Sensor system and methods for environmental sensing
A sensor and environmental technology, applied in the field of sensors for physical and physical and chemical sensing applications, can solve problems such as unbearable
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example 1
[0082] Example 1: Determination of high temperature resistance properties of sensor materials
[0083] In one example, the environmental resistance of the sensor material was tested using a cast iron sample by exposing the sample to molten highly reactive copper (Cu) in vacuum at a temperature of at least 1085°C. The composition of the composite material (by volume percentage) is 66.9% SiC, 8.1% (Mo, W)5 Si 3 C and (Mo, W) 5 Si 3 , 6.9% (Mo, W) Si 2 and 18.1% volumetric porosity. Novotnyi phase (Mo, W) 5 Si 3 C and (Mo, W) 5 Si 3 They were indistinguishable using scanning electron microscopy, and therefore they were included together when reporting components. (Mo, W) 5 Si 3 C and (Mo, W) 5 Si 3 The atomic ratio of tungsten to molybdenum is 0.28; and (Mo, W)Si 2 The atomic ratio of tungsten to molybdenum is 0.19. The silicides are all silicon stoichiometric.
[0084] In a control set, uncoated cast iron parts were exposed to molten copper (74), as in Figure 7B...
example 2
[0085] Example 2: Determination of thermochemical resistance of sensor materials in gasifiers
[0086] In another example, Hexalloy TM (commercial silicon carbide) parts were used as controls and were left uncoated (as in Figure 8 shown in ). The part is exposed in vacuum to the residue at a temperature in the range of approximately 1400°C to 1500°C. The residue is in liquid form at these high temperatures. Hexalloy TM The parts are then cooled to room temperature. The surface of the part shows a small wetting angle. Therefore, in a thermochemical environment, the residue (76) (in Figure 8 Medium) found bonding and easy in Hexalloy TM spread over the surface of the part, thereby corroding the part.
[0087] In order to determine the sensor material properties in a similar environment, two different sample parts were tested. One was made from a bulk slab of refractory silicon carbide composite material, with a composition similar to that described in Example 1 ( Fi...
example 3
[0088] Example 3: Resistive Sensor Response to Temperature Change
[0089] The sensor system is designed to include a sensor comprising a resistive sensor material, a pair of electrodes, a substrate and a voltage measuring device. The resistive sensor material used was a refractory silicon carbide composite material with the same composition as mentioned in Example 1. For composite sensors, platinum wire is used for the circuit. Platinum wires are attached to both sides of the sensor. Platinum paste is used to establish electrical contact between the platinum wire and the refractory silicon carbide material. The slurry is heat treated to sinter the platinum in an inert atmosphere, yielding the figure 1 The setup for resistance measurements is shown in . Two additional platinum wires are attached to one side of the sensor. One of the wires is attached to a power supply and the other wire is attached to a voltmeter for monitoring the voltage across the sensor. The opposite...
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