Orton Ceramic Foundation / USA

標準型橫臥式熱膨脹分析儀 / Standard, Single Sample, Horizontal Dilatometers

Thermal Dilatometric Analysis (TDA), often called "dilatometry", measures the dimensional change of a material (ceramics, glasses, metals, composites, carbon/graphite, minerals, polymers, and others) as a function of temperature. This test determines both reversible and irreversible changes in length (expansion and shrinkage) during heating and cooling, and pinpoints where reactions occur that cause expansion or contraction. Samples are quickly and easily measured for determining firing ranges and firing schedules, measuring thermal expansion ranges for glaze fits, and measuring thermal expansion ranges for R&D, QC or product certification. Orton dilatometers are used for ASTM E-228 testing.

可測量線性膨脹係數 Coefficient of Thermal Expansion (CTE), 軟化點 softening point, 玻璃化轉變溫度 glass transition
temperature, 居禮溫度 curie point, 晶化轉變點 crystalline transformation, 相轉變 phase transition, 收縮 shrinkage,
翹曲 warping, 脹大 bloating, 燒結率 sintering rate, 等溫蠕變 isothermal creep, 應力鬆馳 stress relaxation.

The test results are a graph of the TDA signal (converted to percent length change) on the Y-axis plotted versus the sample temperature in °C on the X-axis. Sample graphs of enhanced output are shown below.

下載本目錄文件請使用電子文件程式 PDF
     The Dilatometer Brochure  PDF format (164 kb).

Computer Analysis

Every Orton dilatometer is supplied with the software to add to the user's PC in order to acquire, save and analyze the data generated by the dilatometer. The Orton Dilatometer Software is a Visual Basic executable routine written for Windows 95/98/2000/XP English language based personal computers. It can be used to monitor the dilatometer test in real time, or can be used to examine the test data after the run. The software imports the data through the RS232 interface, and stores it on the hard drive for immediate or post-testing analysis. The software enables the user to:

View the dilatometer data in a variety of presentations:

• Percent linear change (PLC) vs. temperature
• Percent linear change (PLC) vs. time
• First derivative of the percent linear change (DCE) vs. temperature
• First derivative of the percent linear change (DCE) vs. time
• Percent linear change (PLC) and first derivative of the percent linear change (DCE) vs. temperature
• Percent linear change (PLC) and first derivative of the percent linear change (DCE) vs. time

Perform a variety of analyses:

• Calculate the coefficient of thermal expansion (CTE) between specified temperatures, or a series of specified
  temperatures
• Calculate the average coefficient of thermal expansion from room temperature to a specified temperature at
  a specified temperature increment
• Determine transition temperature
• Determine softening temperature
• Locate alpha-beta quartz transition
• Export the data in a text file format for independent analysis or archiving purposes

      Metals MIL I-23011C Class 7

其他特殊用途膨脹分析儀
Other Orton Dilatometers

	Vertical
	2 Sample
	Multiple Sample
	Non-contact Laser
	Rapid turnaround
	Quench (metallurgical)

For larger samples, such as structural clay bodies, a vertical dilatometer is used. The sample is placed into the furnace and the vertical probe rod is lowered to contact the sample (as shown in the photo at the right). The furnace is heated according to the pre-programmed thermal cycle. As the sample temperature changes, the sample expands, pushing up on the probe rod, or shrinks, pulling away from the probe rod. The probe rod is vertically suspended and counterweighted so that gravity keeps it in constant contact with the sample. The probe rod transmits the amount of sample movement to the electronic displacement sensor located overhead and outside the furnace.

Orton also designs and manufactures other types of dilatometers, including vertical, multiple sample, metallurgical, quenching, laser, and special application systems.

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