CN114656134A - Composite quartz glass plate and preparation method thereof - Google Patents
Composite quartz glass plate and preparation method thereof Download PDFInfo
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- CN114656134A CN114656134A CN202210156568.7A CN202210156568A CN114656134A CN 114656134 A CN114656134 A CN 114656134A CN 202210156568 A CN202210156568 A CN 202210156568A CN 114656134 A CN114656134 A CN 114656134A
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- quartz glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/20—Uniting glass pieces by fusing without substantial reshaping
- C03B23/203—Uniting glass sheets
Abstract
A process for preparing the composite quartz glass plate with more than 2 layers includes such steps as clamping the quartz glass plate, and heating for sintering. The heating method is combustion heating or electric heating, and the heating method is local heating and/or overall heating. The method can prepare the composite quartz glass plate with comprehensive performance, and develops a novel composite material. The method can give full play to the advantages and properties of different quartz plates, obtain comprehensive properties superior to those of a substrate, greatly expand the application field of the quartz plates, and can be applied to a new functional application field; is suitable for processing various quartz glass plates to prepare composite quartz glass plates.
Description
Technical Field
The invention relates to application and processing and manufacturing technologies of quartz glass plates, in particular to a composite quartz glass plate and a preparation method thereof.
Background
The quartz glass has excellent high temperature resistance, thermal shock resistance, low expansion, corrosion resistance, stable chemical property, no radiation damage and excellent optical property; is widely applied to the fields of light sources, semiconductors, photovoltaics, chemical engineering, medical treatment, metallurgy, national defense and the like.
The properties of quartz glass have respective advantages according to the structural form and doping of different elements. The transparent quartz glass has high light transmittance, and the opal quartz has low visible and short wave light transmittance and excellent far infrared performance. According to different manufacturing methods and subsequent doping processes, various transparent quartz products have different light wave transmittances and are applied to different fields.
For the requirement of simultaneously obtaining comprehensive properties or superposition of more than 2 and 3 properties, the quartz glass needs to be subjected to composite design and manufacture to obtain the composite quartz glass material.
Disclosure of Invention
According to the embodiment of the disclosure, the invention aims to provide a composite quartz glass plate and a preparation method thereof, which solve the technical problem of comprehensive performance which is not possessed by single quartz glass.
A process for preparing the composite quartz glass plate with more than 2 layers includes such steps as clamping the quartz glass plate, and heating for sintering.
Further, the quartz glass plate used is 1 or more than 2 quartz glass materials, and the quartz glass material is a transparent quartz glass plate, an opaque quartz glass plate, a high-transmittance quartz glass plate, a red-black quartz glass plate, an opal quartz glass plate, a synthetic quartz glass plate, an ultraviolet-filtering quartz glass plate, a common quartz plate, a high-purity quartz plate and/or a doped quartz glass plate.
Further, the heating method is combustion heating or electric heating, and the heating method is local heating and/or bulk heating.
Further, the processing environment of the composite quartz glass plate is a vacuum environment, an atmospheric environment or inert gas.
Further, the heating method is combustion heating, the quartz glass plate is clamped firmly by a clamp, the quartz glass plate is tensioned by a tensioning wheel, the pressure of the tensioning wheel is 5-8N, the flame temperature is controlled to be 2300-2500 ℃, the over-firing speed of the quartz plate is 2-5 cm/min, and the pressure of combustion gas and combustion-supporting gas is not less than 0.5 Mpa.
Further, the heating method is electrically heated in a high-temperature vacuum furnace, quartz glass plates are stacked in the high-temperature vacuum furnace, vacuumized, heated to reach a certain temperature, pressurized and cooled.
Further, vacuumizing, and starting heating after the vacuum degree is less than 1pa, wherein the temperature of a thermal field temperature zone of a thermal power curve is less than or equal to 1000 ℃, and the temperature rise speed is controlled within 15 ℃/min; the temperature of the thermal field temperature zone is 1000 ℃ and less than T and less than or equal to 1400 ℃, and the temperature rise speed is controlled within 10 ℃/min; the temperature of the thermal field temperature zone is 1400 ℃ and less than T and less than or equal to 1900 ℃, the temperature rise speed is controlled within 5 ℃/min, and the heating is carried out until the target temperature is reached; keeping the temperature for 10-30 min.
Further, pressurizing the furnace by using inert gas, wherein the pressure raising speed is lower than 5000Pa/min, and the target pressure below 5 atmospheres is reached; gradually controlling the temperature to cool, and controlling the speed within 5 ℃/min; the central temperature of the quartz glass plate is lower than 150 ℃, and the furnace door is opened.
Further, a composite quartz glass plate obtained by the above-mentioned production method.
The invention has the advantages and effects that:
(1) the method can prepare the composite quartz glass plate with comprehensive performance, and develops a novel composite material.
(2) The composite quartz glass plate prepared by the invention can fully exert the advantages and properties of different quartz plates, obtain comprehensive properties superior to those of a substrate, greatly expand the use field of the quartz plate and can be applied to a new functional use field;
(3) the preparation method can be suitable for processing various quartz glass plates to prepare the composite quartz glass plate.
It should be understood that what is described in this summary section is not intended to define key or essential features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
FIG. 1 is a schematic cross-sectional view of a composite quartz glass plate according to the present invention.
FIG. 2 is a schematic view of the production process 1 of the present invention.
FIG. 3 is a schematic view of the preparation method 2 of the present invention.
FIG. 4 is a schematic view of the preparation method 3 of the present invention.
Wherein, the attached figure 1 is marked as: A. b, A1, B1, C1, A2, B2, C2 and D2 are quartz glass plates.
The attached figure 2 is marked as: 2-1, lifting rod; 2-2, quartz glass plate clamp; 2-3, a blast lamp; 2-4, supporting a blast lamp; 2-5, a frame; 2-6, a quartz glass plate to be processed; 2-7, a blast lamp base; 2-8 and a tensioning wheel.
The attached figure 3 is marked as: 3-1, preparing a quartz glass plate A to be processed; 3-2, longitudinally tensioning the rolling wheel; 3-3, shaping plates; 3-4, transversely tensioning the rolling wheel; 3-5, supporting the flat plate by a quartz glass plate; 3-6, transversely tensioning the rolling wheel; 3-7, preparing a quartz glass plate B to be processed; 3-8, and a blast lamp.
The attached figure 4 is marked as: 4-1, cooling the furnace body by water; 4-2, a heat-insulating layer; 4-3, a heater; 4-4, heating electrodes; 4-5, air intake; 4-6, molding; 4-7, a heater; 4-8, heating electrodes; 4-9, exhausting; 4-10, detecting a pipeline; 4-11, an infrared thermometer; 4-12, and collecting the quartz glass plates to be processed.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In addition, the term "and/or" herein is only one kind of association relationship describing an associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
A composite quartz glass plate and a preparation method thereof, the composite quartz glass plate is formed by compounding two or more layers of quartz glass plates; the preparation method of the composite quartz glass plate can carry out thermal processing in a torch burning mode and carry out heating, jointing and bonding among different quartz glass plates in an electric heating or other heat generating modes. The viscosity of the two quartz glass plates at high temperature is less than 109dPa s, and Si and O atoms are fusion bonded at high temperature. According to different heating mode characteristics, the blowtorch heating is a local heating mode for rapid cooling, and the electric heating is an integral heating mode;
the number of layers of the composite quartz glass plate is prepared on the basis of the target number of layers, and the number of layers is not limited, and is at least more than 2.
The quartz glass plate can be a transparent quartz glass plate, a high-transmittance quartz glass plate, a red-black quartz glass plate, an opal quartz glass plate, a synthetic quartz glass plate, an ultraviolet-filtering quartz glass plate, a quartz glass plate with other performances, and the like.
The heating method of the preparation method of the composite quartz glass plate can be combustion heating, electric heating and other heating methods, and can be implemented in any heating method capable of generating high temperature to enable the quartz glass to reach the target softening temperature.
The processing environment of the composite quartz glass plate can be a vacuum environment, an atmospheric environment, an inert gas environment and other special requirements.
The quartz glass plate can be compounded to combine various different types of quartz glass, and the quartz glass plates between the layers can be subjected to type adjustment according to requirements.
The type and the appearance shape of the quartz glass plate are determined according to the change of target processing requirements. In the burning method and other local heating method preparation processes, the thickness of the quartz glass plate is increased, preferably, the thickness of a single quartz glass plate is more than 3mm, and the residual stress in the quartz glass plate needs to be eliminated by heating before and after heating so as to avoid cracking and deformation. The electric heating and other integral heating methods do not need heating to eliminate residual stress due to the characteristic of an integral heating mode, and the temperature rise speed of the plates to be processed with different thicknesses is set reasonably according to the pertinence.
The quartz glass plate heating means may utilize various forms of heating means: local heating, integral heating and different heating modes are combined flexibly to apply the advantageous process method to prepare the product. For quartz glass plates with a thickness of more than 3mm, a local heating mode is used, and heating is needed before and after heating for stress removal treatment.
The combustion method equipment for preparing the composite quartz glass plate adopts a combustion heating mode and the main structure of the equipment for realizing the production technology of the composite quartz glass plate is as follows: quartz glass plate telecontrol equipment, high temperature resistant anchor clamps, blowtorch, high temperature resistant runner, electrical control part, temperature sensing device, pressure sensor, tolerance controlling means, human-computer interaction interface etc.. The accurate composite quartz glass plate is obtained by accurately controlling parameters such as temperature, movement speed, pressure and the like. The flame temperature is generally controlled to be 2300-2500 ℃, the over-fire speed of the quartz plate is 2-5 cm/min, and the pressure of combustion gas and combustion-supporting gas is not less than 0.5 Mpa. Further preferably, the flame temperature is 2400 ℃, the quartz plate fire passing speed is 2.5cm/min, the combustion gas pressure is 0.6MPa, and the combustion-supporting gas pressure is 0.8 MPa.
The combustion method and the equipment use fuel and combustion improver, which can be the combination of fuel gas oxygen, hydrogen gas oxygen, and the like.
The preparation method of the composite quartz glass plate adopts an electric heating mode and the production technology of the composite quartz glass plate realizes the main structure as follows: the device comprises a quartz glass plate mold, a heater, a furnace body, an electrical control assembly, a temperature control assembly, a pressure control assembly, a vacuum pump assembly device, a human-computer interaction interface and the like. By precisely controlling the temperature, vacuum, pressure control and the like, a precise composite quartz glass plate is obtained. The temperature of the thermal field temperature zone is less than or equal to 1000 ℃, and the temperature rise speed is controlled within 15 ℃/min; the temperature of the thermal field temperature zone is 1000 ℃ and less than T and less than or equal to 1400 ℃, and the temperature rise speed is controlled within 10 ℃/min; the temperature of the thermal field temperature zone is 1400 ℃ and less than T and less than or equal to 1900 ℃, and the temperature rise speed is controlled within 5 ℃/min; the pressure in the furnace is lower than 1 Pa; pressurizing to normal pressure or 1-3 times of atmospheric pressure after the high-temperature lamination is finished, wherein the pressure increasing speed is lower than 5000 Pa/min; the cooling speed is controlled within 5 ℃/min; and discharging the quartz plate at the central temperature of less than 150 ℃.
Example 1
The two-layer composite quartz glass plate of FIG. 1, wherein A and B are different kinds of quartz materials;
the three-layer composite quartz glass plate in fig. 1, wherein a1, B1 and C1 are different kinds of quartz materials or a1 and C1 are the same materials, and B1 is different from a 1;
the four-layer composite quartz glass plate of FIG. 1, wherein A2, B2, C2 and D2 are different kinds of quartz materials or other combinations of different materials for adjacent quartz layers;
the number of layers and the material of the composite quartz glass plate can be designed and manufactured according to actual requirements.
Example 2
The embodiment is a preparation method for preparing a composite quartz glass plate by vertical combustion heating. As shown in fig. 2.
Firmly clamping the quartz glass plate (2-6) to be processed by using a quartz glass plate clamp (2-2); the blowtorch (2-3) is fixed on the blowtorch base (2-7) by using a blowtorch support (2-4); the lifting rod (2-1) can move the quartz glass plate to be processed up and down at a constant speed, and the speed can be set according to requirements. The quartz glass plate to be processed is moderately tensioned using a tensioning wheel (2-8). The frames (2-5) provide a space and location interface for mounting various components.
The device is assisted by a motion control system, a temperature sensing feedback system, a pressure sensor, an air flow control device, a human-computer interaction interface and the like. The accurate composite quartz glass plate is obtained by accurately controlling parameters such as temperature, movement speed, pressure and the like.
The preparation process is summarized as follows:
(1) firmly clamping the quartz glass plate (2-6) to be processed by using a quartz glass plate clamp (2-2); tensioning the quartz plate by using a tensioning wheel (2-8); the pressure of the tension wheel is 5-8N;
(2) igniting flame of the blowtorch (2-3), and adjusting the flame head of the blowtorch to be consistent; and infrared temperature measuring equipment is used for measuring the fire heads on the two sides, the temperature ranges from 2300 ℃ to 2500 ℃, and the temperature difference between the two sides does not exceed 20 ℃;
(3) heating the quartz glass plate to a preset temperature range, starting to operate the quartz glass plate movement device at a set speed, and driving the quartz glass plate and the clamp to move at a constant speed by the lifting rod (2-1); controlling the fire passing speed to be 2-5 cm/min;
(4) fusing and sintering two or more layers of quartz glass plates into a composite quartz plate within a reasonable temperature and fire passing speed range;
(5) the temperature is lower than 400 ℃, and the composite quartz glass plate is taken down.
Example 3
The embodiment is a preparation method for preparing a composite quartz glass plate by horizontal combustion heating. As shown in fig. 3.
Clamping and stabilizing a quartz glass plate A (3-1) to be processed by using a longitudinal tensioning rolling wheel (3-2); the quartz glass plate B (3-7) to be processed is placed on the quartz glass supporting flat plate (3-5) and is clamped and stabilized by the transverse tensioning rolling wheels (3-6). The longitudinal tensioning rolling wheel (3-2), the transverse tensioning rolling wheel (3-6) and the transverse tensioning rolling wheel (3-4) are all connected with a servo motor and can rotate according to a set speed. After the blowtorch (3-8) is ignited, the quartz glass plate A to be processed and the quartz glass plate B to be processed can be sintered into a quartz glass plate. The shaping plate (3-3) can shape the composite quartz glass plate.
The device is assisted by a motion control system, a temperature sensing feedback system, a pressure sensor, an air flow control device, a human-computer interaction interface and the like. The accurate composite quartz glass plate is obtained by accurately controlling parameters such as temperature, movement speed, pressure and the like.
The preparation process is summarized as follows:
(1) clamping and stabilizing a quartz glass plate A (3-1) to be processed by using a longitudinal tensioning rolling wheel (3-2); a quartz glass plate B (3-7) to be processed is placed on the quartz glass supporting flat plate (3-5) and is clamped and stabilized by a transverse tensioning rolling wheel (3-6);
(2) igniting the flame of a blast burner (3-8), starting combustion and heating the quartz glass plate at the temperature of 2300-2500 ℃;
(3) heating to a preset temperature range, starting to operate the quartz glass plate A to be processed and the quartz glass plate B to be processed according to a set speed, wherein the quartz glass plate A to be processed moves downwards, the quartz glass plate B to be processed moves leftwards, and the moving directions of the quartz glass plate A to be processed and the quartz glass plate B to be processed are 90 degrees vertical; the feeding speed is controlled to be 2-5 cm/min, the transverse speed and the longitudinal speed are kept consistent, and the error is within +/-0.5%;
(4) softening and fusing the quartz glass plate A to be processed on the quartz glass plate B to be processed under the high temperature of a blast lamp (3-8), and shaping by a shaping plate;
(5) the temperature is lower than 400 ℃, and the composite quartz glass plate is taken down.
Example 4
The embodiment is a preparation method for preparing a composite quartz glass plate by electric heating. As shown in fig. 4.
The main equipment is a high-temperature vacuum furnace.
The main structure of the device is as follows: a heat preservation device consisting of a heat preservation layer (4-2) is arranged in the water-cooling furnace body (4-1), and heaters (4-3) and (4-7) are arranged in the heat preservation layer; the heater obtains current voltage (4-4) and (4-8) by heating the electrodes; inert gas can be introduced into the inlet (4-5), and the outlet (4-9) is externally connected with vacuum pumps of various types so as to meet the process requirement of high vacuum degree; the infrared thermometer (4-11) monitors the temperature in the furnace in real time through the temperature detecting pipeline (4-10); the quartz glass plate assembly (4-12) to be processed is placed in a mould (4-6) for fusion sintering.
The preparation process is summarized as follows:
(1) placing a collection (4-12) of quartz glass plates to be processed in a mould (4-6) of appropriate dimensions; the mould and the quartz glass plate need to be well matched; the quartz glass plate and the mould are required to be kept in a clean state; and putting into a furnace. The moulds can be stacked;
(2) starting to vacuumize, and starting to heat after reaching the target vacuum degree (<1 pa);
(3) setting a reasonable heating power curve thermal field temperature zone to be less than or equal to 1000 ℃, and controlling the temperature rise speed to be within 15 ℃/min; the temperature of the thermal field temperature zone is 1000 ℃ and less than T and less than or equal to 1400 ℃, and the temperature rise speed is controlled within 10 ℃/min; the temperature of the thermal field temperature zone is 1400 ℃ and less than T and less than or equal to 1900 ℃, the temperature rise speed is controlled within 5 ℃/min, and the heating is carried out until the target temperature is reached; keeping the temperature for 15 min;
(4) continuously keeping the temperature and pressurizing the furnace by using inert gas, wherein the pressure increasing speed is lower than 5000Pa/min, and the target pressure of 1 atmosphere (the embodiment) is reached; gradually controlling the temperature to cool, and controlling the speed within 5 ℃/min;
(5) and opening the furnace door when the central temperature of the quartz plate is lower than 150 ℃, taking out the composite quartz glass plate and the mold assembly, and demolding to obtain the target product.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. A preparation method of a composite quartz glass plate is characterized in that the composite quartz glass plate is formed by compounding more than 2 layers of quartz glass plates, and comprises the following steps of clamping the quartz glass plates, and heating and sintering the quartz glass plates.
2. The method for producing a composite quartz glass plate according to claim 1, wherein the quartz glass plate used is 1 or 2 or more kinds of quartz glass materials, and the quartz glass materials are a transparent quartz glass plate, an opaque quartz glass plate, a high-transmittance quartz glass plate, a red-black quartz glass plate, an opal quartz glass plate, a synthetic quartz glass plate, an ultraviolet-filtering quartz glass plate, a normal quartz plate, a high-purity quartz plate and/or a doped quartz glass plate.
3. The method for producing a composite quartz glass plate according to claim 2, characterized in that the heating method is combustion heating or electric heating, and the heating method is local heating and/or bulk heating.
4. The method of manufacturing a composite quartz glass plate according to claim 3, wherein the composite quartz glass plate processing environment is a vacuum environment, an atmospheric environment or an inert gas.
5. The method for producing a composite quartz glass plate according to claim 4, wherein the heating method is combustion heating, the quartz glass plate is clamped firmly by a jig, the quartz glass plate is tensioned by a tensioning wheel, the pressure of the tensioning wheel is 5-8N, the flame temperature is controlled to be 2300-2500 ℃, the over-firing speed of the quartz plate is 2-5 cm/min, and the pressure of combustion gas and combustion-supporting gas is not less than 0.5 MPa.
6. The method for producing a composite quartz glass plate according to claim 4, wherein the heating method is electrically heating, performed in a high-temperature vacuum furnace, and the quartz glass plate is stacked in the high-temperature vacuum furnace, evacuated, heated, pressurized after reaching a certain temperature, and then cooled.
7. The method for producing a composite quartz glass plate according to claim 6, wherein the heating is started after the degree of vacuum is reached to <1pa, the temperature of the thermal field temperature region of the thermal power curve is not more than 1000 ℃, and the temperature rising rate is controlled within 15 ℃/min; the temperature of the thermal field temperature zone is 1000 ℃ and less than T and less than or equal to 1400 ℃, and the temperature rise speed is controlled within 10 ℃/min; the temperature of the thermal field temperature zone is 1400 ℃ and less than T and less than or equal to 1900 ℃, the temperature rise speed is controlled within 5 ℃/min, and the heating is carried out until the target temperature is reached; keeping the temperature for 10-30 min.
8. The method for producing a composite quartz glass plate according to claim 7, wherein the inside of the furnace is pressurized with an inert gas at a rate of less than 5000Pa/min to a target pressure of 5 atmospheres or less; gradually controlling the temperature to cool, and controlling the speed within 5 ℃/min; the central temperature of the quartz glass plate is lower than 150 ℃, and the furnace door is opened.
9. A composite quartz glass plate produced by the production method as set forth in any one of claims 1 to 8.
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| CN202210156568.7A CN114656134A (en) | 2022-02-21 | 2022-02-21 | Composite quartz glass plate and preparation method thereof |
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| CN202210156568.7A CN114656134A (en) | 2022-02-21 | 2022-02-21 | Composite quartz glass plate and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122783A (en) * | 1994-05-26 | 1996-05-22 | 赫罗伊斯石英玻璃有限公司 | Method and apparatus for making quartz glass plate |
| JP2004067456A (en) * | 2002-08-07 | 2004-03-04 | Shinetsu Quartz Prod Co Ltd | Apparatus and method of manufacturing multilayer quartz glass plate |
| CN106032309A (en) * | 2015-03-20 | 2016-10-19 | 深圳光启高等理工研究院 | Quartz glass based metamaterial and preparation method thereof |
| CN110272204A (en) * | 2019-06-28 | 2019-09-24 | 京东方科技集团股份有限公司 | Composite decking glass, total reflection display device, selwnite English glass and preparation method |
| US20200103559A1 (en) * | 2018-10-01 | 2020-04-02 | AGC Inc. | Glass laminate, front plate for display, and display device |
| CN113371985A (en) * | 2021-07-16 | 2021-09-10 | 沈阳偶得科技有限公司 | Device and method for manufacturing laminated quartz heat insulation plate |
-
2022
- 2022-02-21 CN CN202210156568.7A patent/CN114656134A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122783A (en) * | 1994-05-26 | 1996-05-22 | 赫罗伊斯石英玻璃有限公司 | Method and apparatus for making quartz glass plate |
| JP2004067456A (en) * | 2002-08-07 | 2004-03-04 | Shinetsu Quartz Prod Co Ltd | Apparatus and method of manufacturing multilayer quartz glass plate |
| CN106032309A (en) * | 2015-03-20 | 2016-10-19 | 深圳光启高等理工研究院 | Quartz glass based metamaterial and preparation method thereof |
| US20200103559A1 (en) * | 2018-10-01 | 2020-04-02 | AGC Inc. | Glass laminate, front plate for display, and display device |
| CN110272204A (en) * | 2019-06-28 | 2019-09-24 | 京东方科技集团股份有限公司 | Composite decking glass, total reflection display device, selwnite English glass and preparation method |
| CN113371985A (en) * | 2021-07-16 | 2021-09-10 | 沈阳偶得科技有限公司 | Device and method for manufacturing laminated quartz heat insulation plate |
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