这种稳定和长期的数据收集允许人们识别在冷烧结期间发生的致密化机制和相变，这将是非常耗时的，或者不可能使用传统的手动压力机提取。由AIP出版社授权出版。
This report describes the design, operation, and capabilities of a semiautomated uniaxial press with in situ measurement of platen displacements designed to facilitate, understand, and improve compaction and densification of particulate materials contained in conventional metal dies under modest temperatures. While not exclusive to one implementation, the instrumentation is particularly well-suited to study cold sintering. The instrumentation shares similarities to dilatometry, given the ability to monitor pellet compaction, and calorimetry, given the ability to monitor phase transitions by their molar volume signatures. Pursuant to these similarities, we refer to this device as a sinterometer. A critical benefit to this automation is a new ability to conduct experiments unattended for indefinite amounts of time under constant pressure while collecting quantitative data. We demonstrate densification profile computation (i.e., sintegram) using this instrument, including methods to account for the thermal expansion background of the metal die. A set of examples are provided where this stable and long-term data collection allows one to identify densification mechanisms and phase transformations that occur during cold sintering, which would be extremely time consuming, or impossible, to extract using a conventional, manual press. Published under license by AIP Publishing.