Tungsten Oxide Rare Earth Doping Step

Rare earth doping is a new method to improve the performance of tungsten oxide. It has a wide range of development prospects in the fields of manufacturing, industrial and other applications. The simple rare-earth doping can make the preparation process of tungsten oxide with good pressure-sensitive properties become simple, and the simplification of its phase structure can more easily analyze the physical mechanism of its electrical properties.

The rare earth doped tungsten oxide steps are:
Mixing: The specific process is to place the weighed raw materials in the grinding tank, select the right size agate ball into the grinding tank, and then pour the analytically pure ethanol into it, continue ball milling for 24 hours, and then dry it for use. .
Granulation: The ordinary glue and distilled water are mixed together in a ratio of 1:10, then slowly sprayed into the material, and then stirring the material with a spoon, the large particles gathered together are smashed separately. Then stir with a blender until the particles are evenly dispersed and the humidity is moderate.

Forming: The granulated material is placed in a selected mold, using a die with a diameter of 16 mm, the forming pressure is 20MPa, and the pressure is unidirectional.
Sintering: Sintering generally refers to the process of reducing the surface area of the aggregates of powder particles, reducing the porosity, increasing the contact area between particles, and increasing the mechanical strength under the effect of high temperature. This is the most critical process in the entire tungsten oxide ceramic manufacturing process. It directly affects the quality of the sample to a large extent.
The specific process of sintering is: heating → insulation → cooling. Insulation is to maintain the maximum temperature within the required time, to ensure that there is enough energy in the physical, chemical changes such as various reactions, transport and growth in tungsten oxide. The selected sintering temperature is 1100 oC and the holding time is 2 hours. Cooling is a process that drops from maximum temperature to room temperature. Obviously, many of the changes that occur during the pre-sintering period will be frozen during this process, which will have an important effect on the final properties of the tungsten oxide.

Post-treatment: Tungsten oxide must be surface treated after sintering. Because tungsten oxide is sintered well, the difference between the surface and the body components is often large, and the original surface must be ground to ensure the consistency of the internal and external components of the sample. Before the measurement of the electrical properties of the tungsten oxide, the tungsten oxide surface was coated with electrodes to reduce the contact resistance. Room temperature measurement uses In-Ga electrodes and Ag electrodes for high temperature measurement.

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