CN100497688C - Method of preparing TiC-FeNiCrMo composite material using aluminothermic-fast solidification technology - Google Patents

Method of preparing TiC-FeNiCrMo composite material using aluminothermic-fast solidification technology Download PDF

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CN100497688C
CN100497688C CNB2005101325957A CN200510132595A CN100497688C CN 100497688 C CN100497688 C CN 100497688C CN B2005101325957 A CNB2005101325957 A CN B2005101325957A CN 200510132595 A CN200510132595 A CN 200510132595A CN 100497688 C CN100497688 C CN 100497688C
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fenicrmo
aluminothermy
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carbide
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CN1786234A (en
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席文君
郭海周
张涛
段辉平
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Beihang University
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Abstract

The invention discloses a method of adopting aluminothermy-quick setting technique to manufacture TiC-FeNiCrMo composite and its equipment. The weight percentage of the gained metal alloy basis material FeNiCrMo is 70-97. Carbide strengthening material TiC is 3-30. Its equipment is made up of water cooled-copper mould, power supply unit, and reaction vessel. The reaction vessel is set at the water cooled-copper mould. Tungsten filament is connected to the positive negative electrode to the power supply unit. Heat insulating material is filled between graphite pipe and shell body. The other end of the graphite pipe is set aluminium foil. The cooling water circulation chamber of the water cooled-copper mould is formed S shape. Forming chamber is funnel shape. The technique combines the aluminothermy method and the quick setting technique to pour fused mass product into copper model, utilizes high copper metal thermal conductivity to quickly cool and solidify to gain small crystal grain TiC strengthening melt composite.

Description

A kind of method that adopts aluminothermy-fast solidification technology to prepare the TiC-FeNiCrMo matrix material
Technical field
The present invention relates to a kind of preparation method that thermite process is combined with fast solidification technology, the melt product that the thermite reduction reaction is obtained directly is injected in the copper mould, utilize the high characteristic of copper metal heat-conducting coefficient realize the melt product quick cooling, solidify, thereby obtain the TiC-FeNiCrMo matrix material that metallographic phase and ceramic phase mix.
Background technology
At present, carbide enhancing metal composite mainly adopts powder metallurgy process and liquid metal-carbide hybrid system preparation.
Wherein, the process of powder metallurgy process is, before this with metallic substance with ceramic powder mixes after press forming strengthens metal composite after sintering obtains carbide.The carbide of powder metallurgic method preparation strengthens metal composite has certain hole and grain-size big.The ceramic phase surface is vulnerable to pollute in preparation process, thereby causes the bonding strength of ceramic phase and metallographic phase to reduce.In addition, last sintering process also makes grain growth easily, and the carbide that is difficult to obtain thin crystalline substance strengthens metal composite.
Wherein, the technological process of liquid metal-carbide hybrid system is that elder generation joins the metallic substance fusing in the liquid metal melt then with carbide particle, obtain carbide and strengthen metal composite after cooling.Distribution of carbides is even inadequately in the matrix material of this method preparation, and particle is bigger, and the carbide particle surface is polluted easily, influences the wettability between carbide and the metallic matrix.
The Mo element has the reinforced alloys matrix, and the high-temperature wearable effect that improves matrix material.
Summary of the invention
One of purpose of the present invention is the method that proposes a kind of TiC-FeNiCrMo of preparation matrix material, this method combines thermite process with fast solidification technology, flow into the forming cavity of copper mold behind the high-temperature fusant burn through aluminium foil that produces by raw-material redox reaction after cooling, solidify and make carbide and strengthen metal composite.
Two of purpose of the present invention provides the little and uniform TiC-FeNiCrMo matrix material of composition of a kind of grain-size.
Three of purpose of the present invention provides a kind of aluminothermy-quick solidification apparatus that is used to prepare the TiC-FeNiCrMo matrix material, and this apparatus structure is reasonable in design, has simplified preparation section, has reduced the preparation cost of material.
The present invention is a kind of method that adopts aluminothermy-fast solidification technology to prepare the TiC-FeNiCrMo matrix material, includes following steps:
(A) take by weighing the starting material that make aluminothermy-rapid solidification after an amount of metal oxide, titanium valve, carbon dust and aluminium powder mix at normal temperatures, and starting material are packed in the carbon tube of aluminothermy-quick solidification apparatus;
40～75wt% metal oxide, 8～20wt% titanium valve, 2～10wt% carbon dust and 15～30wt% aluminium powder are arranged in the starting material;
(B) flow velocity of regulating in the cooling water circulation chamber is 0.3～0.5m 3/ min;
Regulate supply unit output voltage 10～36V, output rating 1800～2500W;
(C) switch on the opening power device, tungsten filament igniting produces under 1800～2500 ℃ the hot conditions starting material and is lighted in carbon tube;
The metal oxide that takes by weighing in above-mentioned under hot conditions (A) step is reduced by aluminium Al, produces redox reaction, obtains TiC, Fe, Ni, Cr, Mo and Al 2O 3Blend melt;
In redox reaction, the Al in the above-mentioned blend melt 2O 3Float on the top of metal and carbide blend melt, under the effect of gravity, flow into behind described metal and the carbide blend melt burn through aluminium foil in the forming cavity of water cooled copper mould, cooled and solidified becomes the TiC-FeNiCrMo matrix material fast.
Described employing aluminothermy-fast solidification technology prepares the method for TiC-FeNiCrMo matrix material, and its metal oxide is: the Fe of 20～50wt% 2O 3, the NiO of 20～40wt%, the Cr of 10～15wt% 2O 3, 10～15wt% CrO 3MoO with 10～20wt% 3, the perhaps Cr of the NiO of the FeO of 20～50wt%, 20～40wt%, 15～20wt% 2O 3, 5～10wt% CrO 3MoO with 10～20wt% 3, the perhaps Fe of 20～50wt% 3O 4, the NiO of 20～40wt%, the Cr of 15～20wt% 2O 3, 5～15wt% CrO 3MoO with 10～15wt% 3
Described employing aluminothermy-fast solidification technology prepares the method for TiC-FeNiCrMo matrix material, described aluminium powder is that particle diameter is the simple substance aluminium powder of 0.5～500 μ m, the particle diameter of described metal oxide is 0.5～200 μ m, the particle diameter of described titanium valve is 0.1～200 μ m, and the particle diameter of described carbon dust is 0.1～200 μ m.
A kind of TiC-FeNiCrMo matrix material that adopts aluminothermy-fast solidification technology to prepare of the present invention, strengthening body by alloy base material and carbide forms, the weight percent of described alloy base material FeNiCrMo is 70～97, and the weight percent that described carbide strengthens body material TiC is 3～30; The weight percent of iron Fe is 20～60 in its alloy base material, the weight percent of nickel is 20～40, the weight percent of chromium Cr be 17～30 and the weight percent of molybdenum Mo be 3～10.
Described TiC-FeNiCrMo matrix material is Ti 6C 6Fe 40Ni 25Cr 17Mo 6Perhaps Ti 6C 6Fe 20Ni 40Cr 20Mo 8Perhaps Ti 6C 6Fe 20Ni 30Cr 30Mo 8
A kind of aluminothermy-quick solidification apparatus that is used to prepare the TiC-FeNiCrMo matrix material of the present invention comprises water cooled copper mould, supply unit and reaction vessel, and reaction vessel is installed on the water cooled copper mould, and the tungsten filament in the reaction vessel is connected with supply unit; Described reaction vessel is made of housing, carbon tube, lagging material, tungsten filament and aluminium foil, filled thermal insulation materials is between carbon tube and housing, tungsten filament is installed on the end cap of carbon tube, and the two ends of tungsten filament are stretched out carbon tube and are connected with the positive and negative electrode of supply unit, and the other end port of carbon tube is provided with aluminium foil; The cooling water circulation chamber of described water cooled copper mould is a S shape, and its forming cavity is a doline, and flare opening and carbon tube port size are adaptive.
Preparation technology of the present invention has utilized the high characteristic of carbide fusing point, carbide at first in the melt that reaction obtains forming core, separate out.In process of setting, carbide provides the forming core place for metal melt, and metal melt is at carbide surface heterogeneous body forming core.Just the forming core carbide of separating out is very tiny, and distribution disperse, evenly is for metal melt provides a large amount of heterogeneous body forming core places.In addition, utilized the characteristic of rapid solidification, utilization copper mold fast cooling technology improves the solution speed of cooling, solidifying cooling rate accelerates, the carbide of a large amount of forming cores and the metallic matrix nucleus has little time to grow up or can not get sufficient room owing to growing up simultaneously at a high speed,, thereby obtain the tiny carbide of crystal grain and strengthen metal composite, because the dispersion-strengthened action of the tiny and carbide of crystal grain, the carbide of aluminothermy-fast solidification technology preparation strengthen the intensity of metal composite, toughness, performance such as wear-resisting is improved significantly.
Description of drawings
Fig. 1 is the structural representation of aluminothermy-quick solidification apparatus of the present invention.
Fig. 2 is Ti 6C 6Fe 40Ni 25Cr 17Mo 6The compression experiment stress-strain curve of matrix material.
Fig. 3 A is Ti 6C 6Fe 40Ni 25Cr 17Mo 6The electron-microscope scanning figure of matrix material.
Fig. 3 B is Ti 6C 6Fe 40Ni 25Cr 17Mo 6Electron-microscope scanning figure after the experience wear of matrix material.
Among the figure: 1. water cooled copper mould 101. cooling water circulation chambeies 102. forming cavities
2. reaction vessel 201. carbon tubes 202. lagging materials 203. aluminium foils 204. housings
205. tungsten filament 3. raw materials
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
See also shown in Figure 1, a kind of aluminothermy-quick solidification apparatus that is used to prepare the TiC-FeNiCrMo matrix material of the present invention, comprise water cooled copper mould 1, supply unit and reaction vessel 2, reaction vessel 2 is installed on the water cooled copper mould 1, and the tungsten filament 205 in the reaction vessel 2 is connected with supply unit; Described reaction vessel 2 is made of housing 204, carbon tube 201, lagging material 202, tungsten filament 205 and aluminium foil 203, lagging material 202 is filled between carbon tube 201 and the housing 204, tungsten filament 205 is installed on the end cap of carbon tube 201, and the two ends of tungsten filament 205 are stretched out carbon tube 201 and are connected with the positive and negative electrode of supply unit, and the other end port of carbon tube 201 is provided with aluminium foil 203; The cooling water circulation chamber 101 of described water cooled copper mould 1 is a S shape, and its forming cavity 102 is dolines, and flare opening and carbon tube 201 port size are adaptive.Described supply unit output voltage is 10V～36V, and output rating is 1800W～2500W; Described lagging material 202 is alumina firebrick or refractory fireclay block; The diameter of described tungsten filament 205 is 0.5～1mm.
The present invention is a kind of method that adopts aluminothermy-fast solidification technology to prepare the TiC-FeNiCrMo matrix material, it is characterized in that including following steps:
(A) take by weighing the starting material 3 that make aluminothermy-rapid solidification after an amount of metal oxide, titanium valve, carbon dust and aluminium powder mix at normal temperatures, and starting material 3 are packed in the carbon tube 201 of aluminothermy-quick solidification apparatus;
40～75wt% metal oxide, 8～20wt% titanium valve, 2～10wt% carbon dust and 15～30wt% aluminium powder are arranged in the starting material 3;
(B) flow velocity of regulating in the cooling water circulation chamber 101 is 0.3～0.5m 3/ min;
Regulate supply unit output voltage 10～36V, output rating 1800～2500W;
(C) switch on the opening power device, tungsten filament 205 igniting, starting material 3 are lighted under the hot conditions of 1800～2500 ℃ of generations carbon tube 201 in;
The metal oxide that takes by weighing in above-mentioned under hot conditions (A) step is reduced by aluminium Al, produces redox reaction, obtains TiC, Fe, Ni, Cr, Mo and Al 2O 3Blend melt;
In redox reaction, the Al in the above-mentioned blend melt 2O 3Float on the top of metal and carbide blend melt, under the effect of gravity, described metal and carbide blend melt burn through aluminium foil 203 backs flow in the forming cavity 102 of water cooled copper mould 1, and cooled and solidified becomes the TiC-FeNiCrMo matrix material fast.
In (C) of aluminothermy-rapid solidification preparation method of the present invention step, behind " startup " switch of pressing on the supply unit, tungsten filament 205 energising back heatings, the starting material 3 in the carbon tube 201 have been lighted, chemical reaction takes place in starting material 3, release of heat makes temperature in the carbon tube 201 reach high temperature more than 3200 ℃.Metal oxide (is chosen metal oxide according to prepared metal matrix material, three groups in patent application of the present invention, are disclosed, these three groups of metal oxides will be described hereinafter) in redox reaction as reductive agent aluminium Al powder, the aluminium oxide Al that density is little 2O 3Melt floats on the top of metal+carbide blend melt; Under hot conditions, the metal of carbon tube 201 bottoms+carbide blend melt at first burn through aluminium foil 203 flows in the forming cavity 102 of water cooled copper mould 1, realize quick cooled and solidified by quick mobile water coolant in the cooling water circulation chamber 101, open water cooled copper mould 1 then, taking out surface coverage has aluminium oxide Al 2O 3The matrix material of slag blanket is removed slag blanket and has just been obtained TiC-FeNiCrMo composite material section bar of the present invention.
In the present invention, cooled and solidified technology is relevant with the grain-size of the size of forming cavity 102, cooling water circulation chamber 101 flow velocities, metal+carbide blend melt fast, material structure is tiny in order to obtain, weave construction even, no large dendritic crystal, just can realize by the flow velocity of regulating cooling water circulation chamber 101, its quick cooled and solidified technology is simple, easy to operate.
In redox reaction, the melting temperature of TiC is 3150 ℃, make all product fusings, then requires the fusing point of the reaction adiabatic temperature of starting material 3 greater than TiC.Reaction product Fe, Ni, Cr, TiC and Al under 3200 ℃ of conditions 2O 3All be molten state, because the density difference of product, under gravity condition, the Al that density is little 2O 3Float on top and form Al 2O 3Section layer (perhaps slag blanket) is removed this slag blanket at last.
In the present invention, the component one of metal oxide is: the Fe of 20～50wt% 2O 3, the NiO of 20～40wt%, the Cr of 10～15wt% 2O 3, 10～15wt% CrO 3MoO with 10～20wt% 3, the component two of metal oxide is: the Cr of the FeO of 20～50wt%, the NiO of 20～40wt%, 15～20wt% 2O 3, 5～10wt% CrO 3MoO with 10～20wt% 3, the component three of metal oxide is: the Fe of 20～50wt% 3O 4, the NiO of 20～40wt%, the Cr of 15～20wt% 2O 3, 5～15wt% CrO 3MoO with 10～15wt% 3Use the CrO of equal quantities between the each component 3Cr in the surrogate response thing 2O 3Can improve adiabatic temperature, more help the starting material 3 in the carbon tube 201 are fused into melt.The metal oxide particle diameter that is adopted is 0.5～200 μ m, and the particle diameter of titanium valve is 0.1～200 μ m, and the particle diameter of described carbon dust is 0.1～200 μ m, and the aluminum reduction agent is that particle diameter is the simple substance aluminium powder of 0.5～500 μ m.Microstructure, tissue topography, hardness and wear resisting property according to the different preparation-obtained TiC-FeNiCrMoO matrix materials of component are different.
Embodiment 1:The Ti of system 500g 6C 6Fe 40Ni 25Cr 17Mo 6Matrix material
Take by weighing the C of Ti, the 7.2g of 28.8g, the Fe of 287g 2O 3, the NiO of 168g, the Cr of 84.8g 2O 3, 41g CrO 3, 72.3g MoO 3With the Al of 218.5g, the particle diameter of above-mentioned materials is 50 μ m, in the carbon tube 201 of the aluminothermy-quick solidification apparatus as shown in Figure 1 of packing into after mixing.
The forming cavity 102 of the water cooled copper mould of selecting for use during preparation 1 is that diameter is the circle of 3cm, and it regulates water coolant flow velocity 0.03m 3/ min, supply unit output voltage 12V, output rating 2000W.
Behind the switch of pressing on the supply unit, above-mentioned raw materials in the carbon tube 201 is lighted by tungsten filament 205, redox reaction takes place, obtain blend melt, after aluminium foil 203 was by burn through, blend melt flowed in the forming cavity 102 of water cooled copper mould 1, the water that is cooled is frozen into cylindric fast, open water cooled copper mould 1, take out columned matrix material, remove the Al on cylindric top 2O 3Slag blanket promptly obtains Ti 6C 6Fe 40Ni 25Cr 17Mo 6Matrix material.
The above-mentioned Ti for preparing 6C 6Fe 40Ni 25Cr 17Mo 6Matrix material is used scanning electron microscopic observation tissue topography, sees also shown in Fig. 3 A and Fig. 3 B, and this microstructure of composite is fine and closely woven, and the TiC crystal grain in the material is 1.8 μ m, and the Fe-Ni-Cr crystal grain in the material is less than 1 μ m.Measure this Ti with MTS material comprehensive test machine 6C 6Fe 40Ni 25Cr 17Mo 6The compressive strength of matrix material is 2750MPa (as shown in Figure 2).
Embodiment 2:The Ti of system 500g 6C 6Fe 20Ni 40Cr 20Mo 8Matrix material
Take by weighing NiO, the Cr of 84.8g of FeO, 261.4g of C, 125.2g of Ti, the 7.2g of 28.8g 2O 3, 69.6g CrO 3, 100.2g MoO 3With the Al of 199.3g, the particle diameter of above-mentioned materials is 50 μ m, in the carbon tube 201 of the aluminothermy-quick solidification apparatus as shown in Figure 1 of packing into after mixing.
The forming cavity 102 of the water cooled copper mould of selecting for use during preparation 1 is that diameter is the circle of 3cm, and it regulates water coolant flow velocity 0.03m 3/ min, supply unit output voltage 12V, output rating 2000W.
Behind the switch of pressing on the supply unit, above-mentioned raw materials in the carbon tube 201 is lighted by tungsten filament 205, redox reaction takes place, obtain blend melt, after aluminium foil 203 was by burn through, blend melt flowed in the forming cavity 102 of water cooled copper mould 1, the water that is cooled is frozen into cylindric fast, open water cooled copper mould 1, take out columned matrix material, remove the Al on cylindric top 2O 3Slag blanket promptly obtains Ti 6C 6Fe 20Ni 40Cr 20Mo 8Matrix material.
The above-mentioned Ti for preparing 6C 6Fe 20Ni 40Cr 20Mo 8Matrix material is used scanning electron microscopic observation tissue topography, and this microstructure of composite is fine and closely woven, and the TiC crystal grain in the material is 1.8 μ m, and the Fe-Ni-Cr crystal grain in the material is less than 1 μ m.Measure this Ti with MTS material comprehensive test machine 6C 6Fe 20Ni 40Cr 20Mo 8The compressive strength of matrix material is 2420MPa.
Embodiment 3:The Ti of system 500g 6C 6Fe 20Ni 30Cr 30Mo 8Matrix material
Take by weighing the C of Ti, the 7.2g of 28.8g, the Fe of 45.9g 3O 4, the NiO of 200.0g, the Cr of 84.8g 2O 3, 155.2g CrO 3, 102.3g MoO 3With the Al of 243.0g, the particle diameter of above-mentioned materials is 50 μ m, in the carbon tube 201 of the aluminothermy-quick solidification apparatus as shown in Figure 1 of packing into after mixing.
The forming cavity 102 of the water cooled copper mould of selecting for use during preparation 1 is that diameter is the circle of 3cm, and it regulates water coolant flow velocity 0.03m 3/ min, supply unit output voltage 12V, output rating 2000W.
Behind the switch of pressing on the supply unit, above-mentioned raw materials in the carbon tube 201 is lighted by tungsten filament 205, redox reaction takes place, obtain blend melt, after aluminium foil 203 was by burn through, blend melt flowed in the forming cavity 102 of water cooled copper mould 1, the water that is cooled is frozen into cylindric fast, open water cooled copper mould 1, take out columned matrix material, remove the Al on cylindric top 2O 3Slag blanket promptly obtains Ti 6C 6Fe 20Ni 30Cr 30Mo 8Matrix material.
The above-mentioned Ti for preparing 6C 6Fe 20Ni 30Cr 30Mo 8Matrix material is used scanning electron microscopic observation tissue topography, and this microstructure of composite is fine and closely woven, and the TiC crystal grain in the material is 1.8 μ m, and the Fe-Ni-Cr crystal grain in the material is less than 1 μ m.Measure this Ti with MTS material comprehensive test machine 6C 6Fe 20Ni 30Cr 30Mo 8The compressive strength of matrix material is 2380MPa.
The TiC-FeNiCrMo matrix material that the present invention obtains: alloy base is ultrafine-grained (UFG) microstructure even is nanostructure, has excellent more mechanical property than general cast alloy, the carbide such as TiC that are used for wild phase, not only can refinement matrix structure, can also play the effect of dispersion-strengthened.
Aluminothermy-fast solidification technology among the present invention is compared with above-mentioned two kinds of technologies and had the following advantages: 1, the thermite reaction thermal discharge is big, the adiabatic temperature height, all reaction product that comprise dystectic carbide all are in molten state, therefore can use castmethod to obtain complex-shaped fine and close workpiece; 2, the carbide reaction in generates, with metallographic phase bonding strength height; 3,, can obtain the thinner carbide of crystal grain and strengthen metal composite by the quick cooled and solidified of copper mold; 4, cost is low, and technology is simple, and prepared carbide strengthens the metal composite excellent performance.In addition, the present invention uses aluminium powder to make reductive agent, at first is because aluminium powder is lower than the price of reductive agents such as magnesium, zirconium and titanium, secondly is because the oxide products that obtains as reductive agent with aluminium is an aluminum oxide, the wettability of it and metal melting product is relatively poor, so aluminum oxide separates with metallic product easily.
TiC-FeNiCr matrix material of the present invention has the excellent abrasive energy, good high-temperature corrosion resistance performance is arranged under the hot environment, not only can be used as structured material, and be a kind of important coated material, be widely used in machinery, chemical industry, oil and national defence field.

Claims (2)

1, a kind of method that adopts aluminothermy-fast solidification technology to prepare the TiC-FeNiCrMo matrix material is characterized in that including following steps:
(A) take by weighing the starting material (3) that make aluminothermy-rapid solidification after an amount of metal oxide, titanium valve, carbon dust and aluminium powder mix at normal temperatures, and starting material (3) are packed in the carbon tube (201) of aluminothermy-quick solidification apparatus;
40～75wt% metal oxide, 8～20wt% titanium valve, 2～10wt% carbon dust and 15～30wt% aluminium powder are arranged in the starting material (3);
Described metal oxide is the Fe of 20～50wt% 2O 3, the NiO of 20～40wt%, the Cr of 10～15wt% 2O 3, 10～15wt% CrO 3MoO with 10～20wt% 3Perhaps
The Cr of the FeO of 20～50wt%, the NiO of 20～40wt%, 15～20wt% 2O 3, 5～10wt% CrO 3MoO with 10～20wt% 3Perhaps
The Fe of 20～50wt% 3O 4, the NiO of 20～40wt%, the Cr of 15～20wt% 2O 3, 5～15wt% CrO 3MoO with 10～15wt% 3
(B) flow velocity of regulating in the cooling water circulation chamber (101) is 0.3～0.5m 3/ min;
Regulate supply unit output voltage 10～36V, output rating 1800～2500W;
(C) switch on the opening power device, tungsten filament (205) igniting, starting material (3) are lighted under the hot conditions of 1800～2500 ℃ of generations carbon tube (201) in;
The metal oxide that takes by weighing in above-mentioned under hot conditions (A) step is reduced by aluminium Al, produces redox reaction, obtains TiC, Fe, Ni, Cr, Mo and Al 2O 3Blend melt;
In redox reaction, the Al in the above-mentioned blend melt 2O 3Float on the top of metal and carbide blend melt, under the effect of gravity, described metal and carbide blend melt burn through aluminium foil (203) back flow in the forming cavity (102) of water cooled copper mould (1), and cooled and solidified becomes the TiC-FeNiCrMo matrix material fast.
2, employing aluminothermy-fast solidification technology according to claim 1 prepares the method for TiC-FeNiCrMo matrix material, it is characterized in that: described aluminium powder is that particle diameter is the simple substance aluminium powder of 0.5～500 μ m, the particle diameter of described metal oxide is 0.5～200 μ m, the particle diameter of described titanium valve is 0.1～200 μ m, and the particle diameter of described carbon dust is 0.1～200 μ m.
CNB2005101325957A 2005-12-27 2005-12-27 Method of preparing TiC-FeNiCrMo composite material using aluminothermic-fast solidification technology Expired - Fee Related CN100497688C (en)

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CN1786232A (en) * 2005-12-27 2006-06-14 北京航空航天大学 Method of preparing Mo2C-FeNiCr compsite material using aluminothermic-fast solidfication technology and its device
CN1786249A (en) * 2005-12-27 2006-06-14 北京航空航天大学 TiB2-FeNiCr composite material and its preparation method and aluminothermic fast solieification device
CN1786233A (en) * 2005-12-27 2006-06-14 北京航空航天大学 Method of preparing WC-FeNiCr composite material using aluminothermic-fast solification technology and its device
CN1786231A (en) * 2005-12-27 2006-06-14 北京航空航天大学 Method of preparing TaC-FeNiCr composite material using aluminium tbermo-fast solidificntion technology and device thereof
CN1786235A (en) * 2005-12-27 2006-06-14 北京航空航天大学 Method of preparing WB-FeNiCr composite material alnminothermic-fast solidification technology and its device
CN1789470A (en) * 2005-12-27 2006-06-21 北京航空航天大学 CrB2-FeNiCr composite material, its preparation method and aluminothermy-quick solidification apparatus
CN1789447A (en) * 2005-12-27 2006-06-21 北京航空航天大学 Method and apparatus for preparing VC-FeNiCr composite material by employing aluminothermy-quick solidification process
CN1793392A (en) * 2005-12-27 2006-06-28 北京航空航天大学 Process for preparing Cr7C3-FeNiCr composite by heating aluminium fast solidification tech, and apparatus thereof

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