KR20160139144A - Heat shielding material with excellent high-temperature strength and light-weight and manufacturing method of the same - Google Patents
Heat shielding material with excellent high-temperature strength and light-weight and manufacturing method of the same Download PDFInfo
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- KR20160139144A KR20160139144A KR1020150073499A KR20150073499A KR20160139144A KR 20160139144 A KR20160139144 A KR 20160139144A KR 1020150073499 A KR1020150073499 A KR 1020150073499A KR 20150073499 A KR20150073499 A KR 20150073499A KR 20160139144 A KR20160139144 A KR 20160139144A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/14—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silica
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
- C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
- C04B2237/04—Ceramic interlayers
- C04B2237/06—Oxidic interlayers
- C04B2237/068—Oxidic interlayers based on refractory oxides, e.g. zirconia
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Abstract
Description
The present invention relates to a composite heat shield made of zirconia powder and silicon oxide. More particularly, the present invention relates to a composite heat shield made of zirconia powder and silicon oxide, which is structurally low in thermal deformation and light in weight, And a method of manufacturing the same.
Heat shielding materials are widely used in various industrial fields requiring heat-resistant and refractory materials. These heat shields are used at high temperature (over 1000 ℃) and mainly have ceramic materials. Materials used as heat shields should have high phase stability at high temperatures, low thermal conductivity and high chemical stability.
Mullite has excellent thermal mechanical properties such as low thermal expansion coefficient, high creep resistance, high melting point, high high temperature strength and chemical stability, and is a heat insulating material widely used as a high temperature structural material or functional ceramics added to a ceramic heat insulating material.
However, such a mullite has a disadvantage of low thermal shock resistance. In the case of a conventional ceramic heat shield, the porosity is made to be less than 10% through the molding process, and the shrinkage in the high temperature is deformed have.
On the other hand, there is a problem in that the manufacturing method of the porous ceramic heat-shroud member known so far has to go through a complicated process and is not easy in production cost and mass productivity.
Accordingly, an object of the present invention is to provide a heat shield comprising zirconia and silicon oxide as effective components, which can effectively block heat while having low thermal conductivity, heat resistance, fire resistance and light weight at 1000 ° C or higher.
Another object of the present invention is to provide a method of manufacturing a porous heat shielding material containing zirconia and silicon oxide as effective components, which can effectively block heat while having thermal conductivity and heat resistance, fire resistance and light weight at 1000 ° C or higher.
In order to achieve the above object, the present invention provides a heat shield comprising zirconia and silicon oxide.
In one embodiment of the present invention, the silicon oxide may contain 4 to 20 parts by weight based on 100 parts by weight of the zirconia.
In an embodiment of the present invention, the heat shield may have a density of 3 to 4 g / cm < 2 >.
In an embodiment of the present invention, the heat shield may have uniform pores.
The present invention also relates to a method of preparing a composition comprising: (a) preparing a first composition in the form of a stabilized aqueous colloidal solution of silicon oxide and zirconia; (b) preparing a second composition in the form of a stabilized suspension wherein the organic particles and / or inorganic particles are mixed in an organic solution; (c) preparing a composition comprising a compound that destabilizes the first composition when mixing the first composition and the second composition to form a gel-forming and organic polymer net and acts as a foaming agent; (d) mixing the first composition and the second composition to form a mixture; (e) forming a gel-like porous structure from the mixture, wherein the organic structure supports an inorganic structure; (f) coagulating the gel-like porous structure and obtaining a porous structure surrounding the inorganic member of the net of organic polymer, wherein the silicon oxide in the first composition comprises 4 To 20 parts by weight based on the total weight of the porous heat shielding material.
According to the present invention, since the porous heat shielding material can be manufactured with a density of 3.2 g / cm 2 or less, it is lightweight and easy to handle, and a plurality of pores are uniformly distributed in the porous heat shielding material to exhibit porosity, It exhibits a low thermal conductivity and is excellent in heat resistance and fire resistance so that it can effectively utilize it as a thermal barrier material at high temperature because it has excellent mechanical properties, durability, chemical stability and strength as well as high heat.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a cross-section of a porous heat shield according to the invention.
2 is a cross-sectional view illustrating a porous heat shield according to a preferred embodiment of the present invention.
FIG. 3 is a graph showing a change in shrinkage ratio according to a change in weight of silicon oxide included in a porous heat block manufactured according to an embodiment of the present invention. FIG.
4 is a graph showing the thermal conductivity according to the weight change of silicon oxide included in the porous heat shield manufactured according to the embodiment of the present invention.
Hereinafter, the present invention will be described in detail.
The present invention provides a traction sheave of excellent strength and light weight.
The heat shield according to a preferred embodiment of the present invention includes zirconia (ZrO2) and silicon oxide, and the silicon oxide contains 4 to 20 parts by weight based on 100 parts by weight of the zirconia. A plurality of pores are uniformly distributed in the heat shield so that the heat shield exhibits porosity. The pores serve to lower the thermal conductivity and increase the thermal strain compliance. The silicon oxide acts as a binder for binding zirconia (ZrO 2 ) as a cement material.
The heat shield according to a preferred embodiment of the present invention exhibits low thermal conductivity at an ultra-high temperature region of 1000 ° C or more and is excellent in heat resistance and fire resistance, effectively shielding heat transfer, and has excellent mechanical properties, durability, chemical stability, It can be utilized as a material for a train in a high temperature environment.
The heat shield according to the preferred embodiment of the present invention can withstand a high temperature of 1000 ° C or higher, which is an ultra-high temperature environment, and can be used as a heat shield for sapphire single crystal growth.
The heat shield according to the preferred embodiment of the present invention may have a density of 3 to 4 g / cm < 2 >, preferably 3.2 g / cm < 2 >. The heat shield of the present invention has advantages of being easy to handle due to the lightweight characteristics as described above.
The heat shield according to the preferred embodiment of the present invention can have uniform pores and exhibits a porous structure by uniformly distributing a plurality of pores in the heat shield to exhibit low thermal conductivity at a high temperature region of 1000 ° C or more and excellent heat resistance and fire resistance The heat transfer can be effectively blocked.
Hereinafter, a method of manufacturing a heat shield according to a preferred embodiment of the present invention will be described.
To prepare the heat shield of the present invention, first a first composition in the form of a stabilized aqueous colloidal solution of silicon oxide and zirconia is prepared. The first composition may be substituted with at least one material selected from the group consisting of titanium oxide zirconium oxide, silicon carbide, titanium carbide, silicon nitride, iron oxide, and magnesium hydroxide instead of silicon oxide, and may further include a catalyst. The silicon oxide preferably contains 4 to 20 parts by weight based on 100 parts by weight of the zirconia.
A second composition is then prepared in the form of a stabilized suspension wherein the organic particles and / or inorganic particles are mixed in an organic solution. The second composition is preferably prepared in the form of a stabilized suspension in which calcium carbonate and anhydrous acetic acid are mixed.
Next, at least one substance selected from the group consisting of borate, carbonate, nitride, peroxide, silicate, phosphate, and sulfate is added to destabilize the first composition. Which destabilizes the first composition when mixing the first and second compositions to form a gel and an organic polymer net, and acts as a blowing agent.
Next, the first composition and the second composition are mixed. The mixing ratio of the first composition and the second composition is preferably 1: 0.5 to 1: 2.
By this mixing step, a gel-type porous structure is formed in which the organic structure supports the inorganic structure. Then, the gel-type porous structure is solidified, and a net structure of the organic polymer surrounds the inorganic member. have.
For a more precise manufacturing process, it is preferable to add a step of heat-treating and pulverizing the second composition. The heat treatment is preferably performed by accurately mixing the mixture of the particles and dissolving in a temperature range of 500 ° C to 1500 ° C, for example, using calcium carbonate contained in the second composition. Through this, the final heat insulating material It is possible to give a change to the main characteristics of the device. The heat-treated material may have a desired particle size through a pulverizing and screening process. The particle size is preferably 100 m or less, and more preferably, the particle size of zirconia is 0.1 to 30 m. In addition, it is possible to carry out the above-mentioned heat treatment process at a proper melting temperature together with the calcium oxide, silicon oxide, organic acid salt, organic or inorganic substance powder, and it is not necessary to dissolve all the powder in the above process, To form a complex composed of the material.
Hereinafter, the production method of the present invention will be described in more detail with reference to the following examples. It should be understood, however, that there is no intention to limit the technical scope of the components of the present invention to those illustrated in the embodiments. Furthermore, those skilled in the art will readily be able to modify or alter the principles of the invention and its practice.
< Example >
Step 1: Preparation of the first composition
The first composition was prepared by mixing silicon oxide and zirconia. At this time, the silicon oxide was added in an amount of 10 parts by weight based on 100 parts by weight of the zirconia, and the used zirconia particle size was 0.1 to 30 μm.
Step 2: Preparation of the second composition
In the form of a stabilized suspension of a mixture of calcium carbonate and anhydrous acetic acid. In this case, the above-mentioned calcium carbonate was added in an amount of 4 parts by weight based on 100 parts by weight of the acetic anhydride and dissolved at a temperature of 500 ° C to 1500 ° C.
Step 3: destabilization of the first composition
To destabilize the first composition, a carbonate was added in an amount of 0.1 part by weight based on 100 parts by weight of the zirconia.
Step 4: Mixing the first and second compositions
The first and second compositions were mixed at a 1: 1 weight ratio at room temperature and atmospheric pressure.
According to an embodiment of the present invention, a porous heat shield comprising zirconia and silicon oxide supporting an inorganic structure can be obtained by bonding an organic structure with inorganic particles or surrounding inorganic particles.
The physical properties of the porous heat shielding material prepared according to the embodiment of the present invention were measured by the respective methods shown in the following experimental examples.
<Experimental Example 1>
Density measurement of porous trains
Was measured according to KS M 3808 In order to measure the density of the porous train end material produced according to the above embodiment, as a result, a silicon oxide, such as 3.2 g / cm 2 when the zirconia was added
< Experimental Example 2>
Porous Train-stop Silicon oxide Measure shrinkage change according to weight change
In order to measure a change in the shrinkage ratio according to the weight of the silicon oxide included in the porous heat shielding member manufactured according to the embodiment of the present invention, the shrinkage rate was measured after heating at 1000 ° C for 24 hours, Respectively. In general, if the shrinkage ratio exceeds 2.00, there is a high possibility that the property as a fire-resistant insulating material is lost.
< Experimental Example 3>
Porous Train-stop Silicon oxide Measurement of thermal conductivity according to weight change
In order to measure the thermal conductivity according to the weight of the silicon oxide included in the porous heat block manufactured according to the embodiment of the present invention, the thermal conductivity at 1000 ° C was measured and confirmed as shown in FIG.
The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that the present invention may be embodied in various other forms without departing from the spirit or essential characteristics thereof. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.
Claims (5)
Wherein the silicon oxide contains 4 to 20 parts by weight per 100 parts by weight of the zirconia.
Wherein the heat shield has a density of 3 to 4 g / cm < 2 >.
Wherein the heat shield has uniform pores.
(b) preparing a second composition in the form of a stabilized suspension wherein the organic particles and / or inorganic particles are mixed in an organic solution;
(c) preparing a composition comprising a compound that destabilizes the first composition when mixing the first composition and the second composition to form a gel-forming and organic polymer net and acts as a foaming agent;
(d) mixing the first composition and the second composition to form a mixture;
(e) forming a gel-like porous structure from the mixture, wherein the organic structure supports an inorganic structure;
(f) solidifying the gel-like porous structure and obtaining a porous structure surrounding the inorganic member with a net of organic polymer,
Wherein the silicon oxide in the first composition contains 4 to 20 parts by weight based on 100 parts by weight of the zirconia.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150073499A KR20160139144A (en) | 2015-05-27 | 2015-05-27 | Heat shielding material with excellent high-temperature strength and light-weight and manufacturing method of the same |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020150073499A KR20160139144A (en) | 2015-05-27 | 2015-05-27 | Heat shielding material with excellent high-temperature strength and light-weight and manufacturing method of the same |
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| KR20160139144A true KR20160139144A (en) | 2016-12-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082646A (en) * | 2017-05-26 | 2017-08-22 | 中国科学院过程工程研究所 | A kind of porous material and its low energy consumption preparation method and application |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101143312B1 (en) | 2011-11-02 | 2012-05-09 | 정덕수 | Heat shielding materials with excellent heat resistance and manufacturing method of the same |
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- 2015-05-27 KR KR1020150073499A patent/KR20160139144A/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101143312B1 (en) | 2011-11-02 | 2012-05-09 | 정덕수 | Heat shielding materials with excellent heat resistance and manufacturing method of the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107082646A (en) * | 2017-05-26 | 2017-08-22 | 中国科学院过程工程研究所 | A kind of porous material and its low energy consumption preparation method and application |
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