Electric field-assisted ceramic material sintering furnace and control method thereof

[0051] Example 1:

[0052] This embodiment provides a ceramic material sintering furnace assisted by an electric field, which includes a tube furnace 1 with a shell on the outside, and a time and furnace temperature control unit on the shell. The tube furnace can be realized through the time and furnace temperature control unit. According to the presetting of the heating program of the body, the prepared PZT ceramic powder is uniaxially pressed into a cylindrical shape, and the two ends are coated with platinum slurry for use. Put the PZT ceramic sample coated with platinum paste on the front end of the alumina ceramic tube 2 on one side, and a platinum sheet 6 is installed at the front end, and lightly stick the sample on the platinum sheet 6, and the platinum wire 7 passes through the ceramic tube 2 and the platinum sheet 6 connected, the other end stretches out the ceramic tube 2, the spring 8 is placed between the ceramic tube 2 and the support frame 51, one end is against the step of the ceramic tube 2, the other end is against the support frame 51, and the bottom of the support frame 51 has a belt The pulley 82 of lock buckle. After the sample is placed, slowly push the supporting frames 51 on both sides, and the elastic force of the spring 8 and the matching protrusion 22 and recess 23 at the front end of the ceramic tube 2 clamp the sample in the center and keep the electrodes in stable contact. Place an external circuit protection device 9 on the outside, connect to a suitable protection resistor 200Ω, connect to the data observation and recording module 4 on the right side of the external circuit protection device 9, and connect to the electric field application device 3 on the right side of the data observation device 9 , and then connect the two ends of the circuit connected in series with the platinum wires 7 protruding from the ceramic tubes 2 on both sides to complete the connection of the entire circuit.

[0053] During work, the setting of the heating program is completed through the time and temperature control unit 3 . Set the initial temperature as room temperature, and the heating rate as 10°C/min. The voltage and maximum current output parameters are set through the electric field application device 3, wherein the output voltage is 1000V, and the limit current is 100mA. After the setting is completed, the tube furnace 1 and the electric field application device 3 are started to realize the electric field assisted sintering of the PZT ceramic sample. Pay attention to the readings on the data observation and recording module 4 during sintering. When the furnace temperature is 500°C, the current rises rapidly to reach the limit current. Keep sintering in this state for 30s, and then close the sintering device. Figure 4 SEM photos of PZT prepared by sintering under this condition, it can be seen that the sample has achieved complete densification. Compared with the traditional sintering method, with the sintering furnace provided by the present invention, the sintering temperature of the PZT ceramic material is reduced by about 400°C, and the sintering time is reduced from several hours to 30s.

[0054] Example 2:

[0055] This embodiment provides a ceramic material sintering furnace assisted by an electric field. The difference between this embodiment and Embodiment 1 is that the sample to be processed is made of Al 2 o 3 For ceramic materials, the applied voltage is set to 1400V through the electric field applying device 3, and the final furnace temperature is 1400°C.

[0056] Figure 5 Al is prepared for sintering under this condition 2 o 3 From the SEM photo of the ceramic, it can be seen that the sample has been completely densified. Compared with the traditional sintering method, adopting the sintering furnace provided by the present invention, Al 2 o 3 The sintering temperature of the ceramic material is reduced by about 300°C, and the sintering time is reduced from several hours to 30s.

[0057] Example 3:

[0058] This embodiment provides a ceramic material sintering furnace assisted by an electric field. The difference between this embodiment and Embodiment 1 is that the sample to be processed is made of KNN ceramic material, and the applied voltage is set to 1400V by the electric field application device 3, and the final furnace temperature is 750°C.

[0059] Image 6 SEM photos of KNN ceramics prepared by sintering under this condition, it can be seen that the samples are completely densified. Compared with the traditional sintering method, with the sintering furnace provided by the present invention, the sintering temperature of the KNN ceramic material is reduced by about 300°C, and the sintering time is reduced from several hours to 30s.