CN108285350A - A kind of tri compound SiC based refractories and preparation method thereof - Google Patents
A kind of tri compound SiC based refractories and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of tri compound SiC based refractories, including base-material and bonding agent, the group of the base-material becomes 30~40wt% of carborundum aggregate, 10~55wt% of silicate mineral, 5~35wt% of technical grade aluminum raw material, 10~35wt% of cordierite, and the dosage of the bonding agent is 6~12wt% of base-material.In addition the preparation method of above-mentioned tri compound SiC based refractories is also disclosed.The present invention introduces high-strength, low bulk mullite cordierite matrix as in conjunction with phase in a manner of fabricated in situ between carborundum aggregate particle, solve the problems, such as that the artificial synthesized powder of the prior art and aggregate are not easy to be uniformly mixed, are difficult to combine, the technological deficiencies such as low-intensity caused by this, thermal shock resistance difference are avoided, the quality of Tercod is significantly improved.Present invention process is simple, not only reduces firing temperature, and significantly reduce manufacturing cost, has a vast market foreground, may advantageously facilitate progress and the application development of industry technology.
Description
Technical field
The present invention relates to technical field of refractory materials more particularly to a kind of tri compound SiC based refractories and its systems
Preparation Method.
Background technology
Refractory material is very extensive in sector applications such as metallurgy, cement, glass, ceramics, quality and the matter for holding burned product
Amount and production cost have direct association.Due to being used in high temperature for a long time, refractory material needs to have that high-strength, low-heat is swollen
The performances such as swollen, high fire resistance, high creep resistance and good thermal stability and chemical stability.Since carbofrax material has
Have the advantages that elevated temperature strength is big, refractoriness under load is high, thermal stability and thermal conductivity are good, therefore is widely used as refractory material.
The material system of existing Tercod is based on clay-silicon carbide, mullite silicon carbide etc., i.e., with carbon
SiClx is aggregate, with oxide materials such as clay, mullite fine powder, aluminium oxide (or aluminium hydroxide) fine powder, fine silicas
For matrix.However, (flexural strength is usual for the shortcomings of material system of the prior art is high in the prevalence of low strong and coefficient of thermal expansion
Less than 60MPa, coefficient of thermal expansion is usually above 4.7 × 10-6·℃-1), reason essentially consists in：
(1) the most of raw material (such as mullite, corundum) used in the prior art is mainly artificial synthesized, with carbonization
Silicon aggregate is the mixing between two kinds of solid phases, is difficult not only to be uniformly mixed, but also the combination of the two belongs to physical contact, it is difficult to
Chemical bonding is generated, thus be easy to cause the disadvantages such as unstable product quality, intensity is low so that the quality of Tercod
It is difficult to be promoted.
(2) (the former coefficient of thermal expansion is 5.3 × 10 to the coefficient of thermal expansion height of the combination such as mullite and corundum phase-6·
℃-1, the latter is then 8.8 × 10-6·℃-1), thermal shock resistance usually higher so as to cause the coefficient of thermal expansion of this Related product
It is poor.
Since intensity and coefficient of thermal expansion are the key factors for directly affecting material thermal shock resistance, there is an urgent need for research and development
A kind of high-strength, low bulk SiC based refractories, the needs of to meet industry technology and application development.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of tri compound SiC based refractories,
To effectively improve intensity, the thermal shock resistance of material, thus greatly Improving The Quality of Products, and production cost is reduced, preferably
Meets the needs of industry technology and application development.Another object of the present invention is to provide above-mentioned tri compound silicon carbide refractories
The preparation method of material.
The purpose of the present invention is achieved by the following technical programs：
A kind of tri compound SiC based refractories provided by the invention, including base-material and bonding agent, the base-material
Group is green as 30~40wt% of carborundum aggregate, 10~55wt% of silicate mineral, 5~35wt% of technical grade aluminum raw material, violet
10~35wt% of stone.
Further, silicate mineral of the present invention is andalusite, sillimanite, kyanite or bauxite；The industry
Grade aluminum raw material is α-Al2O3、γ-Al2O3Or Al (OH)3。
In said program, the granularity of carborundum aggregate of the present invention is 60~325 mesh, and the granularity of silicate mineral is
The granularity of 180~250 mesh, technical grade aluminum raw material is 180~250 mesh, and the granularity of cordierite is 250~325 mesh.The combination
Agent is the PVA solution of concentration 5wt%.
Another object of the present invention is achieved by the following technical programs：
The preparation method of above-mentioned tri compound SiC based refractories provided by the invention is as follows：The base-material is mixed
Afterwards, bonding agent is added to be uniformly mixed；The green compact obtained after compression moulding, drying, are sintered, and violet blueness is obtained after firing
Stone-mullite silicon carbide fire resistant materials.
The present invention introduces high-strength mullite in carborundum aggregate by formula system by way of fabricated in situ
(mullite bonded mutually is synthesized to obtain by the blend high-temp in-situ of silicate mineral and technical grade aluminum raw material), and add low swollen
Swollen cordierite, which is used as, combines phase.In conjunction with mode be the liquid phase generated in sintering process using feedstock blend, the liquid phase
It is good with the carborundum aggregate wetability of slight oxidation, so as to be uniformly adhered to carborundum aggregate particle surface.Liquid phase
It is therefrom in situ that mullite is precipitated while carborundum aggregate particle is bonded together, between carborundum aggregate particle
It introduces high-strength, low bulk silicate phase to be used as in conjunction with phase, the dichroite-mullite-silicon carbide for obtaining tri compound is resistance to
Fiery material.
Further, its moisture of green compact ＜ 0.5% after drying described in preparation method of the present invention.
In said program, sintering temperature described in preparation method of the present invention is 1300~1400 DEG C, and firing time is 1~2h.
The invention has the advantages that：
(1) present invention introduces mullite in a manner of fabricated in situ, and silicon carbide can be evenly distributed in together with cordierite
The particle surface of aggregate, and chemical bonding is generated, high-strength, low bulk silicon is introduced between carborundum aggregate particle to realize
Hydrochlorate efficiently solves the artificial synthesized powder of the prior art and aggregate is not easy to be uniformly mixed, is difficult to combine mutually as phase is combined
Problem avoids the technological deficiencies such as low-intensity caused by this, significantly improves the quality of Tercod.Meanwhile
By introducing the cordierite of low thermal expansion, the coefficient of thermal expansion of refractory material can be greatly lowered, be conducive to weaken rapid heat cycle
Thermal stress caused by inside process in which materials, to help to improve the thermal shock resistance of product.Tri compound carbonization of the present invention
The main performance index of silica refractory is：80~100MPa of flexural strength, coefficient of thermal expansion 3.8~4.0 × 10-6·
℃-1。
(2) present invention process is simple, not only reduces firing temperature, and significantly reduce manufacturing cost, has wide
Market prospects, may advantageously facilitate progress and the application development of industry technology.
Description of the drawings
Below in conjunction with embodiment and attached drawing, the present invention is described in further detail：
Fig. 1 is that the microstructure of dichroite-mullite-SiC based refractories obtained by the embodiment of the present invention (is swept
Retouch Electronic Speculum secondary electron image).
Specific implementation mode
Embodiment one：
1, a kind of tri compound SiC based refractories of the present embodiment, including base-material and bonding agent, the group of base-material become
Carborundum aggregate (80~325 mesh) 30wt%, andalusite (180 mesh) 30wt%, α-Al2O3(325 mesh) 20wt%, cordierite
(325 mesh) 20wt%, bonding agent are the PVA solution of concentration 5wt%, and dosage is the 8wt% of base-material.
2, the present embodiment is a kind of as follows using corundum-silicon carbide composite ceramic materials that natural minerals are raw material：
After above-mentioned base-material is mixed, bonding agent is added and is uniformly mixed；After agitated, ageing mixture, selected according to product size suitable
When pressure compression moulding, dried at a temperature of 110 DEG C and obtain green compact (entering kiln moisture ＜ 0.5%)；Then in 1300 DEG C of temperature
Degree is lower to be burnt into 1h, obtains dichroite-mullite-SiC based refractories.
Embodiment two：
1, a kind of tri compound SiC based refractories of the present embodiment, including base-material and bonding agent, the group of base-material become
Carborundum aggregate (60~325 mesh) 35wt%, sillimanite (180 mesh) 40wt%, γ-Al2O3(325 mesh) 15wt%, cordierite
(325 mesh) 10wt%, bonding agent are the PVA solution of concentration 5wt%, and dosage is the 10wt% of base-material.
2, the present embodiment is a kind of as follows using corundum-silicon carbide composite ceramic materials that natural minerals are raw material：
After above-mentioned base-material is mixed, bonding agent is added and is uniformly mixed；After agitated, ageing mixture, selected according to product size suitable
When pressure compression moulding, dried at a temperature of 110 DEG C and obtain green compact (entering kiln moisture ＜ 0.5%)；Then in 1400 DEG C of temperature
Degree is lower to be burnt into 1h, obtains dichroite-mullite-SiC based refractories.
Embodiment three：
1, a kind of tri compound SiC based refractories of the present embodiment, including base-material and bonding agent, the group of base-material become
Carborundum aggregate (60~325 mesh) 30wt%, kyanite (180 mesh) 25wt%, Al (OH)3(325 mesh) 30wt%, cordierite
(325 mesh) 15wt%, bonding agent are the PVA solution of concentration 5wt%, and dosage is the 6wt% of base-material.
2, the present embodiment is a kind of as follows using corundum-silicon carbide composite ceramic materials that natural minerals are raw material：
After above-mentioned base-material is mixed, bonding agent is added and is uniformly mixed；After agitated, ageing mixture, selected according to product size suitable
When pressure compression moulding, dried at a temperature of 110 DEG C and obtain green compact (entering kiln moisture ＜ 0.5%)；Then in 1340 DEG C of temperature
Degree is lower to be burnt into 2h, obtains dichroite-mullite-SiC based refractories.
Example IV：
1, a kind of tri compound SiC based refractories of the present embodiment, including base-material and bonding agent, the group of base-material become
Carborundum aggregate (60~325 mesh) 40wt%, andalusite (180 mesh) 25wt%, α-Al2O3(325 mesh) 15wt%, cordierite
(325 mesh) 20wt%, bonding agent are the PVA solution of concentration 5wt%, and dosage is the 6wt% of base-material.
2, the present embodiment is a kind of as follows using corundum-silicon carbide composite ceramic materials that natural minerals are raw material：
After above-mentioned base-material is mixed, bonding agent is added and is uniformly mixed；After agitated, ageing mixture, selected according to product size suitable
When pressure compression moulding, dried at a temperature of 110 DEG C and obtain green compact (entering kiln moisture ＜ 0.5%)；Then in 1380 DEG C of temperature
Degree is lower to be burnt into 2h, obtains dichroite-mullite-SiC based refractories.
Embodiment five：
1, a kind of tri compound SiC based refractories of the present embodiment, including base-material and bonding agent, the group of base-material become
Carborundum aggregate (60~325 mesh) 40wt%, kyanite (180 mesh) 20wt%, γ-Al2O3(325 mesh) 28wt%, cordierite
(325 mesh) 12wt%, bonding agent are the PVA solution of concentration 5wt%, and dosage is the 8wt% of base-material.
2, the present embodiment is a kind of as follows using corundum-silicon carbide composite ceramic materials that natural minerals are raw material：
After above-mentioned base-material is mixed, bonding agent is added and is uniformly mixed；After agitated, ageing mixture, selected according to product size suitable
When pressure compression moulding, dried at a temperature of 110 DEG C and obtain green compact (entering kiln moisture ＜ 0.5%)；Then in 1360 DEG C of temperature
Degree is lower to be burnt into 1h, obtains dichroite-mullite-SiC based refractories.
Embodiment six：
1, a kind of tri compound SiC based refractories of the present embodiment, including base-material and bonding agent, the group of base-material become
Carborundum aggregate (60~325 mesh) 35wt%, bauxite (180 mesh) 50wt%, γ-Al2O3(250 mesh) 5wt%, cordierite
(325 mesh) 10wt%, bonding agent are the PVA solution of concentration 5wt%, and dosage is the 7wt% of base-material.
2, the present embodiment is a kind of as follows using corundum-silicon carbide composite ceramic materials that natural minerals are raw material：
After above-mentioned base-material is mixed, bonding agent is added and is uniformly mixed；After agitated, ageing mixture, selected according to product size suitable
When pressure compression moulding, dried at a temperature of 110 DEG C and obtain green compact (entering kiln moisture ＜ 0.5%)；Then in 1340 DEG C of temperature
Degree is lower to be burnt into 2h, obtains dichroite-mullite-SiC based refractories.
Embodiment seven：
1, a kind of tri compound SiC based refractories of the present embodiment, including base-material and bonding agent, the group of base-material become
Carborundum aggregate (60~325 mesh) 40wt%, sillimanite (180 mesh) 10wt%, α-Al2O3(325 mesh) 15wt%, cordierite
(325 mesh) 35wt%, bonding agent are the PVA solution of concentration 5wt%, and dosage is the 6wt% of base-material.
2, the present embodiment is a kind of as follows using corundum-silicon carbide composite ceramic materials that natural minerals are raw material：
After above-mentioned base-material is mixed, bonding agent is added and is uniformly mixed；After agitated, ageing mixture, selected according to product size suitable
When pressure compression moulding, dried at a temperature of 110 DEG C and obtain green compact (entering kiln moisture ＜ 0.5%)；Then in 1350 DEG C of temperature
Degree is lower to be burnt into 2h, obtains dichroite-mullite-SiC based refractories.
As shown in Figure 1, dichroite-mullite-SiC based refractories made from the embodiment of the present invention, in silicon carbide bone
The dichroite-mullite matrix introduced between material particle, is not only wrapped in the surface of carborundum aggregate particle, and with chemical bond
The mode of conjunction combines, and is uniformly mixed, in conjunction with stable and firm, is conducive to the quality for improving Tercod.
Claims (7)
1. a kind of tri compound SiC based refractories, it is characterised in that：Including base-material and bonding agent, the composition of the base-material
For 30~40wt% of carborundum aggregate, 10~55wt% of silicate mineral, 5~35wt% of technical grade aluminum raw material, cordierite 10
~35wt%, the dosage of the bonding agent are 6~12wt% of base-material.
2. tri compound SiC based refractories according to claim 1, it is characterised in that：The silicate mineral is
Andalusite, sillimanite, kyanite or bauxite；The technical grade aluminum raw material is α-Al2O3、γ-Al2O3Or Al (OH)3。
3. tri compound SiC based refractories according to claim 1, it is characterised in that：The carborundum aggregate
Granularity is 60~325 mesh, and the granularity of silicate mineral is 180~250 mesh, and the granularity of technical grade aluminum raw material is 180~250
The granularity of mesh, cordierite is 250~325 mesh.
4. tri compound SiC based refractories according to claim 1, it is characterised in that：The bonding agent is concentration
The PVA solution of 5wt%.
5. the preparation method of one of the claim 1-4 tri compound SiC based refractories, it is characterised in that：It will be described
After base-material mixing, bonding agent is added and is uniformly mixed；The green compact obtained after compression moulding, drying, are sintered, after firing i.e.
Dichroite-mullite-SiC based refractories are made.
6. the preparation method of tri compound SiC based refractories according to claim 5, it is characterised in that：It is described dry
Its moisture of green compact ＜ 0.5% after dry.
7. the preparation method of tri compound SiC based refractories according to claim 5, it is characterised in that：The burning
Junction temperature is 1300~1400 DEG C, and firing time is 1~2h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277852A (en) * | 2021-05-21 | 2021-08-20 | 景德镇陶瓷大学 | Cordierite-based microcrystalline glass combined silicon carbide ceramic material and preparation method thereof |
| CN115231927A (en) * | 2022-07-29 | 2022-10-25 | 湖南荣晟昌新材料科技有限公司 | High-strength light refractory material and preparation method thereof |
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| CN1800087A (en) * | 2006-01-16 | 2006-07-12 | 宜兴市宝欣耐火材料有限公司 | Highly heatproof and shockproof mullite-cordierite refractory composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113277852A (en) * | 2021-05-21 | 2021-08-20 | 景德镇陶瓷大学 | Cordierite-based microcrystalline glass combined silicon carbide ceramic material and preparation method thereof |
| CN113277852B (en) * | 2021-05-21 | 2022-08-02 | 景德镇陶瓷大学 | Cordierite-based microcrystalline glass combined silicon carbide ceramic material and preparation method thereof |
| CN115231927A (en) * | 2022-07-29 | 2022-10-25 | 湖南荣晟昌新材料科技有限公司 | High-strength light refractory material and preparation method thereof |
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Application publication date: 20180717 Assignee: Guangxi Sanhuan Enterprise Group Holding Co.,Ltd. Assignor: JINGDEZHEN CERAMIC INSTITUTE Contract record no.: X2021990000393 Denomination of invention: A ternary composite silicon carbide refractory and its preparation method Granted publication date: 20200529 License type: Exclusive License Record date: 20210701 |
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