TW593204B - A method of producing lithium aluminosilicate ceramics - Google Patents

Abstract

A method of producing lithium aluminosilicate (LAS) ceramics, which uses a mixing powder of lithium carbonate, aluminum oxide, and silicon oxide as a raw material powder. After being mixed by ball milling and baked dry, the raw material powder is processed with a calcinations process such that the raw material powder becomes a precursor. The precursor is then pressed into the green ceramic. Significantly, the high heat conducting metal sheets are tightly attached above and below the surfaces of the ceramic during sinter and heat-treatment processes. A solid-state sinter process is performed with the green ceramic. Next, the ceramic is treated with a proper heat-treatment process. Since the top and bottom surfaces of the ceramic are capped with the high heat conducting metal, the ceramics are uniformly heated during all the heating processes. The ceramics of this invention exhibit more uniform properties and stable structure, which allow them to be used as temperature compensation components and athermal products.

Description

593204 _Case No. 91118814_ Revised_ Five. Description of the invention (1) The present invention relates to a method for manufacturing Tao Yao materials, and in particular to a method for manufacturing lithium aluminosilicate ceramics. In recent years, due to the influence of temperature on the precision components and high-tech systems of precision components and instruments, the problem of reducing the original efficiency has become increasingly significant. Often, the thermal expansion of the components due to the different expansion coefficients between the component materials and the environmental temperature changes, so the development of negative thermal expansion Materials are used as thermal compensation elements to provide general positive thermal expansion materials. Compounding them into an athermal device that is not affected by the ambient temperature and maintains the original component performance should also be a research with great application value. In the case of thermal compensation, for example, optical fiber communication technology in precision optics, and fiber Bragg grating (FBG) components of high-density demultiplexer (DWDM), in order to ensure that the fiber can transmit different channels on more channels Wavelength signals make full use of the optical fiber capacity, so thermal compensation materials are needed to recombine to reduce the effect of temperature on the reflected wavelength of the grating. At present, we have successfully tested the use of / 5 -eucryptite (/ 5-eucryptite, Li A 1 S i 0 4) high negative expansion and linear characteristics, the lithium aluminum silicate negative expansion ceramic substrate and the required optical fiber master The composite material can control the temperature coefficient variation of the center wavelength of the fiber grating to an allowable standard value of 1 pm / below, so that the optical fiber communication can not be affected by the external temperature, and then developed into a temperature-insensitive fiber with self-compensation. Grating device. In addition, the thermal compensation technology can also be applied to the temperature rise thermal displacement compensation application technology of the high-speed rotating shaft of CNC machine tools. Lithium aluminosilicate ceramic materials include / 5-eucryptite (LiAlSi04) phase with negative expansion, Spodumene (LiAlSi20ri) phase with almost zero expansion, and Petalite (LiAlSi401G) phase. Wait. Among them, the thermal expansion coefficient of cold-eucryptite is about -6x 1 0-fi / ° C to -8 X 1 0-V ° C, and it also has high mechanical strength, chemical

9285twf2.ptd Page 6 593204 Case No. 91118814__Year Month Day Amendment 5. The description of the invention (2). The structure of the rocky powder requires glass temperature salt, salt expansion method, and porcelain Xu Xuan, for example, sets the temperature of pottery to high glass. The acid number and the acid square expansion square, Tao Bu made more than the former to the degree of the high degree of silicon made of silicon-based silicon, etc. See the system t and can be heated to f to produce a stable aluminum expansion aluminum, Youboli has already mentioned the method of} to exchange the high-tech ceramics and lithium-free lithium wire method and other systems, bep points are not burned to 85, it is turned into)) the material of the glass material is more square heat transfer method w R into And this 5, phase ^ 28 glassy certain fixed material. The material used in the production of square 1 is 66 ° c and the temperature is 7 ′. The material is stable and stable. As a dedication to ca, 000, low U08, the materials mentioned are more ceramic materials, the shape of the system is made of lni variants, S611, from 6's porcelain to homogeneous expansion of the porcelain ruler material, but changed (U to UUS, its pottery is used for ceramics, materials, etc., which are made of expanded pottery. They are filled with AiAC, and they are made of salt. Good ceramic materials. The ot plate of fine ceramics, which is a fine-grained acid-fixing pottery, is made by Taro crystal W1, and now it is steadily broken and arw separated from a salt pottery am base J, which is more and more Aluminium, acid salt ak porcelain; complete the degree of SW to make the "Be" and the homogeneous lithium is tied with silicon peracid S ceramic 99. Wen Ke {and the corresponding hair can be used, the name of each species is resistant The thermal shock resistance and the industry are more commonly used to make lithium-aluminum melting methods, that is, in the literature on Zhong Mingshi Xi. For example, A. The negative expansion of IEICE solid solution, ρρ · 71 (19 difference to adjust the thermal expansion end Sintering and ceramic firing Dense and stable powder sintering before sintering of ceramics 120 ° C to 1300 ° C, / 3 -Zhongxiashi single phase 'consumes a lot of energy. Melting The method is easy to produce after quenching. In view of this, the ceramic manufacturing method has a more linear expansion curve. The other method of the present invention can obtain a curve that is more dense and more dense. The present invention provides a

9285t.wf2. Ptd Page 7 593204 Case No. 91111814 Rev. _ V. Description of the Invention (3) The powder of lithium carbonate, alumina, and silicon oxide is used as the final product. After the raw material powder is mixed and dried by ball milling, the raw material is calcined to make the raw material powder into a pre-powder. Then, it is pressed into a green embryo, and a metal sheet is closely adhered on the upper surface and the lower surface of the green embryo (the material of the high thermal conductivity metal sheet is a conductivity higher than 10 genera). Then, a sintering process is performed, and the green embryo is sintered into a ceramic porcelain for a heat treatment process. The invention uses a solid state sintering method to produce lithium aluminosilicate ceramics. During the heating process (including the sintering process and the heat treatment process), a high sheet is added to help uniformize the temperature field of ceramic heating. Highly thermally conductive metal sheets must be bonded with ceramics to make the heat transfer uniform. . Moreover, the process is processed after the sintering process to improve the thermal expansion retardation and instability of the ceramic. Although the present invention directly synthesizes lithium aluminum silicate ceramics from lithium carbonate, alumina, and oxygen, it may be produced in high temperature reactions. Erosion of oxides or ceramics. However, in the present invention, the firing process of the pre-powder is performed before firing, so that the middle oxide or ceramic can be prevented from being attacked by lithium carbonate, and the ceramic process can be smoothly completed. In addition, in the ceramic sintering process, the ceramics are tightly covered with a highly thermally conductive metal, and the heat can be more uniformly introduced into the ceramic raw embryo grains during the sintering process to reduce the anisotropic effect, so that The overall ceramic grains are arranged more randomly, and the subsequent heat treatment process can make the grains heal again to form a denser and more stable ceramic. The invention also provides a method for manufacturing a ceramic material. The raw powder powder is pre-powdered and combined with high thermal conductivity W / mK of gold 1 to conduct heat tightly to the ceramic material. Thermal image of metal with lines. The reaction of lithium powder and sintering process sintered the upper and lower embryos to produce embryos, so that the crystals were distributed with each other. And grow ’this method

9285t.wf2. Pt.d Page 8 593204 _Case No. 91118814_ Year Month Amendment_ V. Description of the invention (4) Provide pre-powder. Next, the front powder is pressed into a green embryo, and a high thermal conductivity metal sheet is closely adhered to the upper surface and the lower two surfaces of the green embryo. Then, a sintering process is performed to sinter the green body into a ceramic, and the ceramic is subjected to a heat treatment process. Among them, when disposing the pre-powder, a mixed powder including at least one component or more is used as a raw material powder. After mixing and grinding the raw material powder, the raw material powder is subjected to a calcination process to form the raw material powder into a pre-powder. The present invention uses a solid state sintering method to produce ceramic materials. In all heating processes (including sintering process and heat treatment process), a high thermally conductive metal sheet is covered to help uniform ceramic heating temperature field. The high thermally conductive metal sheet must be closely attached to the ceramic so that Heat transfer is even. Moreover, after the sintering process, a heat treatment process is performed to improve the thermal expansion retardation and instability of the ceramic. In addition, in the ceramic sintering process, the ceramic green embryo is tightly covered with a high thermal conductive metal on the upper and lower sides of the ceramic green embryo, so that the heat can be evenly transmitted to the ceramic green embryo, so that the green embryo grains are subject to thermal reactions during the sintering process. In order to reduce the anisotropic effect between the crystals, the overall ceramic grains are more randomly arranged and distributed. Moreover, the subsequent heat treatment process can make the grains heal and grow again, and form a denser and more stable ceramic. In order to make the above and other objects, features, and advantages of the present invention more comprehensible, a preferred embodiment is given below in conjunction with the accompanying drawings to make a detailed description as follows: Symbols of the drawings: 1 0 0 1 0 2 1 0 4 1 0 6 1 0 8 1 1 0 1 1 2 Step Examples The present invention uses a pre-powder calcination treatment and then performs solid firing.

9285t.wf2. Pt.d Page 9 593204 _Case No. 91118814_ Year Month Amendment_ V. Description of the invention (5) Synthetic ceramics by way of knot. In the sintering process, the ceramic body can be uniformly heated due to the close contact between the top and bottom of the ceramic, so that the ceramic body can be denser and more stable by good heat treatment. FIG. 1 is a flowchart showing the steps of the method for manufacturing a ceramic material according to the present invention. Please refer to Fig. 1. First, the raw material powder is prepared. The ceramic raw material powder which can be volatilized during high temperature sintering, or the ceramic is sensitive to heat, and even has no special requirements in the general process. For example, the raw material powder is Lithium carbonate, aluminum oxide, silicon oxide, tungsten oxide, zirconia, lithium oxide, niobium oxide, vanadium oxide, yttrium oxide, barium carbonate, titanium oxide, and the like. In this embodiment, the production of lithium aluminosilicate ceramics is taken as an example, so the raw material powder is, for example, lithium carbonate, alumina, and silicon oxide, and the molar ratio of lithium carbonate, alumina, and silicon oxide is, for example, 1: 1 ·· 2 to 1 ·· 1 ·· 3 or so (step 1 0 0). Next, ball milling and mixing are performed (step 102). The steps are, for example, firstly using a wet ball milling method to uniformly mix lithium carbonate, alumina, and silicon oxide powder, and then putting the powder after the wet ball milling is completed. Oven drying. Among them, ethanol is used as a solvent when the wet ball milling step is performed. Then, a sintering process is performed to make a pre-powder (step 104). The dried powder is placed in an alumina crucible and placed in a high-temperature furnace, for example, at a temperature increase rate of 5 ° C / mi η, at a temperature of 500 ° C to 700 ° C. Simmering treatment takes about 12 hours to 36 hours. The raw powder after the calcination is completed is used as the powder before the sintering process. Next, the calcined powder is ground and ground with alumina, placed in a stamper, and pressed to, for example, 3 50 K g / c m2 to make a green embryo (step 106) °

9285twf2. Pt.d Page 10 593204 _Case No. 91118814_ Year, month and month of revision _ V. Description of the invention (6) Then, the green embryo is placed on a highly thermally conductive metal sheet, and then the highly thermally conductive metal sheet is covered, and this high thermal conductivity The material of the metal sheet includes a metal having a conductivity higher than 10 W / mK, which is, for example, a platinum sheet (step 1 ◦ 8). Next, a sintering process is performed to make ceramics (step 110). The green embryo covered with the high thermally conductive metal sheet above and below is placed in a high-temperature furnace, and stays at a temperature of 850 t to 14 0 ° C for 2 seconds. After sintering for 24 hours to 24 hours, the temperature is lowered to room temperature to obtain a sintered ceramic. Thereafter, a heat treatment process is performed to make the ceramic denser and more stable in structure. After the sintered ceramic is covered with a highly thermally conductive metal sheet, it is placed in a high-temperature furnace, and heated to a temperature of 80 ° C at a heating rate of 1 ° C / mi η to 8 it / mi η, and then 1 The cooling rate from ° C / mi η to 8 ° C / mi η is reduced to room temperature (2 5 ° C). Repeating the temperature rising and lowering steps in this way can obtain a dense and more stable ceramic (step 1 1 2) . In the sintered ceramics, the molar ratios of lithium oxide, aluminum oxide, and silicon oxide are, for example, 1: 1: 2 to 1: 1: 3. In the production of lithium aluminum silicate ceramics, if lithium carbonate, aluminum oxide, and oxide The mixed powder of silicon has not been subjected to pre-powder sintering treatment (steps 100 to 104). When the green sintering process is performed, the lithium carbonate powder will erode the oxides or ceramics during the high temperature reaction. Therefore, in the present invention, the pre-powder is prepared by sintering, so that the lithium carbonate powder is first decomposed to volatilize carbon dioxide, and partially reacts with the silicon dioxide to form a solid solution phase of lithium silicate, which smoothly avoids the lithium carbonate powder. Phenomenon. Please refer to the X-ray diffraction analysis chart of the powder placed before sintering as shown in Figure 2. In FIG. 2, the symbol * indicates Li2Si03, the symbol # indicates Li2Si 2 05, and the symbol + indicates Si02. Please refer to Figure 2 and place the powder at a diffraction angle of 20 = 24 degrees before sintering.

9285 t.wf2. Pt.d Page 11 593204 _Case No. 91118814_ Year Month Revised_ V. Description of the invention (7) and diffraction angle 2 0 = 2 There is a diffraction peak around 7 degrees, and this diffraction The peak is a diffraction peak of lithium silicate (Li2Si 2 05), which means that after sintering, lithium carbonate has reacted with silicon dioxide to form lithium silicate. Moreover, in the sintering process of the present invention, the ceramic can be uniformly heated due to the close contact between the top and bottom of the ceramic with the high thermal conductivity metal sheet. After the sintering process, a good heat treatment process can be used to obtain a denser and more stable ceramic body (step 106 to step 1 12). Hereinafter, Experimental Example 1, Experimental Example 2 and Comparative Example will be specifically described to explain the present invention in detail. Experimental Example 1 Lithium carbonate, alumina, and silicon oxide powders having a molar ratio of 1: 1: 2 were uniformly mixed in a wet ball milling method, and then dried in an oven. Then, put the dried powder into an alumina crucible and place it in a high-temperature furnace, and heat it to a temperature of 5 50 ° C at a heating rate of 5 ° C / mi η, and perform a calcination treatment for 2 4 hours. . The calcined powder was ground and ground with alumina, placed in a stamper, and pressed under a pressure of 350 Kg / cm2 to make a green embryo. Then, the top and bottom of the green embryo were closely adhered to the high thermal conductivity metal sheet, and placed in a high-temperature furnace, and first heated to a temperature of 5 ° C / mi η to 1 150 ° C, and then 1 ° C / mi The heating rate of η is heated to 1 300 ° C, and it stays for 12 hours for sintering, and then the temperature is reduced to room temperature at a cooling rate of 5 ° C / in i η, and the sintered ceramic can be obtained. Experimental Example 2 Lithium carbonate, alumina and silicon oxide powders having a molar ratio of 1: 1: 2 were evenly mixed by a wet ball milling method, and then dried in an oven. Then, put the dried powder into an alumina crucible and place it in a high-temperature furnace.

9285twf2.pt.d Page 12 593204 _Case No. 91118814_ Year Month Amendment _ V. Description of the invention (8) The temperature rising rate of ° C / mi η is heated to a temperature of 5 5 0 ° C and subjected to sintering treatment 2 4 hours. The calcined powder was ground and ground with alumina, placed in a stamper, and pressed under a pressure of 350 Kg / cm2 to make a green embryo. Then, the top and bottom of the raw embryo were closely adhered to the high thermal conductivity metal sheet, and placed in a high-temperature furnace, first heated to a temperature of 1 150 ° C at a heating rate of 5 ° C / mi η, and then 1 ° C / mi The heating rate of η is heated to 1 300 ° C, and it stays for 12 hours for sintering, and then the temperature is reduced to room temperature at a cooling rate of 5 ° C / mi η, and the sintered ceramic can be obtained. After that, a heat treatment process is performed, after the sintered ceramic is covered with a high thermal conductivity metal sheet, it is placed in a high-temperature furnace and heated to a temperature of 5 ° C / mi η to 800 ° C, and then 5 ° C. The cooling rate of / mi η is reduced to room temperature, and the temperature rising and falling steps are repeated four times to obtain dense and more stable ceramics. Comparative Example Lithium carbonate, alumina, and silicon oxide powders having a molar ratio of 1: 1: 2 were uniformly mixed in a wet ball mill, and then dried in an oven. Then, put the dried powder into an alumina crucible and place it in a high-temperature furnace, and heat it to a temperature of 5 50 ° C at a heating rate of 5 ° C / mi η, and perform a calcination treatment for 2 4 hours. . The calcined powder was ground and ground with alumina, placed in a stamper, and pressed under a pressure of 350 Kg / cm2 to make a green embryo. Then, directly place the green embryo in a high-temperature furnace, first heat it to 1150 ° C at a heating rate of 5 ° C / min, and then heat it to 1 300 ° C at a heating rate of 1 ° C / mi η, and leave it It takes 12 hours to perform sintering, and then decreases to room temperature at a temperature lowering rate of 5 ° C / mi η, and a sintered ceramic can be obtained. Next, the comparison results of Experimental Example 1, Experimental Example 2 and Comparative Example will be described. Figures 3A, 3B, and 3C show Experimental Example 1, Experimental Example 2, and

9285twf2.ptd Page 13 593204 _Case No. 91111814_ Month and Day__ V. Description of the invention (9) Scanning electron microscope photograph of the lithium aluminum silicate ceramic material of the comparative example. As shown in Figures 3A and 3C, in the sintering process, the sintered ceramics obtained by covering the high thermally conductive metal sheet up and down are larger than the crystals and ingots of the sintered ceramics obtained without the high thermally conductive metal sheet The structures are more complete and even sentences. Therefore, in the sintering process, the high thermal conductivity metal sheet is closely adhered to the top and bottom of the green embryo, so that the green embryo can be heated more uniformly, and the ceramic has a more uniform structure. Moreover, as shown in Figures 3A and 3B, after the sintering process, the ceramics after the heat treatment process (Experiment Example 2) are compared with the ceramics without the heat treatment process (Experiment Example 1), and their structure is more Dense and stable. This is because during the slowly increasing temperature of the heat treatment process, the grains can grow again, heal and grow, and a denser and more stable ceramic can be formed. Figure 4 shows the average expansion coefficient values and standard deviations obtained by measuring the lithium aluminosilicate ceramics of Experimental Example 1, Experimental Example 2 and Comparative Example with a thermomechanical analyzer. In Fig. 4, the symbol # indicates Experimental Example 1, the symbol ▲ indicates Experimental Example 2, and the symbol indicates Comparative Example. As shown in the results of Figure 4, the average expansion coefficient values of Experimental Example 1, Experimental Example 2 and Comparative Examples are -9. 6 4 X 1 0 -6 / ° C, -8, 63x10-6 / ° C and -10.15xl0_6 / ° C. Therefore, it can be seen from Fig. 4 that Experimental Example 2 has a more average and stable expansion coefficient than Experimental Example 1 and Comparative Example. Figure 5 shows the average expansion coefficient values and standard deviations of the lithium aluminosilicate ceramics of Experimental Example 1 measured at a sintering temperature of 130 ° C and different residence times using a thermomechanical analyzer. As shown in Fig. 5, the average expansion coefficient value of the lithium aluminum silicate ceramic material of Experimental Example 1 increases with the increase of the residence time and reaches a fixed value. Among them, the maximum average expansion coefficient value of the lithium aluminosilicate ceramics of Experimental Example 1 can reach -1 0.62 X 1 0-V ° C.

9285twf2.ptd Page 14 593204 _Case No. 91118814_ Year Month Day__ V. Description of the invention (10) Figures 6A and 6B are lithium aluminum silicates showing Experiment 1 and Experiment 2 respectively Ceramic expansion curve. Figures 7A and 7B show the ceramic expansion curves and hysteresis of the lithium aluminosilicate ceramics of Experimental Example 1 and Experimental Example 2, respectively, after repeated temperature rise and fall processes. As shown in Figure 6A, Figure 6B, Figure 7A and Figure 7B, ceramics after heat treatment can obtain a more linear and stable expansion coefficient, and can improve the process of repeated temperature rise and fall , Hysteresis and nonlinear instability of the expansion curve. The invention uses a solid state sintering method to produce ceramic materials. In all heating processes (including ceramic sintering and heat treatment), a high thermally conductive metal sheet is covered to help uniform ceramic heating temperature field. The high thermally conductive metal sheet must be closely attached to the ceramic to make the thermal conductivity Hot Jun sentence. In addition, after the sintering process, a heat treatment process is performed to improve the thermal expansion retardation and instability of the ceramic. Although, the present invention directly synthesizes lithium aluminosilicate ceramics from powders of lithium carbonate, aluminum oxide, and silicon oxide, which may cause lithium carbonate to attack oxides or ceramics during high temperature reactions. However, in the present invention, the sintering process of the pre-powder is performed before the sintering process, so that the oxide or ceramic can be prevented from being attacked by lithium carbonate during the high temperature reaction, and the sintering process of the ceramic can be successfully completed. In addition, in the ceramic sintering process, the high-thermal-conductivity metal is tightly covered on the top and bottom of the ceramic green embryo, so that the heat can be introduced into the ceramic green embryo, so that the green embryo grains are uniformly heated during the sintering process. In order to reduce the anisotropic effect between the crystals, the overall ceramic grains are more randomly arranged and distributed. In addition, the subsequent heat treatment process can make the grains heal and grow again, and form a more dense and more stable ceramic. In the above embodiment of the present invention, a synthetic lithium aluminum silicate ceramic is taken as an example.

9285t.wf2.ptd Page 15 593204 _Case No. 91118814_ Year Month Amendment _ V. Description of the Invention (11) Of course, the method of the present invention is not limited to synthetic lithium aluminosilicate ceramics, but can also be applied to Manufacture of other types of ceramics. For example, depending on the ceramic material to be produced, different raw material powders can be selected and mixed together, followed by sequential mixing, sintering, production of green embryos, and bonding of high thermal conductivity metal sheets on top of the green embryos, The steps of sintering and heat-treating to densify the ceramics to produce ceramics with better properties. The raw material powder is not limited to the lithium carbonate, alumina, and silicon oxide used in the embodiments of the present invention, but also includes volatilization during high temperature sintering, or ceramics with uniformity to heat sensitive, and even no special requirements in the general process. The raw material powder is, for example, tungsten oxide, hafnium oxide, lithium oxide, niobium oxide, vanadium oxide, yttrium oxide, barium carbonate, titanium oxide, and the like. By selecting raw material powders with different compositions and using the method of the present invention, different ceramic materials can be manufactured, such as yttrium vanadate ceramic materials, zirconium tungstate ceramic materials, lithium niobate ceramic materials and barium titanate ceramic materials. Materials, etc. Although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various changes and decorations without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application.

9285twf2.ptd Page 16 593204 _Case No. 91118814_ Year Month Amendment _ Brief Description of Drawings Figure 1 shows the flow chart of the steps of the method for manufacturing the ceramic material of the present invention. Figure 2 shows an X-ray diffraction analysis chart of the powder placed before sintering. Figure 3A shows a scanning electron microscope (SEM) photograph of the lithium aluminosilicate ceramic material of Experimental Example 1. Fig. 3B shows a scanning electron microscope photograph of the lithium aluminosilicate ceramic material of Experimental Example 2. Fig. 3C shows a scanning electron microscope photograph of a lithium aluminum silicate ceramic material of a comparative example. Figure 4 shows the average expansion coefficient values and standard deviations obtained by measuring the lithium aluminosilicate ceramic materials of Experimental Example 1, Experimental Example 2 and Comparative Example with a thermomechanical analyzer. Figure 5 shows the average expansion coefficient and standard deviation of different retention times of the lithium aluminum silicate ceramic material of Experimental Example 1 measured by a thermomechanical analyzer at a sintering temperature of 130 ° C. FIG. 6A is a graph showing the expansion curve of the lithium aluminosilicate ceramic of Experimental Example 1. FIG. Fig. 6B is a graph showing the expansion curve of the lithium aluminosilicate ceramic of Experimental Example 2. Figure 7A is a schematic diagram showing the ceramic expansion curve and hysteresis of the lithium aluminosilicate ceramics of Experimental Example 1 after repeated temperature rise and fall processes. Figure 7B is a schematic diagram showing the ceramic expansion curve and hysteresis of the lithium aluminosilicate ceramics of Experimental Example 2 after repeated temperature rise and fall processes.

9285twf2.ptd Page 17

Claims (1)

593204 _Case No. 91118814_Year_Month__ VI. Scope of patent application1. A method for manufacturing lithium aluminum silicate ceramics, the method includes the following steps: using lithium carbonate, alumina, and mixed powder of silicon oxide as a Raw material powder, after mixing and grinding the raw material powder, and drying the raw material powder; subjecting the raw material powder to a firing process to form the raw material powder into a pre-powder powder; pressing the pre-powder powder into a raw embryo; A high thermal conductivity metal sheet is bonded to the upper surface and the lower surface of the embryo; a sintering process is performed to sinter the green embryo into a ceramic; and a heat treatment process is performed on the ceramic. 2. The method for manufacturing a lithium aluminum silicate ceramic according to item 1 of the scope of the patent application, wherein the method of mixing and grinding the raw material powder includes a ball milling method. 3. The manufacturing method of lithium aluminosilicate ceramics as described in item 1 of the scope of the patent application, wherein the molar ratios of lithium carbonate, alumina and silicon oxide include 1: 1 to 2 between. 4. The method for manufacturing a lithium aluminosilicate ceramic according to item 1 of the scope of the patent application, wherein the material of the highly thermally conductive metal sheet includes a metal having a conductivity higher than 10 W / mK. 5. The method for manufacturing a lithium aluminum silicate ceramic as described in the entire item of the scope of patent application, wherein the highly thermally conductive metal sheet includes a platinum sheet. 6. The manufacturing method of lithium aluminosilicate ceramics according to item 1 of the scope of patent application, wherein the molar ratios of lithium oxide, aluminum oxide and silicon oxide in the ceramic include 1: 1: 2 to 1 ·· 1 : Between 3. 9285twf2.ptd Page 18 593204 _ Case No. 91118814 _ __ Date of application for patent 7. The manufacturing method of lithium aluminosilicate ceramics as described in item 1 of the scope of patent application, wherein the firing process is Temperatures range from 500 ° C to 700 ° C. 8. The method for manufacturing a lithium aluminosilicate ceramic according to item 1 of the scope of patent application, wherein the residence time of the sintering process includes between 12 hours and 36 hours. 9. The method for manufacturing a lithium aluminosilicate ceramic according to item 1 of the scope of patent application, wherein the temperature of the sintering process includes between 850 ° C and 14 0 ° C. 10. The method for manufacturing a lithium aluminosilicate ceramic according to item 1 of the scope of the patent application, wherein the residence time of the sintering process includes between 2 hours and 24 hours. 1 1. The method for manufacturing a lithium aluminosilicate ceramic as described in item 1 of the scope of patent application, wherein the steps of the heat treatment process include: (a) heating the ceramic to a first temperature; (b) making the ceramic Cooling down from the first temperature to a second temperature; and (c) repeating the steps (a) and (b). 1 2 · The method for manufacturing a lithium aluminosilicate ceramic as described in item 1 of the scope of patent application, wherein the heating process has a heating rate between 1 ° C / m i η and 8 ° C / m i η. 1 3 · The method for manufacturing a lithium aluminosilicate ceramic as described in item 1 of the scope of patent application, wherein the temperature reduction rate of the heat treatment process is between 1 ° C / m i η and 8 ° C / m i η. 1 4 · The method for manufacturing a lithium aluminosilicate ceramic according to item 1 of the scope of patent application, wherein the first temperature includes 80 ° C, and the second temperature includes 2 5 9285twf2.ptd Page 19 593204 _Case No. 91118814_ Year Month Amendment _ 々, scope of patent application ° c. 15. A method for manufacturing a ceramic material, the method includes the following steps: providing a pre-powder; pressing the pre-powder into a green embryo; and attaching a high thermal conductivity metal sheet on the upper surface and the lower two sides of the green embryo Performing a sintering process to sinter the green embryo into a ceramic; and performing a heat treatment process on the ceramic. 16. The method for manufacturing a ceramic material according to item 15 of the scope of the patent application, wherein the step of preparing the pre-powder comprises: using a mixed powder including at least one ingredient as a raw material powder; after grinding and grinding the raw material powder And drying the raw material powder; and performing a calcination process on the raw material powder to form the raw material powder into the pre-powder. 1 7. The method for manufacturing a ceramic material according to item 15 of the scope of the patent application, wherein the raw material powder is at least selected from a ceramic raw material powder that has a volatilization phenomenon at high temperature sintering, and a ceramic raw material powder whose ceramic uniformity is sensitive to heat One or more of the groups of ceramic raw material powders with no special requirements in general processes. 18. The method for manufacturing a ceramic material as described in item 15 of the scope of patent application, wherein the material of the highly thermally conductive metal sheet includes a metal having a conductivity higher than 10 W / mK. 19. The manufacturer of ceramic materials as described in item 15 of the scope of patent application 9285twf2.ptd Page 20 593204 _ Case No. 91118814_ year month date__ Six, the patent application method, wherein the steps of the heat treatment process include: (a) heating the ceramic to a first temperature; (b) making the The ceramic is cooled from the first temperature to a second temperature; and (c) the steps (a) and (b) are repeated. 20. The method for manufacturing a ceramic material according to item 15 of the scope of the patent application, wherein the temperature rise and fall rate of the heat treatment process is between 1 ° C / m i η and 8 ° C / m i η. 9285t.wf2. Pt.d Page 21