阅读说明：本技术 一种ito靶材坯体干燥脱脂装置及干燥脱脂方法 (ITO target blank drying and degreasing device and method ) 是由 黄田奇 张科 李康 *** 于 2020-06-03 设计创作，主要内容包括：本发明提供了一种ITO靶材坯体干燥脱脂装置及干燥脱脂方法,属于靶坯干燥领域。本发明提供的装置,利用了微波加热器和红外加热设备,使用了微波干燥和红外干燥混合干燥的方法,提高干燥的速率；横向移动导轨使靶坯在干燥过程中可以横向往复匀速运动,从而达到均匀干燥的目的,避免了微波干燥或红外干燥不均匀导致靶坯开裂的情况；且本发明所提供的装置是干燥脱脂一体炉,在同一个炉子可以同时完成干燥和脱脂两道工艺,简化了工艺,节省了工厂场地设备的投入。(The invention provides an ITO target blank drying and degreasing device and method, and belongs to the field of target blank drying. The device provided by the invention utilizes the microwave heater and the infrared heating equipment, and adopts a method of mixing and drying microwave drying and infrared drying, so that the drying speed is improved; the guide rail is transversely moved to ensure that the target blank can transversely reciprocate at a constant speed in the drying process, so that the aim of uniform drying is fulfilled, and the condition that the target blank is cracked due to nonuniform microwave drying or infrared drying is avoided; the device provided by the invention is a drying and degreasing integrated furnace, and can finish two processes of drying and degreasing simultaneously in the same furnace, thereby simplifying the process and saving the investment of factory site equipment.)

1. An ITO target blank drying and degreasing device is characterized by comprising a control console, oxygen supply equipment, a microwave generator, a connecting waveguide, a microwave heater, infrared heating equipment, a transverse moving guide rail and a backing plate,

the connecting waveguide tube, the microwave heater, the infrared heating equipment, the transverse moving guide rail and the base plate are positioned in a closed container with an opening, and the console, the oxygen supply equipment and the microwave generator are positioned outside the closed container with the opening;

the microwave generator is connected with the microwave heater through a connecting waveguide tube;

the base plate is positioned on the surface of the transverse moving guide rail; the base plate is a dry base plate or a degreasing base plate;

the microwave heater and the infrared heating device are arranged above the transverse moving guide rail.

2. The ITO target blank drying and degreasing device of claim 1, wherein the degreasing backing plate comprises an upper plate, a lower plate and a backing ball, and the backing ball is positioned between the upper plate and the lower plate and can rotate.

3. The drying and degreasing device for the ITO target blank according to claim 1 or 2, wherein the drying pad is made of gypsum, and the degreasing pad is made of resin.

4. The drying and degreasing device for the ITO target blank according to claim 2, wherein the material of the pad ball is high-temperature-resistant ceramic.

5. The ITO target blank drying and degreasing device of claim 4, wherein the material of the spacer balls is zirconia ceramic.

6. The drying and degreasing device for the ITO target blank according to claim 1, wherein the infrared heating equipment comprises an infrared heating lamp bank and an infrared thermometer.

7. An ITO target blank drying and degreasing method is characterized in that the ITO target blank drying and degreasing device of any one of claims 1 to 6 is used, and comprises the following steps:

placing the ITO target blank formed by grouting on a drying base plate, loading the ITO target blank into the closed container, starting a microwave generator and a microwave heater, starting a transverse moving guide rail at the same time, and performing microwave drying to obtain a blank dried by microwaves;

turning off the microwave generator and the microwave heater, starting the infrared heating equipment, keeping the transverse moving guide rail running, and carrying out infrared drying to obtain a dried blank body;

and taking out the dried blank, replacing the drying base plate with a degreasing base plate, loading the dried blank into the closed container, and starting the oxygen supply equipment, the infrared heating equipment and the transverse moving guide rail for degreasing.

8. The method of claim 7, wherein the microwave drying has a microwave frequency of 2.4 to 2.6GHz for 1 to 2 hours, and the reciprocating frequency of the traverse guide rail during the microwave drying is 1 to 3 times/min.

9. The method according to claim 7, wherein the temperature of the infrared drying is 70-90 ℃, the time is 3-5 h, and the reciprocating frequency of the transverse moving guide rail during the infrared drying is 1-3 times/min.

10. The method according to claim 7, wherein the degreasing is carried out at an oxygen flux of 100-140L/min, a heating temperature of 400-500 ℃ and a time of 2-4 h.

Technical Field

The invention relates to the technical field of target blank drying, in particular to an ITO target blank drying and degreasing device and a drying and degreasing method.

Background

In recent years, with the increasing maturity of coating technology, people have increasingly greater demands on targets, and the requirements on the quality of the targets are also more and more demanding, and the demands of ITO targets as essential materials in the display coating process are also increasing.

At present, the preparation process of the ITO target material comprises a cold pressing sintering method, a hot isostatic pressing method, a hot pressing method and an aerobic sintering method. The traditional cold-pressing sintering process cannot obtain the high-density ITO target material and cannot meet the production requirement. The hot isostatic pressing process has the disadvantages of high sheath difficulty, high equipment investment and low production efficiency. When the ITO target material is prepared by a hot pressing method, the requirements on the thermal stress field and the temperature field of hot pressing equipment are high, and thermal stress cracking is easy to occur in the sintering process. Therefore, compared with other methods, the aerobic sintering method is an ideal preparation process, has simple flow and small equipment investment, is suitable for mass production, but has a lot of processes to be improved, the water content of the ITO target blank obtained by slip casting is about 15 percent, the shrinkage rate of the dried blank is about 3 percent, the traditional drying process is to naturally dry the target blank in a constant-temperature and constant-humidity environment, the drying process has long drying period, often needs about 80 hours for drying, and the target blank can be dry-cracked.

Chinese patent CN108640674A discloses a method for rapidly drying an ITO target blank at constant temperature and humidity, which is characterized in that the target is dried step by step to shorten the drying time, the drying time is shortened in comparison with the traditional drying process, but the drying time is still about two days, the drying time still cannot meet the requirement of large-scale production in factories, and the dried ITO target blank is transferred to another degreasing furnace for degreasing treatment.

Disclosure of Invention

In view of the above, the present invention provides an apparatus and a method for drying and degreasing an ITO target blank. The ITO target blank drying and degreasing device provided by the invention can greatly shorten the drying time, improve the yield of dried target blanks, can perform degreasing, integrates the drying and degreasing process, simplifies the process and saves the cost.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides an ITO target blank drying and degreasing device which comprises a console, oxygen supply equipment, a microwave generator, a connecting waveguide, a microwave heater, infrared heating equipment, a transverse moving guide rail and a base plate,

the connecting waveguide tube, the microwave heater, the infrared heating equipment, the transverse moving guide rail and the base plate are positioned in a closed container with an opening, and the console, the oxygen supply equipment and the microwave generator are positioned outside the closed container with the opening;

the microwave generator is connected with the microwave heater through a connecting waveguide tube;

the base plate is positioned on the surface of the transverse moving guide rail; the base plate is a dry base plate or a degreasing base plate;

the microwave heater and the infrared heating device are arranged above the transverse moving guide rail.

Preferably, the degreasing pad comprises an upper plate, a lower plate and a pad ball, wherein the pad ball is positioned between the upper plate and the lower plate and can rotate.

Preferably, the dry backing plate is made of gypsum, and the degreasing backing plate is made of resin.

Preferably, the material of the backing ball is high temperature resistant ceramic.

Preferably, the material of the pad ball is zirconia ceramic.

Preferably, the infrared heating device comprises an infrared heating lamp group and an infrared thermometer.

The invention also provides a drying and degreasing method of the ITO target blank, and the drying and degreasing device of the ITO target blank by using the technical scheme comprises the following steps:

placing the ITO target blank formed by grouting on a drying base plate, loading the ITO target blank into the closed container, starting a microwave generator and a microwave heater, starting a transverse moving guide rail at the same time, and performing microwave drying to obtain a blank dried by microwaves;

turning off the microwave generator and the microwave heater, starting the infrared heating equipment, keeping the transverse moving guide rail running, and carrying out infrared drying to obtain a dried blank body;

and taking out the dried blank, replacing the drying base plate with a degreasing base plate, loading the dried blank into the closed container, and starting the oxygen supply equipment, the infrared heating equipment and the transverse moving guide rail for degreasing.

Preferably, the microwave frequency of the microwave drying is 2.4-2.6 GHz, the time is 1-2 h, and the reciprocating frequency of the transverse moving guide rail during the microwave drying is 1-3 times/min.

Preferably, the temperature of the infrared drying is 70-90 ℃, the time is 3-5 h, and the reciprocating frequency of the transverse moving guide rail during the infrared drying is 1-3 times/min.

Preferably, the degreasing oxygen flux is 100-140L/min, the heating temperature is 400-500 ℃, and the time is 2-4 h.

The invention provides an ITO target blank drying and degreasing device which comprises a console, oxygen supply equipment, a microwave generator, a connecting waveguide tube, a microwave heater, infrared heating equipment, a transverse moving guide rail and a base plate, wherein the connecting waveguide tube, the microwave heater, the infrared heating equipment, the transverse moving guide rail and the base plate are positioned in a closed container with an opening, and the console, the oxygen supply equipment and the microwave generator are positioned outside the closed container with the opening; the microwave generator is connected with the microwave heater through a connecting waveguide tube; the base plate is positioned on the surface of the transverse moving guide rail; the base plate is a dry base plate or a degreasing base plate; the microwave heater and the infrared heating device are arranged above the transverse moving guide rail.

Compared with the prior art, the invention has the following beneficial technical effects:

1. the invention provides an ITO target blank drying and degreasing device, which utilizes a microwave heater and infrared heating equipment, and uses a method of mixing and drying microwave drying and infrared drying, wherein the microwave drying is different from the traditional drying, the target blank is dried from outside to inside in a traditional drying chamber, if the temperature and humidity difference between the external environment and the target blank is too large, the internal and external drying rates are uneven, stress is generated, and the blank is cracked, so the drying environment with constant temperature and humidity is needed, the drying is carried out by circulating a drying medium, the drying time is long, the drying efficiency is low, the drying environment is harsh, the microwave drying principle is that microwave can directly act on water molecules to convert into heat energy, and the medium is simultaneously heated inside and outside due to the penetrating performance of the microwave, heat conduction is not needed, so the constant temperature and humidity environment is not needed in the microwave drying, and the drying rate is high, Energy conservation, high production efficiency, uniform drying, clean production, easy realization of automatic control, improvement of product quality and the like. However, the principle of microwave drying is that microwaves act on water molecules, and when the water content of the target blank is reduced, the microwave drying efficiency is correspondingly reduced, so that the microwave drying and infrared drying combined mode is adopted, and the drying speed is improved.

2. The device provided by the invention is provided with the transverse moving guide rail, so that the target blank can transversely reciprocate at a constant speed in the drying process, the aim of uniform drying is fulfilled, and the condition that the target blank is cracked due to nonuniform microwave drying or infrared drying is avoided.

3. The device provided by the invention is a drying and degreasing integrated furnace, and can finish two processes of drying and degreasing simultaneously in the same furnace, thereby simplifying the process and saving the investment of factory site equipment.

4. The degreasing bearing plate provided by the invention has the advantages that the upper plate and the lower plate fix the bearing balls at corresponding positions and can still rotate, the ITO target blank shrinks obviously in the degreasing process, the common bearing plate cannot be used for introducing oxygen below the target blank, the deoxidation is serious, and the friction force between the ITO target blank and the bearing plate is overlarge, so that the deformation and even cracking phenomena occur in the degreasing and shrinking process of the target blank.

Drawings

FIG. 1 is a schematic structural diagram of an ITO target blank drying and degreasing device of the invention, wherein 1-a console, 2-oxygen supply equipment, 3-a microwave generator, 4-a connecting waveguide, 5-a microwave heater, 6-infrared heating equipment, 7-a transverse moving guide rail and 8-a backing plate;

FIG. 2 is a schematic structural view of a degreasing pad, wherein 9-upper plate, 10-bolster, 11-lower plate;

FIG. 3 is a physical photograph of the dried body;

fig. 4 is a photograph of a dried and defatted product.

Detailed Description

The invention provides an ITO target blank drying and degreasing device which comprises a console, oxygen supply equipment, a microwave generator, a connecting waveguide, a microwave heater, infrared heating equipment, a transverse moving guide rail and a base plate,

the connecting waveguide tube, the microwave heater, the infrared heating device, the transverse moving guide rail and the base plate are positioned in a closed container with an opening, and the control console, the oxygen supply device and the microwave generator are positioned outside the closed container with the opening;

the microwave generator is connected with the microwave heater through a connecting waveguide tube;

the base plate is positioned on the surface of the transverse moving guide rail; the base plate is a dry base plate or a degreasing base plate;

the microwave heater and the infrared heating device are arranged above the transverse moving guide rail.

Fig. 1 is a schematic structural diagram of an ITO target blank drying and degreasing device of the present invention, wherein 1 is a console, 2 is an oxygen supply apparatus, 3 is a microwave generator, 4 is a connecting waveguide, 5 is a microwave heater, 6 is an infrared heating apparatus, 7 is a transverse moving guide rail, 8 is a backing plate, the connecting waveguide 4, the microwave heater 5, the infrared heating apparatus 6, the transverse moving guide rail 7 and the backing plate 8 are located in a closed container with an opening, and the console 1, the oxygen supply apparatus 2 and the microwave generator 3 are located outside the closed container with the opening; the microwave generator 3 is connected with a microwave heater 5 through a connecting waveguide tube 4; the backing plate 8 is positioned on the surface of the transverse moving guide rail 7; the backing plate 8 is a dry backing plate or a degreased backing plate; the microwave heater 5 and the infrared heating device 6 are arranged above the transverse moving guide rail 7.

In the present invention, the degreasing pad preferably includes an upper plate, a lower plate, and a pad ball, preferably, rotatably positioned between the upper plate and the lower plate. Fig. 2 is a schematic structural view of the degreasing pad, wherein 9 is an upper plate, 10 is a pad ball, and 11 is a lower plate. According to the backing plate, the target blank is supported by the backing ball, so that oxygen can still flow below the blank, the problem of oxygen loss of the target blank is solved, the backing ball can rotate, and the problem of deformation and cracking in the process of shrinkage of the target blank is solved.

In the present invention, the material of the dry pad is preferably gypsum, and the material of the degreased pad is preferably resin, and the specific type of the resin is not particularly limited, and may be any type known to those skilled in the art.

In the present invention, the material of the aforementioned spacer is preferably a high-temperature resistant ceramic, and more preferably a zirconia ceramic.

In the present invention, the infrared heating device preferably includes an infrared heating lamp set and an infrared thermometer.

In the invention, the control console can control microwave frequency, microwave drying time, infrared heating temperature, infrared heating time, oxygen flux, oxygen introducing time and guide rail moving speed.

The invention also provides a drying and degreasing method of the ITO target blank, and the drying and degreasing device of the ITO target blank by using the technical scheme comprises the following steps:

placing the ITO target blank formed by grouting on a drying base plate, loading the ITO target blank into the closed container, starting a microwave generator and a microwave heater, starting a transverse moving guide rail at the same time, and performing microwave drying to obtain a blank dried by microwaves;

turning off the microwave generator and the microwave heater, starting the infrared heating equipment, keeping the transverse moving guide rail running, and carrying out infrared drying to obtain a dried blank body;

and taking out the dried blank, replacing the drying base plate with a degreasing base plate, loading the dried blank into the closed container, and starting the oxygen supply equipment, the infrared heating equipment and the transverse moving guide rail for degreasing.

According to the invention, the ITO target blank formed by grouting is placed on a drying base plate, the drying base plate is placed in the closed container, the microwave generator and the microwave heater are started, the transverse moving guide rail is started at the same time, and microwave drying is carried out, so that the blank dried by microwave is obtained. In the invention, the water content of the ITO target blank subjected to slip casting is preferably 10-20%, and more preferably 15%. In the invention, after the dry backing plate with the ITO target blank subjected to slip casting is filled into the closed container, the opening is preferably closed to prevent microwave leakage from causing harm to workers.

In the invention, the microwave frequency of the microwave drying is preferably 2.4-2.6 GHz, the time is preferably 1-2 h, and the reciprocating frequency of the transverse moving guide rail during the microwave drying is preferably 1-3 times/min, and more preferably 2 times/min. In the present invention, the traverse guide is preferably reciprocated at a uniform speed.

In the invention, the water content of the blank after microwave drying is preferably 3-5%.

After the blank body after microwave drying is obtained, the invention closes the microwave generator and the microwave heater, starts the infrared heating device, keeps the transverse moving guide rail running, and carries out infrared drying to obtain the dried blank body.

In the invention, the temperature of the infrared drying is preferably 70-90 ℃, more preferably 80 ℃, the time is preferably 3-5 h, and the reciprocating frequency of the transverse moving guide rail during the infrared drying is preferably 1-3 times/min, more preferably 2 times/min. In the present invention, the traverse guide is preferably reciprocated at a uniform speed. In the invention, the blank body after microwave drying has certain strength, and at the moment, the microwave drying effect is not obvious any more, and infrared drying is needed. In the invention, the water content of the dried blank is preferably 0.3-0.5%.

After the dried green body is obtained, the dried green body is taken out, the drying cushion plate is replaced by a degreasing cushion plate, the dried green body is put into the closed container, and meanwhile, oxygen supply equipment, infrared heating equipment and a transverse moving guide rail are started for degreasing.

In the invention, the degreasing oxygen flux is preferably 100-140L/min, the heating temperature is preferably 400-500 ℃, and the time is preferably 2-4 h.

In the present invention, the degreasing rate of the degreasing can reach 99.99%, that is, complete degreasing is achieved.

In order to further illustrate the present invention, the following describes the drying and degreasing device and the drying and degreasing method for the ITO target blank in detail with reference to examples, but they should not be construed as limiting the scope of the present invention.