CN103060587A - Niobium-aluminum alloying molybdenum disilicide material and preparation method thereof - Google Patents

Niobium-aluminum alloying molybdenum disilicide material and preparation method thereof Download PDF

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Publication number
CN103060587A
CN103060587A CN2013100353564A CN201310035356A CN103060587A CN 103060587 A CN103060587 A CN 103060587A CN 2013100353564 A CN2013100353564 A CN 2013100353564A CN 201310035356 A CN201310035356 A CN 201310035356A CN 103060587 A CN103060587 A CN 103060587A
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niobium
molybdenum disilicide
base substrate
disilicide material
powder
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王晓虹
陆琼
朱高明
吴光志
孙智
冯培忠
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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Abstract

The invention relates to a niobium-aluminum alloying molybdenum disilicide material and a preparation method thereof, and belongs to the technical field of intermetallic compounds. The chemical formula of the niobium-aluminum alloying molybdenum disilicide material is (Mo1-xNbx)(Si1-yAly)2, wherein X ranges from 0 to 0.15, and Y ranges from 0 to 0.15. The preparation method comprises the following steps of: uniformly mixing molybdenum, niobium, silicon and aluminum powder at a mole ratio of (28.305-33.3):(0-4.995):(56.695-66.7):(0-10.005); then pressing the mixture into a blank; and placing the blank into a combustion synthesis device, and igniting the blank in a protective atmosphere to synthesize the niobium-aluminum alloying molybdenum disilicide material. Compared with the prior art, the niobium-aluminum alloying molybdenum disilicide material disclosed by the invention can be synthesized through a one-step method and has the advantages of good high-temperature strength, simple process and equipment, time and energy conservation, low cost and less pollution.

Description

Niobium and aluminium alloying molybdenum disilicide material and preparation method thereof
Technical field
The invention belongs to the Intermetallic Compound Technology field, especially relate to a kind of niobium and aluminium alloying molybdenum disilicide material and preparation method thereof.
Background technology
MoSi 2With its higher fusing point (2030 ℃), moderate density (6.24gcm -3), good electric heating conductivity (resistivity 21.50 * 10 -6Ω cm, thermal conductivity 25Wm -1K -1), lower thermal expansivity (8.1 * 10 -6K -1), the advantage such as excellent high-temperature oxidation resistance (oxidation resistance temperature can reach 1600 ℃) and be considered to the thermal structure candidate material that has competitive power of appearance continue Ni base superalloy, TiAl based compound and structural ceramics after.MoSi 2Reached 1800 ℃ as the aerial maximum operation (service) temperature of electrical heating element, still, MoSi 2Practicalization as structured material is also slower, mainly is because MoSi 2Have that Toughness is poor, hot strength is low and middle temperature Pesting phenomenon three large defectives.
At present, to MoSi 2The main path that carries out highly malleablized is to add the third element (W, Nb, Al, Ti etc.) alloying or second-phase (SiC, ZrB 2, Si 3N 4, La 2O 3Deng) Composite.Nb is considered to a kind of important Toughened Materials, successively has the Nb of employing powder, Nb fiber, Nb paper tinsel to prepare Nb/MoSi 2Matrix material, Nb alloying preparation (MoNb) Si 2And MoSi 2/ NbSi 2Research.Waghmare and Bulatov etc. calculate from first principle and show that Nb is MoSi 2One of element at infinity of alloying, the Nb alloying can promote MoSi 2The low temperature dislocation motion increases Toughness.Adopt the Nb alloying, Nb replaces MoSi 2The position of middle part Mo forms NbSi 2, NbSi 2Has higher fusing point (1935 ℃), lower density (5.45g.cm -3), especially can be to MoSi 2Produce unusual the reinforcement, make it the intensity climax occur at 1600 ℃, reduce simultaneously the density of matrix material, might obtain the toughness reinforcing double effects with the high temperature reinforcement of room temperature.The Nb alloying is obtaining good effect aspect the Ti-Al series intermetallic compound highly malleablized, still, and about Nb alloying MoSi 2Report but relatively less.
Al is a kind of early alloy element of research, and Al can replace MoSi 2The position of Si in the structure cell forms Mo (Si, Al) 2, the ratio of increase metallic bond improves MoSi 2The energy-to-break of crystal grain.According to the Mo-Si-Al phasor, Al is at Cll bType MoSi 2In the about 3at.% of maximum solid solution degree, along with the increase of Al content, Cll will occur in crystal structure of alloy b→ C40 → C54 changes.The preparation such as Maruyama is also found Mo (Si 0.86, Al 0.14) 2Material is obviously suppressed 500 ℃ Pest phenomenon.The employing arc melting techniques such as Sharif have prepared Mo (Si, 2at.%Al) 2Material, this material and MoSi 2Compare, show preferably 1300 ℃ of low temperature (＜600 ℃) solid solution softenings and high temperature (〉) solid solution strengthening effect.Dasgupta etc. find Cll bType Mo (Si, Al) 2Hardness value increase along with the increase of Al content.But from going result, the Al alloying is also not obvious to the contribution of Room-Temperature Fracture Toughness.
At present diversification is one of development trend of high temperature intermetallics, and namely matrix alloy to ternary and even polynary future development, if can use multi-element alloyed coupling, is comprehensively brought into play the characteristic of different-alloy element by binary, then might make MoSi 2Obtain the performance of expectation.Multicomponent microalloying is all being obtained positive effect aspect the mechanical property of improving Ni base superalloy and TiAl intermetallic compound and the Laves phase hydrogen storage alloy electrochemical properties; And in the industrial alloy of practical application, except the only a few binary alloy, the overwhelming majority is multicomponent alloy, thereby is necessary to carry out the collaborative Nb alloying MoSi of Al 2Research.
Summary of the invention
The object of the present invention is to provide a kind of niobium and aluminium alloying molybdenum disilicide material and preparation method thereof, realize that niobium and aluminium substitute respectively molybdenum in the molybdenum disilicide and the alloying of silicon, and method and apparatus is easy.
The chemical expression of niobium of the present invention and aluminium alloying molybdenum disilicide material is (Mo 1-xNb x) (Si 1-yAl y) 2, wherein X is within 0～0.15 the scope, and Y is within 0～0.15 the scope.
Technique of the present invention is:
(1) molybdenum, niobium, silicon, aluminium powder form are mixed according to 28.305～33.3mol%Mo, 0～4.995mol%Nb, 56.695～66.7mol%Si, 0～10.005mol%Al molar ratio;
(2) powder compression that mixes is become base substrate;
(3) the mixed powder base substrate is put into combustion and synthesis device, in the protective atmospheres such as argon gas, hydrogen or nitrogen, light the mixed powder base substrate, the synthetic niobium of chemical reaction and aluminium alloying molybdenum disilicide material occur.
Compared with the prior art, the present invention adopts combustion synthesis technology, prepared fast molybdenum niobium silumin take element powders as raw material, realized that the collaborative alloying of niobium and aluminum binary is to the modification of molybdenum disilicide material, be conducive to reduce the ratio that in the molybdenum disilicide fragility is affected larger molybdenum silicon key, can play collaborative alloy highly malleablized effect.Compare with reaction sintering technology, reduced the remnants of reactant; Compare with the mechanical alloy metallization processes, alleviated the pollution of abrading-ball and ball grinder, avoided long-time ball milling to the consumption of Energy resources; Thereby the present invention have technology and equipment easy, save time, cost is low, pollute few advantage.
Description of drawings
Fig. 1 is the X ray diffracting spectrum that the present invention obtains product, can find out, can access niobium and aluminium alloying molybdenum disilicide material according to the present invention.
Fig. 2 is the X ray diffracting spectrum that the present invention obtains product, can find out, can access niobium and aluminium alloying molybdenum disilicide material according to the present invention.
Fig. 3 is the element energy spectrum analysis collection of illustrative plates that the present invention obtains product, can find out, contains four kinds of elements of molybdenum niobium sial in the resulting materials.
Embodiment
Embodiment 1. mixes the powder of molybdenum, niobium, silicon, aluminium according to 33.3mol%Mo, 0mol%Nb, 66.7mol%Si, 0mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the argon gas atmosphere environment, synthetic MoSi reacts 2Its hot strength reaches 118MPa behind sintering densification.
Embodiment 2. mixes the powder of molybdenum, niobium, silicon, aluminium according to 32.301mol%Mo, 0.999mol%Nb, 66.7mol%Si, 0mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the hydrogen atmosphere environment, synthetic (Mo reacts 0.97Nb 0.03) Si 2
Embodiment 3. mixes the powder of molybdenum, niobium, silicon, aluminium according to 30.303mol%Mo, 2.997mol%Nb, 66.7mol%Si, 0mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the nitrogen atmosphere environment, synthetic (Mo reacts 0.91Nb 0.09) Si 2
Embodiment 4. mixes the powder of molybdenum, niobium, silicon, aluminium according to 28.305mol%Mo, 4.995mol%Nb, 66.7mol%Si, 0mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the argon gas atmosphere environment, synthetic (Mo reacts 0.85Nb 0.15) Si 2
Embodiment 5. mixes the powder of molybdenum, niobium, silicon, aluminium according to 33.3mol%Mo, 0mol%Nb, 64.699mol%Si, 2.001mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the hydrogen atmosphere environment, synthetic Mo (Si reacts 0.97Al 0.03) 2
Embodiment 6. mixes the powder of molybdenum, niobium, silicon, aluminium according to 33.3mol%Mo, 0mol%Nb, 60.697mol%Si, 6.003mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the nitrogen atmosphere environment, synthetic Mo (Si reacts 0.91Al 0.09) 2
Embodiment 7. mixes the powder of molybdenum, niobium, silicon, aluminium according to 33.3mol%Mo, 0mol%Nb, 56.695mol%Si, 10.005mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the argon gas atmosphere environment, synthetic Mo (Si reacts 0.85Al 0.15) 2
Embodiment 8. mixes the powder of molybdenum, niobium, silicon, aluminium according to 32.301mol%Mo, 0.99mol%Nb, 64.699mol%Si, 2.001mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the hydrogen atmosphere environment, synthetic (Mo reacts 0.97Nb 0.03) (Si 0.97Al 0.03) 2Its hot strength reaches 187MPa behind sintering densification.
Embodiment 9. mixes the powder of molybdenum, niobium, silicon, aluminium according to 28.305mol%Mo, 4.995mol%Nb, 64.699mol%Si, 2.001mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the hydrogen atmosphere environment, synthetic (Mo reacts 0.97Nb 0.15) (Si 0.97Al 0.03) 2Its hot strength reaches 252MPa behind sintering densification.
Embodiment 10. mixes the powder of molybdenum, niobium, silicon, aluminium according to 30.303mol%Mo, 2.997mol%Nb, 60.697mol%Si, 6.003mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the nitrogen atmosphere environment, synthetic (Mo reacts 0.91Nb 0.09) (Si 0.91Al 0.09) 2
Embodiment 11. mixes the powder of molybdenum, niobium, silicon, aluminium according to 28.305mol%Mo, 4.995mol%Nb, 56.695mol%Si, 10.005mol%Al molar ratio, mixed powder is pressed into base substrate, base substrate is put into the combustion synthesis reaction device, light powder green bodies in the argon gas atmosphere environment, synthetic (Mo reacts 0.85Nb 0.15) (Si 0.85Al 0.15) 2

Claims (3)

1. a niobium and aluminium alloying molybdenum disilicide material, it is characterized in that: chemical expression is (Mo 1-xNb x) (Si 1-yAl y) 2, wherein X is within 0～0.15 the scope, and Y is within 0～0.15 the scope.
2. the described niobium of claim 1 and aluminium alloying molybdenum disilicide material preparation method is characterized in that processing step is as follows:
A. molybdenum, niobium, silicon, aluminium powder form are mixed according to the ratio of 28.305～33.3mol%Mo, 0～4.995mol%Nb, 56.695～66.7mol%Si, 0～10.005mol%Al;
B. will mix powder compression and become base substrate;
C. the mixed powder base substrate is put into combustion and synthesis device, in protective atmosphere, light the mixed powder base substrate, the synthetic niobium of chemical reaction and aluminium alloying molybdenum disilicide material occur.
3. method according to claim 2 is characterized in that, described protective atmosphere is argon gas, hydrogen or nitrogen atmosphere.
CN2013100353564A 2013-01-29 2013-01-29 Niobium-aluminum alloying molybdenum disilicide material and preparation method thereof Pending CN103060587A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109913684A (en) * 2019-03-19 2019-06-21 丽水学院 A method of quickly preparing Ti-Lu porous material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101555564A (en) * 2009-05-08 2009-10-14 中国矿业大学 Method for preparing Mo(Si1-xMgx)2 material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101555564A (en) * 2009-05-08 2009-10-14 中国矿业大学 Method for preparing Mo(Si1-xMgx)2 material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
T.DASGUPTA ET AL: "Improved ductility and oxidation resistance in Nb and Al co-substituted MoSi2", 《INTERMETALLICS》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109913684A (en) * 2019-03-19 2019-06-21 丽水学院 A method of quickly preparing Ti-Lu porous material
CN109913684B (en) * 2019-03-19 2021-03-23 丽水学院 Method for rapidly preparing titanium-aluminum porous material

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Application publication date: 20130424