TA仪器 Discovery差示扫描量热仪

Thermo-analytical experiments were used to characterize prepared Al?Mg and Al?Ti powders. Ignition temperatures for the Al?Mg powders vary from approximately 860 to 1060 K for the range of heating rates covered in the present ignition experiments. Kinetic correlations using Kissinger analysis were made to identify the reactions that may cause or contribute to ignition. Ignition for both Al?Mg and Al?Ti powders is associated with low-temperature, sub-solidus reactions.

本文运用热分析分析热塑性材料的物理性质。热分析是一系列的传统测量技术用于确定材料特性随温度的变化的技术。对两个工程热塑性塑料的短期和长期的物理性质研究的实验结果表明，热分析对描述热塑性材料的物理性质很有家价值。

Differential Scanning Calorimetry (DSC) is used to measure heat flow into or out of a sample as it is exposed to a controlled thermal profile. DSC provides both qualitative and quantitative information about material transitions such as the glass transition, crystallization, curing, melting, and decomposition. For some of these transitions, DSC can provide not only the temperature at which the transition (reaction) occurs and how much total heat is involved, but DSC can also provide valuable information about the rate (kinetics) of reaction. Furthermore, with the advent of easy-touse computer based data analysis programs, the ability to obtain such kinetic information has become more practical.?

Most military’s greases are formulated for use in severe service environments and multipurpose applications. To meet these requirements, the specifications usually require a wide operational-temperature range; excellent water and storage stability; good shear and oxidation stability; good antiwear and load carrying capacity; and rust and corrosion protection. These physical and chemical properties can change during storage and use. Most of these changes are interrelated and can eventually lead to lubrication failure.?

The simple yet highly sophisticatd character of these instruments has a major drawback: their simplicity significantly increases the potential foor misinterpreting experimental results.

五种热分析技术（DSC，调制DSC，TMA，DMA及DEA）是用来描述非晶形聚合物的玻璃化转变温度（Tg）的。每一种热分析技术都用在检测基于玻璃化转变过程中不同材料特性改变的Tg。因此，不同技术检测Tg的相对灵敏度取决于材料的性质以及作为实验变量，如加热速率等。本次研究比较了采用五种常见的热技术检测典型的无定形热塑性材料得到的Tg信息。结果表明可能出现的问题的类型。

Modulated thermomechanical analysis is shown to be a useful tool for determining thermodynamic and kinetic, reversing and nonreversing length changes in materials when these thermally induced events take place simultaneously. This ability to separate thermodynamic from kinetic events aids in the interpretation of the thermal curve, measures expansion and contraction taking place at the same time and provides a more accurate estimation of the glass transition temperature than the softening temperature. MTMA may have applications in other measurements where thermodynamic and kinetic length changes occur simultaneously. Such examples may include the softening of organic or inorganic glasses, heat set films and fibers, and shape memory alloys.

Modulated DSC is a powerful tool for materials characterization. Like any other precision technique, failure to use the optimum experimental conditions can result in sub-par performance. Following the suggestions listed in this paper should help you to design your MDSC experiment so that you derive the highest quality data.