CN115231927A - High-strength light refractory material and preparation method thereof - Google Patents
High-strength light refractory material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of refractory materials, in particular to a high-strength light refractory material and a preparation method thereof, wherein the high-strength light refractory material comprises the following raw materials in parts by weight: 30-50 parts of silicon carbide, 20-24 parts of talcum powder, 25-29 parts of kyanite, 3-5 parts of quartz powder, 5-10 parts of boehmite sol, 30-50 parts of mullite sol, 5-10 parts of Suzhou soil, 5-10 parts of metal silicon powder, 1-3 parts of activating agent, 0.5-2 parts of sintering aid and 3-8 parts of adhesive, wherein the volume density of the prepared refractory material is 2.32-2.38 g/cm 3 The breaking strength and compressive strength at room temperature are respectively 60-68 MPa and 125-133 MPa, and the reduction range of the breaking strength and compressive strength of the refractory material at high temperature (800 ℃) is less than or equal to 40 percent, so that the refractory material has the characteristics of light weight, high strength and excellent thermal shock resistance.
Description
Technical Field
The invention relates to the field of refractory materials, in particular to a high-strength light refractory material and a preparation method thereof.
Background
The refractory material is widely applied to various fields of national economy such as steel, nonferrous metals, glass, cement, ceramics, petrifaction, machinery, boilers, light industry, electric power, military industry and the like, is an essential basic material for ensuring the production operation and the technical development of the industries, plays an irreplaceable important role in the production and development of high-temperature industries, statistically, the yield of the refractory material in China accounts for 65-75% of the whole world, and the output and sale quantity of the refractory material in China stably lives the first of the refractory materials in the world.
Silicon carbide is an important raw material for producing refractory materials, has high thermal conductivity coefficient which is about 10-14 times that of clay products, low expansion coefficient, good thermal stability, high-temperature pressure resistance, large breaking strength and stable chemical performance, but has the defects of insufficient toughness at room temperature, difficult sintering and the like.
Chinese patent CN108285350A discloses a ternary composite silicon carbide refractory material, which comprises a base material and a binder, wherein the base material comprises 30-40 wt% of silicon carbide aggregate, 10-55 wt% of silicate mineral, 5-35 wt% of industrial-grade aluminum raw material and 10-35 wt% of cordierite, and the binder accounts for 6-12 wt% of the base material. According to the invention, the high-strength and low-expansion mullite-cordierite matrix is introduced among the silicon carbide aggregate particles in an in-situ synthesis manner to serve as a binding phase, so that the problems that the artificially synthesized powder and the aggregate are not easy to mix uniformly and are difficult to bind in the prior art are effectively solved, the technical defects of low strength, poor thermal shock resistance and the like caused by the artificial synthesized powder and the aggregate are avoided, and the quality of the silicon carbide refractory material is obviously improved.
In the patent, the silicon carbide aggregate and the silicon carbide aggregate are directly mixed and pressed, so that the problem of poor bonding property of silicon carbide and cordierite cannot be solved, and the mechanical property and the thermal shock stability of the prepared refractory material are adversely affected to a certain extent.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the technical problems, the invention provides a high-strength light refractory material and a preparation method thereof.
The adopted technical scheme is as follows:
a high-strength light refractory material comprises the following raw materials in parts by weight:
30-50 parts of silicon carbide, 20-24 parts of talcum powder, 25-29 parts of kyanite, 3-5 parts of quartz powder, 5-10 parts of boehmite sol, 30-50 parts of mullite sol, 5-10 parts of Suzhou soil, 5-10 parts of metal silicon powder, 1-3 parts of activating agent, 0.5-2 parts of sintering aid and 3-8 parts of adhesive.
Further, the feed comprises the following raw materials in parts by weight:
45 parts of silicon carbide, 21 parts of talcum powder, 29 parts of kyanite, 3 parts of quartz powder, 8 parts of boehmite sol, 50 parts of mullite sol, 6 parts of Suzhou soil, 8 parts of metal silicon powder, 2.2 parts of activating agent, 1 part of sintering aid and 5 parts of adhesive.
Further, the particle diameter D50 of the silicon carbide is 30-60 mu m;
the particle size D50 of the talcum powder is 5-10 mu m;
the grain diameter D50 of the kyanite is 0.2-1 mu m;
the particle size D50 of the quartz powder is 5-10 mu m;
the particle size D50 of the Suzhou soil is 0.2-1 mu m;
the particle size D50 of the metal silicon powder is 0.2-1 μm.
Further, the preparation method of the boehmite sol is as follows:
adding aluminum isopropoxide into water, stirring uniformly, heating to reflux reaction for 1.5-2 h, cooling to 80-90 ℃, opening to fully volatilize the generated isopropanol, adding dilute hydrochloric acid solution, heating to reflux reaction for 1.5-2 h, cooling to 70-80 ℃, preserving heat, and standing for 3-5 h.
Further, the preparation method of the mullite sol comprises the following steps:
adding aluminum nitrate into ethanol, stirring for dissolving, heating to 50-70 ℃, adding tetraethoxysilane and dilute hydrochloric acid solution, stirring for 1-2 h, adjusting the pH of the system to 3-4 by using ammonia water, and keeping the temperature and standing for 2-4 h.
Further, the activating agent comprises yttrium oxide, lanthanum oxide and magnesium oxide, and the mass ratio of yttrium oxide to lanthanum oxide to magnesium oxide is 5-10: 1:5 to 10.
Furthermore, the sintering aid is Bi series low-melting-point glass powder.
Further, the Bi series low melting point glass powder is Bi 2 O 3 -ZnO-B 2 O 3 And (3) glass powder.
Further, the adhesive is a polyvinyl alcohol solution with the mass concentration of 5-10%.
The invention also provides a preparation method of the high-strength light refractory material, which comprises the following steps: mixing boehmite sol and mullite sol, adding silicon carbide and a bonding agent, stirring uniformly, adding Suzhou soil, metal silicon powder, an activating agent and a sintering aid, stirring again, ageing for 20-30 h, compression molding, presintering for 1-2 h at 500-600 ℃, and heating to 1350-1400 ℃ for sintering for 2-4 h.
The invention has the beneficial effects that:
the invention provides a high-strength light refractory material, which is characterized in that the bonding property of silicon carbide and cordierite is poor, the mechanical property and thermal shock stability are not ideal, the cordierite is synthesized in situ, the talc powder, kyanite and quartz powder are used as materials, the volume effect is minimum in the process of preparing cordierite, the formed cordierite and silicon carbide can be tightly bonded, the boehmite sol and the mullite sol can fully infiltrate the gap between the silicon carbide and the cordierite to enable the silicon carbide and the cordierite to be more tightly bonded, the high-activity mullite ultrafine particles and the active alumina generated in the sintering process can be distributed at the grain boundary to promote sintering, the strength of the refractory material is improved, the activating agent can effectively inhibit the generation of cristobalite and promote the low-temperature synthesis of cordierite phase, the breaking strength of the refractory material can be improved through a crack deflection mechanism, the sintering aid can improve the bonding density of the refractory material after sintering to a certain degree and improve the internal performance defects, and the volume density of the refractory material prepared by the invention is 2.32-2.38 g/cm 3 The breaking strength and the compressive strength of the refractory material at room temperature are respectively 60-68 MPa and 125-133 MPa, and the reduction range of the breaking strength and the compressive strength of the refractory material at high temperature (800 ℃) is less than or equal to 40 percent, so the refractory material has the characteristics of light weight, high strength and excellent thermal shock resistance.
Drawings
FIG. 1 is a microscopic structural view of a high-strength lightweight refractory prepared in example 1 of the present invention.
Detailed Description
The examples, in which specific conditions are not specified, were carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1:
a high-strength light refractory material comprises the following raw materials in parts by weight:
45 parts of silicon carbide, 21 parts of talcum powder, 29 parts of kyanite, 3 parts of quartz powder, 8 parts of boehmite sol, 50 parts of mullite sol, 6 parts of Suzhou soil, 8 parts of metal silicon powder, 1 part of yttrium oxide, 0.2 part of lanthanum oxide, 1 part of magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 1 part of glass powder and 5 parts of polyvinyl alcohol solution with the mass concentration of 5%.
Wherein the grain diameter D50 of the silicon carbide is 35 μm, and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of the talcum powder is 5.3 mu m, and the talcum powder is purchased from Fucai mineral products, inc. in the county of east China sea;
the particle size D50 of the kyanite is 0.8 mu m, and is purchased from Fucai mineral products, inc. in the county of east China sea;
the particle size D50 of the quartz powder is 6.5 mu m, and the quartz powder is purchased from Fucai mineral products, inc. in east China sea county;
suzhou clay has a particle size D50 of 0.7 μm and is purchased from Fucai mineral products, inc. in east China sea;
the particle size D50 of the metal silicon powder is 1 mu m and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of yttrium oxide is 40 μm, and is purchased from Shandong Xiang Showa New Material Co., ltd;
lanthanum oxide having a particle size D50 of 50 μm, available from Shandong Xiang Sho New materials Co., ltd;
the particle diameter D50 of the magnesium oxide is 48 μm, and is purchased from Shandong Xiang Showa novel materials Co., ltd;
Bi 2 O 3 -ZnO-B 2 O 3 the glass powder has a particle size D50 of 50 μm and is purchased from Fucai ore in Donghai countyA chemical product of Bi 2 O 3 77.81wt％，ZnO 11.63wt％，B 2 O 3 10.56wt％，；
The preparation method of the boehmite sol is as follows:
adding 100g of aluminum isopropoxide into 250mL of water, uniformly stirring, heating to reflux reaction for 2h, cooling to 85 ℃, opening to fully volatilize the generated isopropanol, adding 10mL of 1wt% diluted hydrochloric acid solution, heating to reflux reaction for 2h, cooling to 70 ℃, preserving heat, and standing for 5 h.
The preparation method of the mullite sol comprises the following steps:
adding 100g of aluminum nitrate into 250mL of ethanol, stirring for dissolving, heating to 60 ℃, adding 32.6g of ethyl orthosilicate and 25mL of 1wt% diluted hydrochloric acid solution, stirring for 2h, adjusting the pH of the system to 4 by using 25% ammonia water, and keeping the temperature and standing for 4 h.
The preparation method of the high-strength light refractory material comprises the following steps:
mixing boehmite sol and mullite sol, adding silicon carbide and polyvinyl alcohol solution, stirring uniformly, and adding Suzhou soil, metal silicon powder, yttrium oxide, lanthanum oxide, magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 And stirring the glass powder again, ageing the mixture for 24 hours, performing compression molding, presintering at 550 ℃ for 2 hours, and heating to 1400 ℃ again to sinter the mixture for 4 hours.
Example 2:
a high-strength light refractory material comprises the following raw materials in parts by weight:
50 parts of silicon carbide, 24 parts of talcum powder, 29 parts of kyanite, 5 parts of quartz powder, 10 parts of boehmite sol, 50 parts of mullite sol, 10 parts of Suzhou soil, 10 parts of metal silicon powder, 1 part of yttrium oxide, 0.2 part of lanthanum oxide, 1 part of magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 2 parts of glass powder and 8 parts of polyvinyl alcohol solution with the mass concentration of 10%.
Wherein the grain diameter D50 of the silicon carbide is 35 μm, and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of the talcum powder is 5.3 mu m, and the talcum powder is purchased from Fucai mineral products, inc. in the county of east China sea;
the particle size D50 of the kyanite is 0.8 mu m, and is purchased from Fucai mineral products, inc. in the county of east China sea;
the particle size D50 of the quartz powder is 6.5 mu m, and the quartz powder is purchased from Fucai mineral products, inc. in east China sea county;
suzhou clay has a particle size D50 of 0.7 μm and is purchased from Fucai mineral products, inc. in east China sea;
the particle size D50 of the metal silicon powder is 1 mu m and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of yttrium oxide is 40 μm, and is purchased from Shandong Xiang Sho New materials Co., ltd;
the particle size D50 of lanthanum oxide is 50 μm, and is purchased from Shandong Xiang Showa novel materials Co., ltd;
the particle size D50 of the magnesium oxide is 48 μm, and is purchased from Shandong Xiang Sho New Material Co., ltd;
Bi 2 O 3 -ZnO-B 2 O 3 the glass powder has a particle size D50 of 50 μm, is purchased from Fucai mineral products GmbH in Donghai county, and comprises Bi 2 O 3 77.81wt％，ZnO 11.63wt％，B 2 O 3 10.56wt％，；
The preparation method of the boehmite sol is as follows:
adding 100g of aluminum isopropoxide into 250mL of water, uniformly stirring, heating to reflux reaction for 2h, cooling to 90 ℃ to enable the generated isopropanol to be fully volatilized, adding 10mL of 1wt% diluted hydrochloric acid solution, heating to reflux reaction for 2h, cooling to 80 ℃, preserving heat, and standing for 5 h.
The preparation method of the mullite sol comprises the following steps:
adding 100g of aluminum nitrate into 250mL of ethanol, stirring for dissolving, heating to 70 ℃, adding 32.6g of ethyl orthosilicate and 25mL of 1wt% diluted hydrochloric acid solution, stirring for 2h, adjusting the pH of the system to 4 by using 25% ammonia water, and keeping the temperature and standing for 4 h.
The preparation method of the high-strength light refractory material comprises the following steps:
mixing boehmite sol and mullite sol, adding silicon carbide and polyvinyl alcohol solution, stirring uniformly, and adding Suzhou soil, metal silicon powder, yttrium oxide, lanthanum oxide, magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 And stirring the glass powder again, ageing the glass powder for 30 hours, performing compression molding, presintering the glass powder for 2 hours at the temperature of 600 ℃, and heating the glass powder to 1400 ℃ for sintering the glass powder for 4 hours.
Example 3:
a high-strength light refractory material comprises the following raw materials in parts by weight:
30 parts of silicon carbide, 20 parts of talcum powder, 25 parts of kyanite, 3 parts of quartz powder, 5 parts of boehmite sol, 30 parts of mullite sol, 5 parts of Suzhou soil, 5 parts of metal silicon powder, 1 part of yttrium oxide, 0.2 part of lanthanum oxide, 1 part of magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 0.5 part of glass powder and 3 parts of polyvinyl alcohol solution with the mass concentration of 5%.
Wherein the grain diameter D50 of the silicon carbide is 35 μm, and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of the talcum powder is 5.3 mu m, and the talcum powder is purchased from Fucai mineral products, inc. in east China sea county;
the kyanite has a particle size D50 of 0.8 μm and is purchased from Rich color mineral products, inc. in east China sea county;
the particle size D50 of the quartz powder is 6.5 mu m, and the quartz powder is purchased from Fucai mineral products, inc. in east China sea county;
suzhou clay has a particle size D50 of 0.7 μm and is purchased from Fucai mineral products, inc. in east China sea;
the particle size D50 of the metal silicon powder is 1 mu m, and is purchased from Shandongxin billion metal materials Co., ltd;
the particle size D50 of yttrium oxide is 40 μm, and is purchased from Shandong Xiang Showa New Material Co., ltd;
the particle size D50 of lanthanum oxide is 50 μm, and is purchased from Shandong Xiang Showa novel materials Co., ltd;
the particle diameter D50 of the magnesium oxide is 48 μm, and is purchased from Shandong Xiang Showa novel materials Co., ltd;
Bi 2 O 3 -ZnO-B 2 O 3 the glass powder has a particle size D50 of 50 μm, is purchased from Fucai mineral products GmbH in Donghai county, and comprises Bi 2 O 3 77.81wt％，ZnO 11.63wt％，B 2 O 3 10.56wt％，；
The preparation method of the boehmite sol is as follows:
adding 100g of aluminum isopropoxide into 250mL of water, uniformly stirring, heating to reflux reaction for 1.5h, cooling to 80 ℃ and opening to fully volatilize the generated isopropanol, adding 10mL of 1wt% diluted hydrochloric acid solution, heating to reflux reaction for 1.5h, cooling to 70 ℃, preserving heat, and standing for 3 h.
The preparation method of the mullite sol comprises the following steps:
adding 100g of aluminum nitrate into 250mL of ethanol, stirring for dissolving, heating to 50 ℃, adding 32.6g of tetraethoxysilane and 25mL of 1wt% diluted hydrochloric acid solution, stirring for 1h, adjusting the pH value of the system to 3 by using 25% ammonia water, and keeping the temperature and standing for 2 h.
The preparation method of the high-strength light refractory material comprises the following steps:
mixing boehmite sol and mullite sol, adding silicon carbide and polyvinyl alcohol solution, stirring uniformly, and adding Suzhou soil, metal silicon powder, yttrium oxide, lanthanum oxide, magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 And stirring the glass powder again, ageing for 20 hours, carrying out compression molding, presintering for 1 hour at 500 ℃, and then heating to 1350 ℃ for sintering for 2 hours.
Example 4:
a high-strength light refractory material comprises the following raw materials in parts by weight:
50 parts of silicon carbide, 20 parts of talcum powder, 29 parts of kyanite, 3 parts of quartz powder, 10 parts of boehmite sol, 30 parts of mullite sol, 10 parts of Suzhou soil, 5 parts of metal silicon powder, 1 part of yttrium oxide, 0.2 part of lanthanum oxide, 1 part of magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 2 parts of glass powder and 8 parts of polyvinyl alcohol solution with the mass concentration of 5%.
Wherein the grain diameter D50 of the silicon carbide is 35 μm, and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of the talcum powder is 5.3 mu m, and the talcum powder is purchased from Fucai mineral products, inc. in the county of east China sea;
the particle size D50 of the kyanite is 0.8 mu m, and is purchased from Fucai mineral products, inc. in the county of east China sea;
the particle size D50 of the quartz powder is 6.5 mu m, and the quartz powder is purchased from Fucai mineral products, inc. in the county of east China sea;
suzhou clay having a particle size D50 of 0.7 μm and available from Fucai mineral products, inc. in the county of east China;
the particle size D50 of the metal silicon powder is 1 mu m and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of yttrium oxide is 40 μm, and is purchased from Shandong Xiang Showa New Material Co., ltd;
lanthanum oxide having a particle size D50 of 50 μm, available from Shandong Xiang Sho New materials Co., ltd;
the particle diameter D50 of the magnesium oxide is 48 μm, and is purchased from Shandong Xiang Showa novel materials Co., ltd;
Bi 2 O 3 -ZnO-B 2 O 3 the glass powder has a particle size D50 of 50 μm, is purchased from Fucai mineral products GmbH in Donghai county, and comprises Bi 2 O 3 77.81wt％，ZnO 11.63wt％，B 2 O 3 10.56wt％，；
The preparation method of the boehmite sol is as follows:
adding 100g of aluminum isopropoxide into 250mL of water, uniformly stirring, heating to reflux reaction for 1.5h, cooling to 90 ℃ to enable the generated isopropanol to be fully volatilized, adding 10mL of 1wt% diluted hydrochloric acid solution, heating to reflux reaction for 1.5h, cooling to 80 ℃, preserving heat, and standing for 3 h.
The preparation method of the mullite sol comprises the following steps:
adding 100g of aluminum nitrate into 250mL of ethanol, stirring for dissolving, heating to 70 ℃, adding 32.6g of ethyl orthosilicate and 25mL of 1wt% diluted hydrochloric acid solution, stirring for 1h, adjusting the pH of the system to 4 by using 25% ammonia water, and keeping the temperature and standing for 2 h.
The preparation method of the high-strength light refractory material comprises the following steps:
mixing boehmite sol and mullite sol, adding silicon carbide and polyvinyl alcohol solution, stirring uniformly, and adding Suzhou soil, metal silicon powder, yttrium oxide, lanthanum oxide, magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 And stirring the glass powder again, ageing the glass powder for 30 hours, performing compression molding, presintering the glass powder for 2 hours at 500 ℃, and heating to 1350 ℃ for sintering for 4 hours.
Example 5:
a high-strength light refractory material comprises the following raw materials in parts by weight:
30 parts of silicon carbide, 24 parts of talcum powder, 25 parts of kyanite, 5 parts of quartz powder, 5 parts of boehmite sol, 50 parts of mullite sol, 5 parts of Suzhou soil, 10 parts of metal silicon powder, 1 part of yttrium oxide, 0.2 part of lanthanum oxide, 1 part of magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 0.5 part of glass powder and 3 parts of polyvinyl alcohol solution with the mass concentration of 10%.
Wherein the grain diameter D50 of the silicon carbide is 35 μm, and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of the talcum powder is 5.3 mu m, and the talcum powder is purchased from Fucai mineral products, inc. in the county of east China sea;
the kyanite has a particle size D50 of 0.8 μm and is purchased from Rich color mineral products, inc. in east China sea county;
the particle size D50 of the quartz powder is 6.5 mu m, and the quartz powder is purchased from Fucai mineral products, inc. in the county of east China sea;
suzhou clay having a particle size D50 of 0.7 μm and available from Fucai mineral products, inc. in the county of east China;
the particle size D50 of the metal silicon powder is 1 mu m and is purchased from Shandongxin billion metal materials GmbH;
the particle size D50 of yttrium oxide is 40 μm, and is purchased from Shandong Xiang Showa New Material Co., ltd;
the particle size D50 of lanthanum oxide is 50 μm, and is purchased from Shandong Xiang Showa novel materials Co., ltd;
the particle diameter D50 of the magnesium oxide is 48 μm, and is purchased from Shandong Xiang Showa novel materials Co., ltd;
Bi 2 O 3 -ZnO-B 2 O 3 the glass powder has a particle size D50 of 50 μm, is purchased from Fucai mineral products, inc. in east China sea county, and has a composition of Bi 2 O 3 77.81wt％，ZnO 11.63wt％，B 2 O 3 10.56wt％，；
The preparation method of the boehmite sol is as follows:
adding 100g of aluminum isopropoxide into 250mL of water, uniformly stirring, heating to reflux reaction for 2h, cooling to 80 ℃ to enable the generated isopropanol to be fully volatilized, adding 10mL of 1wt% diluted hydrochloric acid solution, heating to reflux reaction for 2h, cooling to 70 ℃, preserving heat, and standing for 5 h.
The preparation method of the mullite sol comprises the following steps:
adding 100g of aluminum nitrate into 250mL of ethanol, stirring for dissolving, heating to 50 ℃, adding 32.6g of ethyl orthosilicate and 25mL of 1wt% diluted hydrochloric acid solution, stirring for 2h, adjusting the pH value of the system to 3 by using 25% ammonia water, and keeping the temperature and standing for 4 h.
The preparation method of the high-strength light refractory material comprises the following steps:
mixing boehmite sol and mullite sol, adding silicon carbide and polyvinyl alcohol solution, stirring uniformly, and adding Suzhou soil, metal silicon powder, yttrium oxide, lanthanum oxide, magnesium oxide and Bi 2 O 3 -ZnO-B 2 O 3 And stirring the glass powder again, ageing for 20 hours, carrying out compression molding, presintering for 1 hour at 600 ℃, and then heating to 1400 ℃ for sintering for 2 hours.
Comparative example 1
Comparative example 1 is essentially the same as example 1 except that no boehmite sol was added.
Comparative example 2
Comparative example 2 is essentially the same as example 1 except that no mullite sol is added.
Comparative example 3
Comparative example 3 is essentially the same as example 1 except that no yttria was added.
Comparative example 4
Comparative example 4 is essentially the same as example 1 except that lanthanum oxide was not added.
Comparative example 5
Comparative example 5 is essentially the same as example 1 except that no magnesium oxide is added.
Comparative example 6
Comparative example 6 is substantially the same as example 1 except that no Bi is added 2 O 3 -ZnO-B 2 O 3 And (3) glass powder.
And (3) performance testing:
the refractory materials prepared in examples 1 to 5 and comparative examples 1 to 6 of the invention are used as samples, the volume density of the samples is detected according to GB/T2997-2000, the flexural strength and the compressive strength of the samples at room temperature and high temperature (800 ℃) are respectively tested according to GB/T3001-2017 and GB/T5072-2008 standards, the thermal conductivity of the samples at high temperature (800 ℃) is detected according to YB/T4130-2005 (flat plate method), and the test results are shown in the following table 1:
table 1:
as can be seen from Table 1 above, the refractory material prepared by the present invention has a bulk density of 2.32 to 2.38g/cm 3 The breaking strength and the compressive strength of the refractory material at room temperature are respectively 60-68 MPa and 125-133 MPa, and the reduction range of the breaking strength and the compressive strength of the refractory material at high temperature (800 ℃) is less than or equal to 40 percent, so the refractory material has the characteristics of light weight, high strength and excellent thermal shock resistance.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A high-strength light refractory material is characterized by comprising the following raw materials in parts by weight:
30-50 parts of silicon carbide, 20-24 parts of talcum powder, 25-29 parts of kyanite, 3-5 parts of quartz powder, 5-10 parts of boehmite sol, 30-50 parts of mullite sol, 5-10 parts of Suzhou soil, 5-10 parts of metal silicon powder, 1-3 parts of activating agent, 0.5-2 parts of sintering aid and 3-8 parts of adhesive.
2. The high-strength light-weight refractory material according to claim 1, comprising the following raw materials in parts by weight:
45 parts of silicon carbide, 21 parts of talcum powder, 29 parts of kyanite, 3 parts of quartz powder, 8 parts of boehmite sol, 50 parts of mullite sol, 6 parts of Suzhou soil, 8 parts of metal silicon powder, 2.2 parts of an activating agent, 1 part of a sintering aid and 5 parts of a bonding agent.
3. The high-strength light-weight refractory according to claim 1, wherein the silicon carbide has a particle size D50 of 30 to 60 μm;
the particle size D50 of the talcum powder is 5-10 mu m;
the grain diameter D50 of the kyanite is 0.2-1 mu m;
the particle size D50 of the quartz powder is 5-10 mu m;
the particle size D50 of the Suzhou soil is 0.2-1 mu m;
the particle size D50 of the metal silicon powder is 0.2-1 μm.
4. The high strength, light weight refractory of claim 1 wherein the boehmite sol is prepared by the following method:
adding aluminum isopropoxide into water, stirring uniformly, heating to reflux reaction for 1.5-2 h, cooling to 80-90 ℃, opening to fully volatilize the generated isopropanol, adding dilute hydrochloric acid solution, heating to reflux reaction for 1.5-2 h, cooling to 70-80 ℃, preserving heat, and standing for 3-5 h.
5. The high strength, light weight refractory of claim 1 wherein the mullite sol is prepared by the following process:
adding aluminum nitrate into ethanol, stirring for dissolving, heating to 50-70 ℃, adding ethyl orthosilicate and dilute hydrochloric acid solution, stirring for 1-2 h, adjusting the pH of the system to 3-4 with ammonia water, and standing for 2-4 h.
6. The high strength, light weight refractory of claim 1 wherein the activator comprises yttria, lanthana, and magnesia, wherein the mass ratio of yttria, lanthana, and magnesia is from 5 to 10:1:5 to 10.
7. The high-strength light-weight refractory according to claim 1, wherein the sintering aid is a Bi-based low-melting glass frit.
8. A high-strength light-weight refractory according to claim 7, wherein the Bi-based low-melting glass frit is Bi 2 O 3 -ZnO-B 2 O 3 And (3) glass powder.
9. A high-strength light-weight refractory according to claim 1, wherein the binder is a polyvinyl alcohol solution having a mass concentration of 5 to 10%.
10. A preparation method of a high-strength light refractory according to any one of claims 1 to 9, characterized in that boehmite sol and mullite sol are mixed, then silicon carbide and a binder are added, after uniform stirring, suzhou soil, metal silicon powder, an activator and a sintering aid are added, after stirring again, ageing is carried out for 20-30 h, after compression molding, presintering is carried out for 1-2 h at 500-600 ℃, and then heating is carried out to 1350-1400 ℃ for sintering for 2-4 h.
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