CN105665692A - Thermal shock resistant liner composite body for long nozzle and preparation process thereof - Google Patents
Thermal shock resistant liner composite body for long nozzle and preparation process thereof Download PDFInfo
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- CN105665692A CN105665692A CN201610171560.2A CN201610171560A CN105665692A CN 105665692 A CN105665692 A CN 105665692A CN 201610171560 A CN201610171560 A CN 201610171560A CN 105665692 A CN105665692 A CN 105665692A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
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Abstract
The invention discloses a thermal shock resistant liner composite body for a long nozzle and a preparation process thereof. The liner composite body consists of 30-50% of aggregate, 10-15% of light roasting aluminum oxide, 30-50% of high-temperature pre-synthesized material, 10-15% of magnesium carbonate, and phenolic resin with an adding quantity being 6-10% of total weight of aggregate, light burning aluminum oxide, high-temperature pre-synthesized material and magnesium carbonate. The preparation process comprises the following steps: all the raw materials are weighed according to the weight percentages, are uniformly mixed, and are put in a pelletizer to prepare mixed particles; and the mixed particles are pressed to the liner composite body through a cold isostatic press. The liner composite body contains a lot of micropores uniformly distributed, so that the liner composite body is much lower in heat conductivity compared with a common Al2O3-C material. In addition, the liner composite body is excellent in thermal shock resistance.
Description
Technical field
The present invention relates to cast steel long nozzle, it is specifically related to a kind of long nozzle anti-thermal shock liner complex body and preparation technology thereof.
Background technology
Long nozzle is installed on below steel teeming ladle, is that molten steel injects the A1 of tundish by steel teeming ladle2O3-C matter cylindrical channel, plays a part water conservancy diversion, prevents secondary oxidation of steel and splashing. It realizes molten steel protective casting to improve the important functional refractory of billet quality, and by directly having influence on, can whole casting process normally carry out its service condition. But at the pouring molten steel initial stage, when red-hot steel flow is through long nozzle, very big thermal stresses can be produced therein, thus cause it to ftracture. Therefore, long nozzle must be preheated to more than 1000 DEG C before use, and this not only consumes the energy, degradation manipulation environment, and causes its replacement operation loaded down with trivial details, time-consuming. The exploitation exempting from preheating long nozzle is the key solving this problem.
At present, the body exempting from preheating composite structure long nozzle of widespread use adopts alumina-carbon material, and liner adopts carbon-free material. Its mechanism is: insulating inner lining has less thermal conductivity, that reduces the rate of rise in temperature inside long nozzle; And body has higher thermal conductivity, its flash heat transfer effect makes the temperature difference between long nozzle inwall and outer wall be eased quickly, thus the short-term effectively reducing thermal stresses is gathered, to prevent it ftractures. In addition, when the liner of composite structure long nozzle is thicker, also require that himself there is higher thermal shock resistance. The improvement of material and manufacturing process is the effective means improving long nozzle insulating inner lining thermal shock resistance.
Research shows, when material one timing of insulating inner lining, increasing wherein pore amount is reduce the effective ways of its thermal conductivity. In addition, insulating inner lining is introduced more pore, its Young's modulus can be reduced, thus improve its thermal shock resistance. Introducing more pore in insulating inner lining, one method mixes to add aluminum oxide or Bubble zirconia in inner lining material, but due to the intensity of hollow ball very low, easily crushed and do not have due effect when long nozzle is shaping. Another kind of method mixes to add appropriate graphite in inner lining material, after long nozzle burns till, then enters air to Kong Zhongtong in it, liner is carried out oxidation and decarbonization process.Although the effect of the method is better, but its technological process is comparatively loaded down with trivial details and wayward.
For meeting steel mill to the demand exempting from preheating long nozzle, the application is from the improvement of material and manufacturing process, and introducing two kinds of methods of micro-pore set about, and has developed a kind of long nozzle anti-thermal shock liner complex body.
Summary of the invention
It is an object of the invention to provide a kind of long nozzle anti-thermal shock liner complex body and preparation technology thereof. This liner complex body has lower thermal conductivity, makes long nozzle not need preheating, and good heat-shock resistance, resistance to molten steel can be kept for a long time to wash away.
The technical scheme that the present invention adopts for achieving the above object is: a kind of long nozzle anti-thermal shock liner complex body, it is made up of aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol, the weight percent of each material is: aggregate 30 ~ 50%, calcined alumina 10 ~ 15%, high temperature pre-synthesis material 30 ~ 50%, magnesiumcarbonate 10 ~ 15%, the add-on of resol is the 6 ~ 10% of aggregate, calcined alumina, high temperature pre-synthesis material and magnesiumcarbonate gross weight, wherein, high temperature pre-synthesis material is Al2O3-MgO-TiO2Synthetic material; Described liner complex body inside is containing Al1.8Mg0.1Ti1.1O5Phase.
Further, high temperature pre-synthesis material is prepared from by following technique: adopt weight percent to be followed successively by the Al of 40 ~ 60%2O3Powder, the MgO powder of 5 ~ 10%, the TiO of 30 ~ 50%2Powder more than mixing 16h, is placed in High Temperature Furnaces Heating Apparatus, is incubated 3 ~ 6h at 1500 ~ 1800 DEG C, wherein, and Al2O3Powder, MgO powder and TiO2The mean particle size of powder is all not more than 10 microns.
In the present invention, aggregate is prepared from by following technique: (1), according to the weight ratio of 1:3:3, take microcapsule powder, titanium dioxide and dehydrated alcohol, after mixing under the frequency of 45KHz ultrasonic disperse 25min, then it is carry out taking out filter under the vacuum condition of 0.098MPa in vacuum tightness, stop when no longer including ethanol drips taking out filter, take out much filtrate, it is placed in baking oven, carry out the oven dry of 30 DEG C × 6h and the preheating of 50 DEG C × 20min successively, take out the material after preheating and be placed in pressing machine under 2MPa pressure precompressed 5min, and then at 5MPa, hot pressing 30min under 150 ~ 160 DEG C of conditions, after naturally cooling to room temperature, obtained titanium dioxide microcapsule powder, for subsequent use,
(2), adopt that weight percent is followed successively by the fused corundom of 60 ~ 70%, the magnesia of 28 ~ 34%, the titanium dioxide microcapsule powder of 2 ~ 6% mix, and add the admixture that weight accounts for fused corundom, magnesia and titanium dioxide microcapsule powder gross weight 1 ~ 2.5%, after mixing 1.5h, preheating 3 ~ 5h at 110 ~ 115 DEG C, is then incubated 2 ~ 3h at 1400 ~ 1600 DEG C.
In the present invention, the foreign matter content in described magnesiumcarbonate is not more than the 5% of its deadweight, and mean particle size is not more than 5 microns.
The preparation technology of a kind of long nozzle anti-thermal shock liner complex body; aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol is taken according to above-mentioned weight percent; mix and stir after evenly; it is placed in tablets press and makes composite grain, composite grain is pressed into liner complex body by cold isostatic press.
In the present invention, titanium dioxide microcapsule powder has the balancing effect that stress is concentrated, it is possible to absorb long nozzle surging force in use so that it is shrinkage strain amount reduces; The high workability of titanium dioxide microcapsule powder and small-size effect, make inner lining surface more fine and close carefully clean, and the slag resistance making liner strengthens greatly. Micro encapsulation makes titanium dioxide fine particles mutually isolated, promotes its dispersion in aggregate, can absorb heat of friction in a large number, play the effect delaying long nozzle rise in temperature; And, when titanium dioxide makes liner complex body be applied on long nozzle, reduce the grain-size of glassy phase and crystallization phases.
When the liner complex body of the present invention is applied on long nozzle, magnesiumcarbonate starts decomposition reaction more than 540 DEG C, generates MgO and discharges CO2, form a large amount of micro-pore, thus can effectively reduce thermal conductivity and the Young's modulus of inner lining material.The MgO of above-mentioned formation reacts with calcined alumina further, generates original position magnesium-aluminium spinel.
Useful effect: this liner complex body contains a large amount of equally distributed micro-pore, thus has than common A12O3-C-material low many thermal conductivities. Wherein, the Al contained1.8Mg0.1Ti1.1O5Phase, it is to increase the heat-shock resistance of material. This inner lining material serves the disconnected effect of a thermal resistance, can effectively reduce the long nozzle body thermal stresses suffered when molten steel starts to pour into a mould; The present invention is not containing fused quartz, and in use the reaction in－situ in thermal treatment and use procedure sinters again, it is possible to resist washing away and deteriorating of molten steel preferably; This inner lining material has lower coefficient of thermal expansion and Young's modulus, and the thermal stresses that thus himself thermal expansion produces is less on the impact of long nozzle body. In addition, because this inner lining material and body material exist difference in mechanical property, so the effect suppressing crack propagation can also be played in the interface between them.
Accompanying drawing explanation
Fig. 1 is in conjunction with the standby long nozzle structural representation of liner compound system of the present invention.
Reference numeral: 1, long nozzle body; 2, liner complex body.
Embodiment
Below in conjunction with specific embodiment, the long nozzle anti-thermal shock liner complex body of the present invention and preparation technology thereof are described further, so that the technician of this area can better understand the present invention and can be implemented, but illustrated embodiment is not as a limitation of the invention.
A kind of long nozzle anti-thermal shock liner complex body, it is made up of aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol, the weight percent of each material is: aggregate 30 ~ 50%, calcined alumina 10 ~ 15%, high temperature pre-synthesis material 30 ~ 50%, magnesiumcarbonate 10 ~ 15%, the add-on of resol is the 6 ~ 10% of aggregate, calcined alumina, high temperature pre-synthesis material and magnesiumcarbonate gross weight, wherein, high temperature pre-synthesis material is Al2O3-MgO-TiO2Synthetic material; Described liner complex body inside is containing Al1.8Mg0.1Ti1.1O5Phase.
Wherein, the foreign matter content in described magnesiumcarbonate is not more than the 5% of its deadweight, and mean particle size is not more than 5 microns.
Embodiment 1
The preparation technology of a kind of long nozzle anti-thermal shock liner complex body, this liner complex body is made up of aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol, the weight percent of each material is: aggregate 40%, calcined alumina 10%, high temperature pre-synthesis material 40%, magnesiumcarbonate 10%, the add-on of resol is the 8% of aggregate, calcined alumina, high temperature pre-synthesis material and magnesiumcarbonate gross weight, wherein, high temperature pre-synthesis material is Al2O3-MgO-TiO2Synthetic material; Described liner complex body inside is containing Al1.8Mg0.1Ti1.1O5Phase, comprises the following steps:
Step one, according to the weight ratio of 1:3:3, take microcapsule powder, titanium dioxide and dehydrated alcohol, after mixing under the frequency of 45KHz ultrasonic disperse 25min, then it is carry out taking out filter under the vacuum condition of 0.098MPa in vacuum tightness, stop when no longer including ethanol drips taking out filter, take out much filtrate, it is placed in baking oven, carry out the oven dry of 30 DEG C × 6h and the preheating of 50 DEG C × 20min successively, take out the material after preheating and be placed in pressing machine under 2MPa pressure precompressed 5min, and then at 5MPa, hot pressing 30min under 150 DEG C of conditions, after naturally cooling to room temperature, obtained titanium dioxide microcapsule powder, for subsequent use,
Step 2, adopt that weight percent is followed successively by the fused corundom of 65%, the magnesia of 31%, the titanium dioxide microcapsule powder of 4% mix, and add the admixture that weight accounts for fused corundom, magnesia and titanium dioxide microcapsule powder gross weight 1.5%, after mixing 1.5h, preheating 3h at 115 DEG C, then at 1600 DEG C, it is incubated 2h, obtained aggregate, for subsequent use;
Step 3, employing weight percent are followed successively by the Al of 60%2O3Powder, the MgO powder of 10%, the TiO of 30%2Powder mixing 20h, is placed in High Temperature Furnaces Heating Apparatus, is incubated 3h at 1800 DEG C, obtained high temperature pre-synthesis material; Wherein, Al2O3Powder, MgO powder and TiO2The mean particle size of powder is all not more than 10 microns;
High temperature pre-synthesis material, magnesiumcarbonate and resol prepared by step 4, the aggregate taking step 2 according to described weight percent and preparing, calcined alumina, step 3; mix and stir after evenly; it is placed in tablets press and makes composite grain, composite grain is pressed into liner complex body by cold isostatic press.
Embodiment 2
The preparation technology of a kind of long nozzle anti-thermal shock liner complex body, this liner complex body is made up of aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol, the weight percent of each material is: aggregate 40%, calcined alumina 15%, high temperature pre-synthesis material 30%, magnesiumcarbonate 15%, the add-on of resol is the 10% of aggregate, calcined alumina, high temperature pre-synthesis material and magnesiumcarbonate gross weight, wherein, high temperature pre-synthesis material is Al2O3-MgO-TiO2Synthetic material; Described liner complex body inside is containing Al1.8Mg0.1Ti1.1O5Phase. Take aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol according to described weight percent, mix and stir after evenly, be placed in tablets press and make composite grain, composite grain is pressed into liner complex body by cold isostatic press. Wherein, the preparation technology of aggregate, high temperature pre-synthesis material is with reference to embodiment 1.
Embodiment 3
The preparation technology of a kind of long nozzle anti-thermal shock liner complex body, this liner complex body is made up of aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol, the weight percent of each material is: aggregate 50%, calcined alumina 10%, high temperature pre-synthesis material 30%, magnesiumcarbonate 10%, the add-on of resol is the 6% of aggregate, calcined alumina, high temperature pre-synthesis material and magnesiumcarbonate gross weight, wherein, high temperature pre-synthesis material is Al2O3-MgO-TiO2Synthetic material; Described liner complex body inside is containing Al1.8Mg0.1Ti1.1O5Phase, comprises the following steps:
Step one, according to the weight ratio of 1:3:3, take microcapsule powder, titanium dioxide and dehydrated alcohol, after mixing under the frequency of 45KHz ultrasonic disperse 25min, then it is carry out taking out filter under the vacuum condition of 0.098MPa in vacuum tightness, stop when no longer including ethanol drips taking out filter, take out much filtrate, it is placed in baking oven, carry out the oven dry of 30 DEG C × 6h and the preheating of 50 DEG C × 20min successively, take out the material after preheating and be placed in pressing machine under 2MPa pressure precompressed 5min, and then at 5MPa, hot pressing 30min under 160 DEG C of conditions, after naturally cooling to room temperature, obtained titanium dioxide microcapsule powder, for subsequent use,
Step 2, adopt that weight percent is followed successively by the fused corundom of 70%, the magnesia of 28%, the titanium dioxide microcapsule powder of 2% mix, and add the admixture that weight accounts for fused corundom, magnesia and titanium dioxide microcapsule powder gross weight 2.5%, after mixing 1.5h, preheating 5h at 110 DEG C, then at 1400 DEG C, it is incubated 3h, obtained aggregate, for subsequent use;
Step 3, employing weight percent are followed successively by the Al of 40%2O3Powder, the MgO powder of 10%, the TiO of 50%2Powder mixing 25h, is placed in High Temperature Furnaces Heating Apparatus, is incubated 6h at 1500 DEG C, obtained high temperature pre-synthesis material; Wherein, Al2O3Powder, MgO powder and TiO2The mean particle size of powder is all not more than 10 microns;
High temperature pre-synthesis material, magnesiumcarbonate and resol prepared by step 4, the aggregate taking step 2 according to described weight percent and preparing, calcined alumina, step 3; mix and stir after evenly; it is placed in tablets press and makes composite grain, composite grain is pressed into liner complex body by cold isostatic press.
Embodiment 4
The preparation technology of a kind of long nozzle anti-thermal shock liner complex body, this liner complex body is made up of aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol, the weight percent of each material is: aggregate 35%, calcined alumina 15%, high temperature pre-synthesis material 35%, magnesiumcarbonate 15%, the add-on of resol is the 9% of aggregate, calcined alumina, high temperature pre-synthesis material and magnesiumcarbonate gross weight, wherein, high temperature pre-synthesis material is Al2O3-MgO-TiO2Synthetic material; Described liner complex body inside is containing Al1.8Mg0.1Ti1.1O5Phase, comprises the following steps:
Step one, according to the weight ratio of 1:3:3, take microcapsule powder, titanium dioxide and dehydrated alcohol, after mixing under the frequency of 45KHz ultrasonic disperse 25min, then it is carry out taking out filter under the vacuum condition of 0.098MPa in vacuum tightness, stop when no longer including ethanol drips taking out filter, take out much filtrate, it is placed in baking oven, carry out the oven dry of 30 DEG C × 6h and the preheating of 50 DEG C × 20min successively, take out the material after preheating and be placed in pressing machine under 2MPa pressure precompressed 5min, and then at 5MPa, hot pressing 30min under 157 DEG C of conditions, after naturally cooling to room temperature, obtained titanium dioxide microcapsule powder, for subsequent use,
Step 2, adopt that weight percent is followed successively by the fused corundom of 65%, the magnesia of 31%, the titanium dioxide microcapsule powder of 4% mix, and add the admixture that weight accounts for fused corundom, magnesia and titanium dioxide microcapsule powder gross weight 1.5%, after mixing 1.5h, preheating 3h at 115 DEG C, then at 1600 DEG C, it is incubated 2h, obtained aggregate, for subsequent use;
Step 3, employing weight percent are followed successively by the Al of 52%2O3Powder, the MgO powder of 8%, the TiO of 40%2Powder mixing 18h, is placed in High Temperature Furnaces Heating Apparatus, is incubated 4.5h at 1400 DEG C, obtained high temperature pre-synthesis material; Wherein, Al2O3Powder, MgO powder and TiO2The mean particle size of powder is all not more than 10 microns;
High temperature pre-synthesis material, magnesiumcarbonate and resol prepared by step 4, the aggregate taking step 2 according to described weight percent and preparing, calcined alumina, step 3; mix and stir after evenly; it is placed in tablets press and makes composite grain, composite grain is pressed into liner complex body by cold isostatic press.
Embodiment 5
The preparation technology of a kind of long nozzle anti-thermal shock liner complex body, this liner complex body is made up of aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol, the weight percent of each material is: aggregate 30%, calcined alumina 10%, high temperature pre-synthesis material 50%, magnesiumcarbonate 10%, the add-on of resol is the 8% of aggregate, calcined alumina, high temperature pre-synthesis material and magnesiumcarbonate gross weight, wherein, high temperature pre-synthesis material is Al2O3-MgO-TiO2Synthetic material; Described liner complex body inside is containing Al1.8Mg0.1Ti1.1O5Phase. Take aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol according to described weight percent, mix and stir after evenly, be placed in tablets press and make composite grain, composite grain is pressed into liner complex body by cold isostatic press. Wherein, the preparation technology of aggregate, high temperature pre-synthesis material is with reference to embodiment 3.
For check long nozzle inner lining material of the present invention performance and with body material in conjunction with situation, preparation does not add the control sample of magnesiumcarbonate, and sample 1-sample 5. The composition of sample 1-sample 5 inner lining material is respectively such as embodiment 1-embodiment 5. The batching of control sample inner lining material is magnesium-aluminium spinel 50wt%, calcined alumina 10wt%, Al2O3-MgO-TiO2Synthetic material 40wt%;Bonding agent resol add-on is the 8% of inner lining material gross weight. The batching of body material is adopted to be electric smelting diamantane 52wt%; Calcined alumina 15wt%; Crystalline flake graphite 27wt%; Carborundum powder 5wt%; Norbide 1wt%; Bonding agent resol is the 9% of batching gross weight.
Above-mentioned each inner lining material and body material are mixed respectively in muller, and dries 24h in 60 DEG C. By above-mentioned each sample in 150MPa pressure system, first suppress one layer of body material layer, again at upper press one layer of lining material of body material layer, finally to be prepared into length be 140mm, width is 35mm, it it is highly the examination body of 35mm, the wherein thick about 5mm of upper inner liner material, the thick about 30mm of lower body material. Meanwhile, the inner lining material of each sample is shaping separately with same pressure. Each sample after shaping after 120 DEG C of dry 24h, under nitrogen atmosphere in 1300 DEG C of thermal treatment 3h.
Measure control sample respectively, and the apparent porosity of sample 1-sample 5 inner lining material, observe simultaneously each sample liner and body in conjunction with situation, the results are shown in Table shown in 1.
Table 1 control sample and embodiment 1-5 sample performance
According to result shown in table 1 it will be seen that the liner of all samples and body in conjunction with all right, the thermal expansivity of each inner lining material is also more or less the same. But compared with control sample, sample 1-sample 5 has bigger apparent porosity, thus should have lower thermal conductivity and Young's modulus. And, after 5 samples are carried out 5 thermal shocks respectively, remaining bending strength is all at more than 25MPa, and strength retention is all more than 90%, and heat-shock resistance is excellent.
Claims (5)
1. a long nozzle anti-thermal shock liner complex body, it is characterized in that: be made up of aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol, the weight percent of each material is: aggregate 30 ~ 50%, calcined alumina 10 ~ 15%, high temperature pre-synthesis material 30 ~ 50%, magnesiumcarbonate 10 ~ 15%, the add-on of resol is the 6 ~ 10% of aggregate, calcined alumina, high temperature pre-synthesis material and magnesiumcarbonate gross weight, wherein, high temperature pre-synthesis material is Al2O3-MgO-TiO2Synthetic material; Described liner complex body inside is containing Al1.8Mg0.1Ti1.1O5Phase.
2. a kind of long nozzle anti-thermal shock liner complex body according to claim 1, it is characterised in that: high temperature pre-synthesis material is prepared from by following technique: adopt weight percent to be followed successively by the Al of 40 ~ 60%2O3Powder, the MgO powder of 5 ~ 10%, the TiO of 30 ~ 50%2Powder more than mixing 16h, is placed in High Temperature Furnaces Heating Apparatus, is incubated 3 ~ 6h at 1500 ~ 1800 DEG C, wherein, and Al2O3Powder, MgO powder and TiO2The mean particle size of powder is all not more than 10 microns.
3. a kind of long nozzle anti-thermal shock liner complex body according to claim 1, it is characterized in that: aggregate is prepared from by following technique: (1), according to the weight ratio of 1:3:3, take microcapsule powder, titanium dioxide and dehydrated alcohol, after mixing under the frequency of 45KHz ultrasonic disperse 25min, then it is carry out taking out filter under the vacuum condition of 0.098MPa in vacuum tightness, stop when no longer including ethanol drips taking out filter, take out much filtrate, it is placed in baking oven, carry out the oven dry of 30 DEG C × 6h and the preheating of 50 DEG C × 20min successively, take out the material after preheating and be placed in pressing machine under 2MPa pressure precompressed 5min, and then at 5MPa, hot pressing 30min under 150 ~ 160 DEG C of conditions, after naturally cooling to room temperature, obtained titanium dioxide microcapsule powder, for subsequent use,
(2), adopt that weight percent is followed successively by the fused corundom of 60 ~ 70%, the magnesia of 28 ~ 34%, the titanium dioxide microcapsule powder of 2 ~ 6% mix, and add the admixture that weight accounts for fused corundom, magnesia and titanium dioxide microcapsule powder gross weight 1 ~ 2.5%, after mixing 1.5h, preheating 3 ~ 5h at 110 ~ 115 DEG C, is then incubated 2 ~ 3h at 1400 ~ 1600 DEG C.
4. a kind of long nozzle anti-thermal shock liner complex body according to claim 1, it is characterised in that: the foreign matter content in described magnesiumcarbonate is not more than the 5% of its deadweight, and mean particle size is not more than 5 microns.
5. the preparation technology of a kind of long nozzle anti-thermal shock liner complex body as claimed in claim 1; it is characterized in that: take aggregate, calcined alumina, high temperature pre-synthesis material, magnesiumcarbonate and resol according to weight percent according to claim 1; mix and stir after evenly; it is placed in tablets press and makes composite grain, composite grain is pressed into liner complex body by cold isostatic press.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112759406A (en) * | 2021-03-02 | 2021-05-07 | 北京利尔高温材料股份有限公司 | Carbon-free submerged nozzle lining material and preparation method thereof |
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