Black quartz glass material and preparation method thereof

Abstract

The invention discloses a black quartz glass material and a preparation method thereof, and relates to the technical field of quartz glass preparation, the black quartz glass material is prepared from the following raw materials by weight: 0.8 wt%-3.8 wt% of a trace element additive, 0.01 wt%-0.05 wt% of a fluxing agent, and the balance of high purity quartz sand; the trace element additive is prepared from the following components in parts by weight: 0.03 to 0.05 part of strontium nitrate, 1 to 3 parts of titanium nitrate, 1 to 2 parts of manganous nitrate, 2 to 3 parts of ferric nitrate, 0.1 to 0.3 part of soluble rare earth salt, 0.05 to 0.1 part of nickel nitrate, 0.03 to 0.05 part of chromic nitrate, 0.05 to 0.08 part of niobium oxalate and 0.03 to 0.05 part of tantalum chloride. The glass material is good in color uniformity, stable in optical performance, simple in preparation process and low in thermal expansion coefficient.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of quartz glass, and particularly to a black quartz glass material and a preparation method thereof. Background Art

[0002] Quartz glass, with its high purity, low coefficient of thermal expansion, good chemical stability, high electric breakdown strength, excellent high-temperature resistance performance and optical properties, is widely used in the manufacturing of semiconductors, electric light sources, semiconductor communication devices, lasers, optical instruments, laboratory instruments, electrical equipment, medical equipment, and high-temperature and corrosion-resistant chemical instruments, as well as industrial fields such as chemical engineering, electronics, metallurgy, building materials, and national defense. However, traditional quartz glass mostly appears colorless and transparent or translucent, and in specific application scenarios such as light-shielding components of optical instruments and optical elements for absorbing light in specific wavelength bands, it cannot meet the actual requirements.

[0003] Currently, the preparation of colored quartz glass is mostly achieved by adding colorants. However, for black quartz glass, there are many problems in the existing preparation technologies. The conventional method of adding black color masterbatch not only easily leads to poor color uniformity but also has poor compatibility between the color masterbatch and the quartz glass matrix, affecting the overall performance of the glass. The technology of preparing black quartz glass by adding trace elements is not yet mature, facing problems such as uneven dispersion of trace elements and difficult precise control of chemical reactions, resulting in unstable optical properties of the prepared black quartz glass, complex preparation processes, and high costs, which severely limit its large-scale production and application.

[0004] To solve the above problems, Chinese Patent Publication No. CN116323503A discloses a black quartz glass, a manufacturing method of the black quartz glass, and a product including a black quartz glass component using the above black quartz glass. The above black quartz glass has a composition of 63% to 65% by mass of SiO2, 18% to 24% by mass of TiO2, and 12% to 17% by mass of Al2O3 (the total of SiO2, TiO2, and Al2O3 is 100% by mass). The above manufacturing method includes: mixing 63% to 65% by mass of SiO2 powder, 18% to 24% by mass of TiO2 powder, and 12% to 17% by mass of Al2O3 powder, filling the mixed powder into a mold, and then melting it at a maximum temperature of 1700°C to 1900°C in an oxygen-free atmosphere and cooling it to room temperature to obtain the above black quartz glass. This invention provides a black quartz glass with excellent light-shielding properties, no pollution during the use process, sufficient color uniformity during large-scale production, and capable of manufacturing large ingots, a method for manufacturing the black quartz glass with excellent productivity even for large ingots, and a black quartz glass product using the above black quartz glass. However, its color uniformity and optical property stability still need to be further improved.

[0005] It can be seen that developing a black quartz glass material with good color uniformity, stable optical properties, simple preparation process, and low coefficient of thermal expansion, as well as its preparation method, meets the market demand, has broad market value and application prospects, and is of great significance for promoting the development of the black quartz glass material field. Summary of the Invention

[0006] The purpose of the present invention is to provide a black quartz glass material with good color uniformity, stable optical properties, simple preparation process, and low coefficient of thermal expansion, as well as its preparation method, in order to overcome the deficiencies of the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a black quartz glass material is made from the following raw materials by weight percentage: trace element additive 0.8wt%-3.8wt%, flux 0.01wt%-0.05wt%, and the balance is high-purity quartz sand; the trace element additive includes the following components by weight: strontium nitrate 0.03-0.05 parts, titanium nitrate 1-3 parts, manganese nitrate 1-2 parts, iron nitrate 2-3 parts, soluble rare earth salt 0.1-0.3 parts, nickel nitrate 0.05-0.1 parts, chromium nitrate 0.03-0.05 parts, niobium oxalate 0.05-0.08 parts, tantalum chloride 0.03-0.05 parts.

[0008] Preferably, the flux is a mixture of boron oxide and lanthanum oxide in a mass ratio of (1-3):1.

[0009] Preferably, the soluble rare earth salt is a mixture of praseodymium nitrate, cerium nitrate, gadolinium nitrate, and dysprosium nitrate in a mass ratio of 1:(0.8-1.2):(1-2):0.6.

[0010] Preferably, the average particle size of the high-purity quartz sand is 30-100 mesh.

[0011] Preferably, the impurity content in the high-purity quartz sand is less than 10 ppm, and the silicon dioxide content is greater than 99.998wt%.

[0012] Another object of the present invention is to provide a preparation method for the black quartz glass material, which includes the following steps: Step S1, mixing the components of the trace element additive uniformly by weight to obtain a metal salt mixture, dissolving it in deionized water to form a metal salt mixture solution, then adding 30-40% of citric acid based on the total mass of the metal salt mixture, stirring magnetically at 65-75° C. for 2-4 hours, adjusting the pH of the solution to 3.5-4.0 with aqueous ammonia to form a stable sol system; adding ethylene glycol as a crosslinking agent at 15% of the mass of the sol, continuing stirring for 0.8-1.2 hours, and then transferring to an oven, drying at 130° C. for 20-24 hours to form a wet gel; crushing the wet gel and adding it to a spray dryer for spray drying to obtain a spherical precursor powder with an average particle size of 10-20 μm; calcining and activating to obtain the trace element additive; Step S2: After the trace element additives, flux and high-purity quartz sand are fully mixed, they are dried and expanded by a sand baking machine, and then screened and magnetically separated to remove metal impurities, and then put into a continuous melting furnace for smelting, drawn into shape, and finally heat treated to obtain a black quartz glass material.

[0013] Preferably, the mass ratio of the total mass of the metal salt mixture to water in the metal salt mixture solution is (12-20):(80-88).

[0014] Preferably, the inlet temperature of the spray dryer is 210-230°C, and the outlet temperature is 90-110°C.

[0015] Preferably, the calcination activation is specifically: heating to 640-670°C at a heating rate of 5-8°C / min, and keeping the temperature for 3-5 hours.

[0016] Preferably, the temperature of the drying and puffing in step S2 is 1190-1240°C.

[0017] Preferably, the smelting temperature in step S2 is 1880-1980°C.

[0018] Preferably, the heat treatment in step S2 is annealing treatment, the annealing temperature is 580-630° C., and the insulation time is 1-2 h.

[0019] Due to the application of the above technical solution, the present invention has the following beneficial effects: (1) The method for preparing the black quartz glass material disclosed in the present invention has simple process, convenient operation, high preparation efficiency and qualified rate of finished products, strong equipment versatility, no need for special equipment, greatly reducing the cost of equipment purchase and maintenance, easy large-scale industrial production, little impact on the environment, and high promotion and application value.

[0020] (2) The black fused silica glass material disclosed by the present invention is made from the following raw materials by weight percentage: trace element additives 0.8wt%-3.8wt%, flux 0.01wt%-0.05wt%, and the balance is high-purity quartz sand; the trace element additives include the following components by weight: strontium nitrate 0.03-0.05 parts, titanium nitrate 1-3 parts, manganese nitrate 1-2 parts, iron nitrate 2-3 parts, soluble rare earth salt 0.1-0.3 parts, nickel nitrate 0.05-0.1 parts, chromium nitrate 0.03-0.05 parts, niobium oxalate 0.05-0.08 parts, tantalum chloride 0.03-0.05 parts. Through the mutual cooperation and joint action of each raw material and component, the prepared black fused silica glass material has good color uniformity, stable optical properties, and low thermal expansion coefficient. Through the reasonable selection of the composition of the trace element additives, strontium, niobium, tantalum and other multi-elements are introduced for the first time to assist in color development synergistically. They cooperate with other elements or substances that make the glass black, which can make the color of the black glass more pure and uniform, and better achieve the required low light transmittance effect. The flux is composed of boron oxide and lanthanum oxide mixed in a mass ratio of (1-3):1; by adding the flux with the above ratio and cooperating with other raw materials, the melting speed can be effectively increased, the clarification and homogenization effects of the glass can be improved, and further the optical properties of the prepared black fused silica glass material are better and the performance stability is better.

[0021] (3) The black fused silica glass material disclosed by the present invention realizes the uniform dispersion of trace elements and precisely controls the chemical reactions during the smelting process through the sol-gel method and spray drying technology. The prepared black fused silica glass has uniform color and no visible color difference to the naked eye, meeting the strict requirements for color consistency in high-end optical applications. Specific Embodiments

[0022] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0023] The mass percentage concentration of ammonia water used in each embodiment of the present invention is 25%.

[0024] Example 1

[0025] A black fused silica glass material is made from the following raw materials by weight percentage: trace element additives 0.8wt%, flux 0.01wt%, and the balance is high-purity quartz sand; the trace element additives include the following components by weight: strontium nitrate 0.03 parts, titanium nitrate 1 part, manganese nitrate 1 part, iron nitrate 2 parts, soluble rare earth salt 0.1 part, nickel nitrate 0.05 part, chromium nitrate 0.03 part, niobium oxalate 0.05 part, tantalum chloride 0.03 part; the flux is composed of boron oxide and lanthanum oxide mixed in a mass ratio of 1:1.

[0026] The soluble rare earth salt is a mixture of praseodymium nitrate, cerium nitrate, gadolinium nitrate and dysprosium nitrate in a mass ratio of 1:0.8:1:0.6; the average particle size of the high-purity quartz sand is 30 meshes; the impurity content in the high-purity quartz sand is less than 10ppm, and the silicon dioxide content is greater than 99.998wt%.

[0027] A method for preparing the black quartz glass material comprises the following steps: Step S1, mixing the components of the trace element additive uniformly by weight to obtain a metal salt mixture, dissolving it in deionized water to form a metal salt mixture solution, then adding 30% of the total mass of the metal salt mixture of citric acid thereto, stirring magnetically at 65 ° C for 2 hours, adjusting the solution pH to 3.5 with ammonia water to form a stable sol system; adding ethylene glycol as a crosslinking agent at 15% of the mass of the sol, continuing to stir for 0.8 hours, and then transferring to an oven, drying at 130 ° C for 20 hours to form a wet gel; crushing the wet gel and adding it to a spray dryer for spray drying to obtain a spherical precursor powder with an average particle size of 10 μm; after calcination and activation, the trace element additive is obtained; Step S2: After the trace element additives, flux and high-purity quartz sand are fully mixed, they are dried and expanded by a sand baking machine, and then screened and magnetically separated to remove metal impurities, and then put into a continuous melting furnace for smelting, drawn into shape, and finally heat treated to obtain a black quartz glass material.

[0028] The mass ratio of the total mass of the metal salt mixture to water in the metal salt mixture solution is 12:88; the inlet temperature of the spray dryer is 210°C, and the outlet temperature is 90°C; the calcination activation is specifically: heating to 640°C at a heating rate of 5°C / min and keeping warm for 3 hours; the drying and puffing temperature in step S2 is 1190°C; the smelting temperature in step S2 is 1880°C; the heat treatment in step S2 is annealing treatment, the annealing temperature is 580°C, and the insulation time is 1h.

[0029] Example 2

[0030] A black quartz glass material is made of the following raw materials in percentage by weight: 1.5wt% of a trace element additive, 0.02wt% of a flux, and the balance being high-purity quartz sand; the trace element additive comprises the following components in percentage by weight: 0.035 parts of strontium nitrate, 1.5 parts of titanium nitrate, 1.2 parts of manganese nitrate, 2.2 parts of iron nitrate, 0.15 parts of a soluble rare earth salt, 0.06 parts of nickel nitrate, 0.035 parts of chromium nitrate, 0.06 parts of niobium oxalate, and 0.035 parts of tantalum chloride.

[0031] The flux is composed of boron oxide and lanthanum oxide mixed in a mass ratio of 1.5:1; the soluble rare earth salt is composed of praseodymium nitrate, cerium nitrate, gadolinium nitrate, and dysprosium nitrate mixed in a mass ratio of 1:0.9:1.2:0.6; the average particle size of the high-purity quartz sand is 50 mesh; the impurity content in the high-purity quartz sand is less than 10 ppm, and the silicon dioxide content is greater than 99.998 wt%.

[0032] A method for preparing the black quartz glass material includes the following steps: Step S1: Mix the components of the trace element additive evenly by weight to obtain a metal salt mixture, dissolve it in deionized water to form a metal salt mixture solution, then add citric acid accounting for 33% of the total mass of the metal salt mixture thereto, magnetically stir at 67 °C for 2.5 h, and adjust the pH of the solution to 3.7 with ammonia water to form a stable sol system; add ethylene glycol accounting for 15% of the sol mass as a cross-linking agent, continue stirring for 0.9 h, then transfer it to an oven and dry at 130 °C for 21 h to form a wet gel; crush the wet gel and add it to a spray dryer for spray drying to obtain spherical precursor powder with an average particle size of 13 μm; after calcination and activation, obtain the trace element additive; Step S2: After fully mixing the trace element additive, the flux, and the high-purity quartz sand, use a sand roaster to dry and expand it, then perform screening and magnetic separation to remove metal impurities, and then put it into a continuous melting furnace for melting, drawing and forming, and finally perform heat treatment to obtain the black quartz glass material.

[0033] The mass ratio of the total mass of the metal salt mixture to water in the metal salt mixture solution is 15:85; the inlet temperature of the spray dryer is 215 °C, and the outlet temperature is 95 °C; the specific calcination and activation are as follows: heat up at a heating rate of 6 °C / min to 650 °C and hold for 3.5 h; the temperature of the drying and expansion in Step S2 is 1210 °C; the temperature of the melting in Step S2 is 1900 °C; the heat treatment in Step S2 is annealing treatment, the annealing temperature is 590 °C, and the holding time is 1.2 h.

[0034] Example 3

[0035] A black quartz glass material is made from the following raw materials by weight percentage: 2.3 wt% of trace element additive, 0.03 wt% of flux, and the balance is high-purity quartz sand; the trace element additive includes the following components by weight: 0.04 part of strontium nitrate, 2 parts of titanium nitrate, 1.5 parts of manganese nitrate, 2.5 parts of iron nitrate, 0.2 part of soluble rare earth salt, 0.08 part of nickel nitrate, 0.04 part of chromium nitrate, 0.065 part of niobium oxalate, and 0.04 part of tantalum chloride.

[0036] The flux is composed of boron oxide and lanthanum oxide mixed in a mass ratio of 2:1; the soluble rare earth salt is composed of praseodymium nitrate, cerium nitrate, gadolinium nitrate, and dysprosium nitrate mixed in a mass ratio of 1:1:1.5:0.6; the average particle size of the high-purity quartz sand is 60 mesh; the impurity content in the high-purity quartz sand is less than 10 ppm, and the silicon dioxide content is greater than 99.998 wt%.

[0037] A method for preparing the black quartz glass material includes the following steps: Step S1: Mix the components of the trace element additive evenly by weight to obtain a metal salt mixture, dissolve it in deionized water to form a metal salt mixture solution, then add 35% of the total mass of the metal salt mixture of citric acid thereto, magnetically stir for 3 h at 70 °C, and adjust the pH of the solution to 3.8 with ammonia water to form a stable sol system; add ethylene glycol as a crosslinking agent according to 15% of the sol mass, continue stirring for 1 hour and then transfer to an oven, dry at 130 °C for 22 hours to form a wet gel; crush the wet gel and add it to a spray dryer for spray drying to obtain spherical precursor powder with an average particle size of 15 μm; after calcination activation, obtain the trace element additive; Step S2: After fully mixing the trace element additive, the flux, and the high-purity quartz sand, use a roasting machine to dry and expand it, then perform screening and magnetic separation to remove metal impurities, and then put it into a continuous melting furnace for melting, drawing into shape, and finally performing heat treatment to obtain the black quartz glass material.

[0038] The mass ratio of the total mass of the metal salt mixture to water in the metal salt mixture solution is 16:84; the inlet temperature of the spray dryer is 220 °C, and the outlet temperature is 100 °C; the specific calcination activation is: heating at a heating rate of 6.5 °C / min to 655 °C and holding for 4 hours; the temperature of the drying and expansion in Step S2 is 1220 °C; the melting temperature in Step S2 is 1940 °C; the heat treatment in Step S2 is annealing treatment, the annealing temperature is 610 °C, and the holding time is 1.5 h.

[0039] Example 4

[0040] A black quartz glass material is made from the following raw materials by weight percentage: 3.2 wt% of trace element additive, 0.04 wt% of flux, and the balance is high-purity quartz sand; the trace element additive includes the following components by weight: 0.045 part of strontium nitrate, 2.5 parts of titanium nitrate, 1.8 parts of manganese nitrate, 2.8 parts of iron nitrate, 0.25 part of soluble rare earth salt, 0.09 part of nickel nitrate, 0.045 part of chromium nitrate, 0.075 part of niobium oxalate, and 0.045 part of tantalum chloride.

[0041] The flux is a mixture of boron oxide and lanthanum oxide in a mass ratio of 2.5:1; the soluble rare earth salt is a mixture of praseodymium nitrate, cerium nitrate, gadolinium nitrate and dysprosium nitrate in a mass ratio of 1:1.1:1.8:0.6; the average particle size of the high-purity quartz sand is 90 mesh; the impurity content in the high-purity quartz sand is less than 10ppm, and the silicon dioxide content is greater than 99.998wt%.

[0042] A method for preparing the black quartz glass material comprises the following steps: Step S1, mixing the components of the trace element additive uniformly by weight to obtain a metal salt mixture, dissolving it in deionized water to form a metal salt mixture solution, then adding 38% of citric acid in the total mass of the metal salt mixture, stirring it magnetically at 73° C. for 3.5 hours, adjusting the pH of the solution to 3.8 with ammonia water to form a stable sol system; adding ethylene glycol as a cross-linking agent at 15% of the mass of the sol, continuing to stir for 1.1 hours, and then transferring it to an oven, drying it at 130° C. for 23 hours to form a wet gel; crushing the wet gel and adding it to a spray dryer for spray drying to obtain a spherical precursor powder with an average particle size of 18 μm; after calcination and activation, obtaining the trace element additive; Step S2: After the trace element additives, flux and high-purity quartz sand are fully mixed, they are dried and expanded by a sand baking machine, and then screened and magnetically separated to remove metal impurities, and then put into a continuous melting furnace for smelting, drawn into shape, and finally heat treated to obtain a black quartz glass material.

[0043] The mass ratio of the total mass of the metal salt mixture to water in the metal salt mixture solution is 18:82; the inlet temperature of the spray dryer is 225°C, and the outlet temperature is 105°C; the calcination activation is specifically: heating to 665°C at a heating rate of 7.5°C / min, and keeping warm for 4.5 hours; the drying and puffing temperature in step S2 is 1230°C; the smelting temperature in step S2 is 1970°C; the heat treatment in step S2 is annealing treatment, the annealing temperature is 620°C, and the insulation time is 1.8h.

[0044] Example 5

[0045] A black quartz glass material is made of the following raw materials in percentage by weight: 3.8wt% of trace element additives, 0.05wt% of flux, and the balance is high-purity quartz sand; the trace element additives include the following components in percentage by weight: 0.05 parts of strontium nitrate, 3 parts of titanium nitrate, 2 parts of manganese nitrate, 3 parts of iron nitrate, 0.3 parts of soluble rare earth salt, 0.1 parts of nickel nitrate, 0.05 parts of chromium nitrate, 0.08 parts of niobium oxalate, and 0.05 parts of tantalum chloride.

[0046] The flux is composed of boron oxide and lanthanum oxide mixed in a mass ratio of 3:1; the soluble rare earth salt is composed of praseodymium nitrate, cerium nitrate, gadolinium nitrate, and dysprosium nitrate mixed in a mass ratio of 1:1.2:2:0.6; the average particle size of the high-purity quartz sand is 100 mesh; the impurity content in the high-purity quartz sand is less than 10 ppm, and the silicon dioxide content is greater than 99.998 wt%.

[0047] A preparation method of the black quartz glass material includes the following steps: Step S1: Mix each component of the trace element additive evenly by weight to obtain a metal salt mixture, dissolve it in deionized water to form a metal salt mixture solution, then add citric acid accounting for 40% of the total mass of the metal salt mixture thereto, magnetically stir at 75 °C for 4 h, and adjust the pH of the solution to 4.0 with ammonia water to form a stable sol system; add ethylene glycol accounting for 15% of the sol mass as a cross-linking agent, continue stirring for 1.2 hours, then transfer it to an oven and dry at 130 °C for 24 hours to form a wet gel; crush the wet gel and add it to a spray dryer for spray drying to obtain spherical precursor powder with an average particle size of 20 μm; after calcination and activation, obtain the trace element additive; Step S2: After fully mixing the trace element additive, the flux, and the high-purity quartz sand, use a roasting sand machine for drying and expansion, then perform screening and magnetic separation to remove metal impurities, and then put it into a continuous melting furnace for melting, drawing and forming, and finally perform heat treatment to obtain the black quartz glass material.

[0048] The mass ratio of the total mass of the metal salt mixture to water in the metal salt mixture solution is 20:80; the inlet temperature of the spray dryer is 230 °C, and the outlet temperature is 110 °C; the specific calcination and activation are as follows: heat up to 670 °C at a heating rate of 8 °C / min and hold for 5 hours; the temperature of the drying and expansion in Step S2 is 1240 °C; the temperature of the melting in Step S2 is 1980 °C; the heat treatment in Step S2 is annealing treatment, the annealing temperature is 630 °C, and the holding time is 2 h.

[0049] Comparative Example 1 A black quartz glass material and its preparation method are basically the same as those in Example 1, except that strontium nitrate and niobium oxalate are not added, and there is no heat treatment process.

[0050] Comparative Example 2 A black quartz glass material and its preparation method are basically the same as those in Example 1, except that tantalum chloride and soluble rare earth salt are not added, and in Step S1, each component is directly dissolved in water to form an aqueous solution.

[0051] To further illustrate the beneficial technical effects of the black quartz glass materials involved in the embodiments of the present invention, relevant performance tests were conducted on the black quartz glass materials involved in Embodiments 1-5 and Comparative Examples 1-2. The test methods are as follows: (1)Absorbance test method: Use a double-beam ultraviolet-visible-near-infrared spectrophotometer (wavelength range covering 200-2500 nm); by measuring the transmittance (T) of the sample in the 400-1200 nm band, calculate the absorbance according to the formula A = -log 10 (T). During the test, scan the 400-1200 nm band with a 2 nm step size, and measure each sample 3 times and take the average value. During the test, control the thickness of each sample to be 2 mm; (2)Color uniformity and color difference (ΔE) test method: Use a high-precision color difference meter (CIELAB system), equipped with an integrating sphere attachment to eliminate the influence of surface reflection; based on the CIELAB color space, by measuring the L* (lightness), a* (red-green axis), and b* (yellow-blue axis) values of the sample, calculate the color difference ΔE: , calibrated with a standard white board; randomly select 5 test points on the surface of the sample, measure each point 3 times, calculate the ΔE value of each point from the reference point, and take the maximum value as the final result; (3)Coefficient of thermal expansion: Refer to GB / T16920-2015 for the coefficient of thermal expansion test, and the test temperature range is 20°C - 300°C; The test results are shown in Table 1.

[0052] Table 1 Performance test results of black quartz glass materials

[0053] As can be seen from Table 1, the black quartz glass materials involved in the embodiments of the present invention have better light absorption effect, better color uniformity, smaller color difference ΔE, and lower coefficient of thermal expansion than the products of the comparative examples; the combined use of strontium nitrate, niobium oxalate, tantalum chloride, soluble rare earth salts, sol-gel method and heat treatment process is beneficial to improving the above properties.

[0054] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A black fused quartz glass material, characterized in that, The invention is made of the following raw materials in percentage by weight: 0.8wt%-3.8wt% of trace element additives, 0.01wt%-0.05wt% of flux, and the balance is high-purity quartz sand; the trace element additives include the following components in percentage by weight: 0.03-0.05 parts of strontium nitrate, 1-3 parts of titanium nitrate, 1-2 parts of manganese nitrate, 2-3 parts of iron nitrate, 0.1-0.3 parts of soluble rare earth salt, 0.05-0.1 parts of nickel nitrate, 0.03-0.05 parts of chromium nitrate, 0.05-0.08 parts of niobium oxalate, and 0.03-0.05 parts of tantalum chloride.

2. The black quartz glass material according to claim 1, wherein The flux is a mixture of boron oxide and lanthanum oxide in a mass ratio of (1-3):

1.

3. The black quartz glass material according to claim 1, characterized in that, The soluble rare earth salt is prepared by mixing praseodymium nitrate, cerium nitrate, gadolinium nitrate and dysprosium nitrate in a mass ratio of 1:(0.8-1.2):(1-2):0.

6.

4. The black quartz glass material according to claim 1, characterized in that, The average particle size of the high-purity quartz sand is 30-100 meshes.

5. The black quartz glass material according to claim 1, characterized in that, The impurity content in the high-purity quartz sand is less than 10 ppm, and the silicon dioxide content is greater than 99.998 wt%.

6. A method for preparing the black quartz glass material according to any one of claims 1-5, characterized in that, The steps include: Step S1, mixing the components of the trace element additive uniformly by weight to obtain a metal salt mixture, dissolving it in deionized water to form a metal salt mixture solution, then adding 30-40% of citric acid based on the total mass of the metal salt mixture, stirring magnetically at 65-75° C. for 2-4 hours, adjusting the pH of the solution to 3.5-4.0 with aqueous ammonia to form a stable sol system; adding ethylene glycol as a crosslinking agent at 15% of the mass of the sol, continuing stirring for 0.8-1.2 hours, and then transferring to an oven, drying at 130° C. for 20-24 hours to form a wet gel; crushing the wet gel and adding it to a spray dryer for spray drying to obtain a spherical precursor powder with an average particle size of 10-20 μm; calcining and activating to obtain the trace element additive; Step S2: After the trace element additives, flux and high-purity quartz sand are fully mixed, they are dried and expanded by a sand baking machine, and then screened and magnetically separated to remove metal impurities, and then put into a continuous melting furnace for smelting, drawn into shape, and finally heat treated to obtain a black quartz glass material.

7. The preparation method of the black quartz glass material according to claim 6, characterized in that, The mass ratio of the total mass of the metal salt mixture to water in the metal salt mixture solution is (12-20):(80-88).

8. The method for preparing the black quartz glass material according to claim 6, characterized in that, The inlet temperature of the spray dryer is 210-230°C, and the outlet temperature is 90-110°C; the calcination activation is specifically: heating to 640-670°C at a heating rate of 5-8°C / min, and keeping the temperature for 3-5 hours.

9. The method for preparing the black quartz glass material according to claim 6, wherein, The temperature of the drying and puffing in step S2 is 1190-1240°C; the temperature of the smelting in step S2 is 1880-1980°C.

10. The method for preparing the black quartz glass material according to claim 6, wherein The heat treatment in step S2 is annealing treatment, the annealing temperature is 580-630° C., and the insulation time is 1-2 hours.

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