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August 2008
905-827-4171
Fixture Design for Vacuum Processing
vafurnace.gif Good fixturing and loading practices are essential elements in achieving proper heat treating results and long equipment life.

Fixture materials and design must be appropriate for the processing application. Maintenance of fixtures is equally important. The possibility of reactions between the workpieces and baskets or fixtures must also be considered. High temperature sintering of the workpieces to themselves or the fixtures can occur. Eutectic melting can also occur when certain chemical compositions come into contact at high temperature. Selection of a fixture material is influenced by cost, service environment and compatibility with the workpiece and furnace hearth. READ MORE
Temperature Uniformity Surveys
vafurnace.gif All furnace equipment used for heat treating should be properly instrumented and periodically tested for uniformity.

The temperature uniformity within the furnace must be regularly surveyed. The frequency of surveying is largely dependent on the type of equipment in use and its previous history in accuracy and reliability. Exact survey frequencies should be determined from applicable processing specifications. However, quarterly temperature uniformity surveys are fairly standard. The purpose of the uniformity survey is to determine the range of temperatures present at different locations in the furnace under normal operating conditions. A furnace is normally qualified through an initial comprehensive survey. READ MORE
Temperature Measurement in Vacuum Furnaces
vafurnace.gif In any heat treating cycle, there are two important considerations concerning temperature: the temperature of the furnace hot zone which is generating the heat input, and the temperature of the actual workload.

Heating by direct radiation, the main heating mechanism in vacuum, tends to be a slower process than other heating mechanisms such as convection or conduction. As a result, there are times in the heat treating cycle, particularly during heat up, when the load will be at a lower temperature than the furnace hot zone. This is known as temperature lag. READ MORE

 
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