CN101818313A - Method for enhancing performance of magnesium-based composite material - Google Patents
Method for enhancing performance of magnesium-based composite material Download PDFInfo
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- CN101818313A CN101818313A CN200910117605A CN200910117605A CN101818313A CN 101818313 A CN101818313 A CN 101818313A CN 200910117605 A CN200910117605 A CN 200910117605A CN 200910117605 A CN200910117605 A CN 200910117605A CN 101818313 A CN101818313 A CN 101818313A
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Abstract
The invention discloses a method for enhancing the performance of a magnesium-based composite material, and aims to improve the comprehensive mechanical property of the magnesium-based composite material. The method comprises the following steps of: placing as-cast magnesium ingot in a cast-iron crucible which is pre-heated to 400 DEG C so as to pre-heat the as-cast magnesium ingot; scattering a covering agent special for a magnesium alloy on the surface of the as-cast magnesium ingot so as to prevent oxidation; after the magnesium ingot is completely melted when the temperature is raised to 710 DEG C, preserving the heat for about 5 minutes and removing the surface impurity; then placing the reinforced phase nickel-plated CNT and SiCp into the crucible and stirring the materials for 5 minutes; standing the materials for 1 minute after stirring; and when the furnace temperature is raised to 710 DEG C, removing the surface impurity, casting, solidifying and then stripping the mould.
Description
Technical field
The invention provides a kind of method that strengthens pure magnesium mechanical property, belong to the research field of magnesium base composite material.
Background technology
Magnesium base composite material as the lightest in the structured material, specific tenacity is the highest, the metal_based material that specific rigidity and aluminium alloy are suitable is subjected to the extensive concern of various countries.And magnesia structural part is having very big technical superiority than aluminium aspect mechanical workout, cyclic regeneration product and the casting, and available magnesium base composite material replaces special plastic.Application potential in emerging high-technology field is bigger than traditional metal materials.Therefore, magnesium base composite material has become one of the research focus in metal-base composites field.Magnesium base composite material aspect number of research projects was the needs at national defence and aerospace application in the past, and along with the researchdevelopment of novel manufacturing process, magnesium base composite material is used widely obtaining aspect space flight and aviation, automobile, nuclear industry and other the advanced engineering.
The tensile strength of pure magnesium, hardness are all very low, are unsuitable for the manufacturing structure material, and various countries are mainly single-phase enhancing to the enhancing of pure magnesium material now, and wild phase commonly used has Al
2O
3Staple fibre, carbon fiber, SiC whisker and particle, Ti fiber, B fiber etc., the magnesium base composite material that single-phase enhancing obtains, the purer magnesium of its mechanical property has good raising.Chinese patent CN1667149.2005-09-14 for example, copper-plated silicon carbide particle reinforced magnesium based compound material.But single-phase enhancing often can only make a certain or several mechanical properties of material be improved preferably, has limited its further application.
Summary of the invention
The objective of the invention is to improve the comprehensive mechanical property of magnesium base composite material.
The present invention is a kind of method that strengthens performance of magnesium-based composite material, the steps include:
(1) the as cast condition magnesium ingot is put into is preheating to 400 ℃ cast-iron pot, it is heated;
(2) rise to 710 ℃ when temperature, treat that magnesium ingot all after the fusing, sprinkles the special-purpose insulating covering agent of magnesium alloy on the surface;
(3) insulation is about 5 minutes, and surface impurity is removed, and CNT, the SiCp with wild phase nickel plating puts into crucible then, and stirs, and churning time is 5 minutes; The volume content of CNTs and SiCp is respectively 1.1% and 2%; CNTs and SiCp put into mortar and ground 20 minutes before adding;
(4) sprinkle insulating covering agent on the surface again after the stirring, left standstill 1 minute, make the oxide compound and the melt extraction that produce in the whipping process;
When (5) treating that furnace temperature rises to 710 ℃, remove surface impurity, cast, carry out molding after solidifying; Before the casting cleaning and exsiccant die surface are coated with the very thin ZnO of last layer, put preheating in another stove that has been heated to 300 ℃ then into.
Usefulness of the present invention is: the present invention is improved mechanical properties such as the intensity, consistency and elasticity modulus of magnesium base composite material.The tensile strength of matrix material, Young's modulus, hardness have improved 80%, 51.8%, 19.5% than pure magnesium respectively.Its major cause is:
(1) adding of nickel plating CNTs and the SiCp effect of crystal grain of having played refinement.Refined crystalline strengthening is improved the mechanical property of matrix material largely.
(2) add CNTs, SiCp in the matrix material after, very big (Mg:CTE=26 * 10 of thermal expansivity (CTE) difference of they and matrix
-6/ ℃, SiCp:CTE=4 * 10
-6/ ℃, CNTs:CTE ≈ 0), in the cooled and solidified process of matrix material, the shrinkage of wild phase and matrix is different, thereby produces highdensity dislocation near CNTs, SiCp, emits a series of dislocation loop, along with the increasing and become big of dislocation loop, the stress field of dislocation loop increases.After stress field increases to a certain degree, will hinder the slippage of dislocation, so produced dislocations strengthening, make the intensity of matrix increase.The acting in conjunction of dislocations strengthening is improved the mechanical property of matrix material largely.
(3) nickel plating CNTs has increased the consistency between CNTs and the magnesium matrix.
(4) CNTs has high tensile strength, the extreme hardness of SiCp, realizes having complementary advantages in metallic matrix, has played the effect of carrying plus load and stress transfer.
(5) put into mortar before CNTs and SiCp add and ground 20 minutes, improved the dispersiveness of CNTs in matrix.
Specific implementation method
The present invention is a kind of method that strengthens performance of magnesium-based composite material, the steps include:
(1) the as cast condition magnesium ingot is put into is preheating to 400 ℃ cast-iron pot, it is heated;
(2) rise to 710 ℃ when temperature, treat that magnesium ingot all after the fusing, sprinkles the special-purpose insulating covering agent of magnesium alloy, in case oxidation on the surface;
(3) insulation is about 5 minutes, and surface impurity is removed, and CNT, the SiCp with wild phase nickel plating puts into crucible then, and stirs, and churning time is 5 minutes; The volume content of CNTs and SiCp is respectively 1.1% and 2%; CNTs and SiCp put into mortar and ground 20 minutes before adding;
(4) sprinkle insulating covering agent on the surface again after the stirring, left standstill 1 minute, make the oxide compound and the melt extraction that produce in the whipping process;
When (5) treating that furnace temperature rises to 710 ℃, remove surface impurity, cast, carry out molding after solidifying; Before the casting cleaning and exsiccant die surface be coated with the cast ZnO of molding of very thin the helping of last layer, put preheating in another stove that has been heated to 300 ℃ then into.
Claims (2)
1. a method that strengthens performance of magnesium-based composite material the steps include:
(1) the as cast condition magnesium ingot is put into is preheating to 400 ℃ cast-iron pot, it is heated;
(2) rise to 710 ℃ when temperature, treat that magnesium ingot all after the fusing, sprinkles the special-purpose insulating covering agent of magnesium alloy on the surface;
(3) insulation is about 5 minutes, and surface impurity is removed, and CNT, the SiCp with wild phase nickel plating puts into crucible then, and stirs, and churning time is 5 minutes; The volume content of CNTs and SiCp is respectively 1.1% and 2%; CNTs and SiCp put into mortar and ground 20 minutes before adding;
(4) sprinkle insulating covering agent on the surface again after the stirring, left standstill 1 minute, make the oxide compound and the melt extraction that produce in the whipping process;
When (5) treating that furnace temperature rises to 710 ℃, remove surface impurity, cast, carry out molding after solidifying; Before the casting cleaning and exsiccant die surface are coated with the very thin ZnO of last layer, put preheating in another stove that has been heated to 300 ℃ then into.
2. the method for enhancing performance of magnesium-based composite material according to claim 1 is characterized in that the CNTs diameter is 20～40nm, and the particle diameter of SiCp is 2 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101176058A CN101818313B (en) | 2009-11-16 | 2009-11-16 | Method for enhancing performance of magnesium-based composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101176058A CN101818313B (en) | 2009-11-16 | 2009-11-16 | Method for enhancing performance of magnesium-based composite material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101818313A true CN101818313A (en) | 2010-09-01 |
| CN101818313B CN101818313B (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101176058A Expired - Fee Related CN101818313B (en) | 2009-11-16 | 2009-11-16 | Method for enhancing performance of magnesium-based composite material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191443A (en) * | 2011-05-16 | 2011-09-21 | 西安理工大学 | Preparation method of alumina fiber reinforced magnesium-matrix composite |
| CN109518049A (en) * | 2018-10-31 | 2019-03-26 | 江苏理工学院 | A kind of nickel-plating carbon nanotube enhancing Mg Li composites and preparation method thereof |
-
2009
- 2009-11-16 CN CN2009101176058A patent/CN101818313B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191443A (en) * | 2011-05-16 | 2011-09-21 | 西安理工大学 | Preparation method of alumina fiber reinforced magnesium-matrix composite |
| CN102191443B (en) * | 2011-05-16 | 2013-05-08 | 西安理工大学 | Preparation method of alumina fiber reinforced magnesium-matrix composite |
| CN109518049A (en) * | 2018-10-31 | 2019-03-26 | 江苏理工学院 | A kind of nickel-plating carbon nanotube enhancing Mg Li composites and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN101818313B (en) | 2012-02-01 |
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Granted publication date: 20120201 Termination date: 20131116 |