CN1693499A - Preparation method of high melting point gradient composite material - Google Patents
Preparation method of high melting point gradient composite material Download PDFInfo
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- CN1693499A CN1693499A CN 200510012369 CN200510012369A CN1693499A CN 1693499 A CN1693499 A CN 1693499A CN 200510012369 CN200510012369 CN 200510012369 CN 200510012369 A CN200510012369 A CN 200510012369A CN 1693499 A CN1693499 A CN 1693499A
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Abstract
A process for preparing the high-smelting-point gradient composition includes such steps as mechanically mixing and grinding the high-smelting-point raw powder to become alloyed state, mixing it with other powdered raw materials, die pressing, putting it in graphite mould, filling Ar gas or vacuumizing, electric arc igniting, and self-holding combustion.
Description
Technical field
The preparation method of the high-melting-point anti scuffing gradient composites that patent of the present invention proposes belongs to the Composite Preparation technical field, specially refers to the preparation method of the high-melting-point matrix material that is applied to extreme condition.
Technical background
The self-propagating high-temperature combustion synthesis technology (SHS) that developed recently gets up has fast and energy-saving advantages, is applicable to the preparation of the alloy material and the matrix material of component complexity.But since the restriction of material system reaction adiabatic temperature, the self-sustaining burning difficulty of some materials with high melting point, yield rate is low, and complex process has been limited to the type and the formulating of recipe that are equipped with the high-melting-point matrix material with the SHS legal system.
Summary of the invention
Its purpose of preparation method of high-melting-point anti scuffing gradient composites of the present invention is, overcome the deficiency of above-mentioned background technology, propose the method that a kind of new efficient, economic mechanical alloying and the auxiliary self-propagating high-temperature burning synthesis for preparing of pulsed electrical field are equipped with high-melting-point anti scuffing gradient composites.
The preparation method of a kind of high melting point gradient composite material of the present invention is characterized in that, adopts mechanical alloying and the auxiliary self-propagating combustion synthesis and preparation process of pulsed electrical field method, and this method comprises:
Two or more different metal powder or non-metal powder mechanically mixing are also ground; Be pressed into blank according to the powder behind the material component ratio that will prepare and other metal or the nonmetal starting material powder uniform mixing; Blank is placed between the Graphite Electrodes, and add the pulsed voltage of 20～50v, pulse-repetition 5～30HZ; With ignite blank and form self-sustaining burning reaction of electric arc; Adopt the Ar gas shiled in the roasting kiln or be lower than 10
-2The vacuum protection of Pa; Above-mentioned two or more different metal powder or non-metal powder are nickel powder, molybdenum powder, iron powder, titanium valve, Graphite Powder 99, SiO
2Powder, TiO
2Powder, granularity are 0.1～0.5 μ m, nickel powder or aluminium powder or iron powder 10～20%, titanium valve 10～35%, Graphite Powder 99 10～20%, SiO
2Powder+TiO
2Powder 10～25%; Ground again after the mechanically mixing 5～10 hours; Will through the powder after grinding again with other raw material powder aluminium powder, titanium valve, nickel powder, Fe
2O
3Powder, TiO
2Powder, CrO powder, ZrO
2Powder, a powder degree are 5.0～15 μ m, uniform mixing, wherein, aluminium powder 30～40%, titanium valve 5～10%, nickel powder 5～20%, Fe
2O
3+ TiO
2+ CrO+ZrO
2Powder 20～30%, the powder through grinding accounts for 10～50%.
The preparation method of above-mentioned a kind of high-melting-point anti scuffing gradient composites is characterized in that the powder behind the described uniform mixing is pressed into blank, and the pressure when blank prepares is 50～100MPa, and the density of blank is 30～80%.
The preparation method of above-mentioned a kind of high-melting-point anti scuffing gradient composites, electric current is 800～2000A when it is characterized in that described auto-combustion reaction.
As shown in the figure, the test specimen blank 1 that suppresses is placed between the Graphite Electrodes 2,3, add pulsed voltage 20～50V between electrode, pulse-repetition is 5～100HZ; Electric current is 500～2000A during combustion reactions; Adopting Ar gas shiled or vacuum tightness in the graphite jig 4 is the rough vacuum of 10-2Pa; Adopt electric arc pilot burner 5 to light blank 1, simultaneously by the pressurization of 7 pairs of burnings of pressure head blank.After combustion reactions finishes, pressure is retained to from Reaktionsofen, takes out test specimen after the test specimen temperature is lower than 100 ℃.
Present method is mainly used in preparation and has hot strength and matrix material wear-resistant, etch resistant properties.
Description of drawings
Fig. 1 is a self-propagating high-temperature combustion unit synoptic diagram, and number in the figure is respectively: 1-test specimen blank, 2, the 3-Graphite Electrodes, 4-graphite jig, 5-electric arc pilot burner, the 6-pulse power, 7-pressure head, 8-Reaktionsofen, 9-vacuum or gas protection system, 10-insulated thermal insulating layer.
The principle of mechanical alloying and the design of pulsed electrical field aid burning among following surface analysis explanation the present invention.In the preparation method, the mixing of starting material micro mist and process of lapping, generating material refinement and alloying phenomenon improve the surface energy of particulate and volume energy, and combination reaction can reduce, and helps the thermopositive reaction with reaction system of igniting of blank.The pulse of frequency adjustable, voltage not only produce the resistance heat of system, and can effectively control the energy and the velocity of wave of combustion wave, form the interrupted oscillation phenomenon of reaction process, have improved reaction efficiency and synthetic quality.The self-propagating combustion reaction of this controlled heat helps the synthetic of high-melting-point multi-component material, compares with material synthesis method in the past, and is not only quick, energy-conservation, but and crystal grain thinning and raising density.Especially for the high-melting-point reaction system of adiabatic temperature greater than 2000K, owing in the system can the raising and the raising of real reaction heat be easy to blank and light and form self-sustaining burning, promoted atom, the ion diffusion speed of heterogeneous powder interface and phase interface, formed even matter and meticulous composite structure thereby help layer, interface and homogenizing.
Embodiment
Embodiment 1.
Titanium valve 35%, iron powder 10%, nickel powder 10%, Graphite Powder 99 20%, SiO
2+ TiO
2Powder 25%, granularity are 0.2 μ m, grind behind the uniform mixing to form the alloying powder mix in 10 hours.Alloying powder mix with 30% and 70% granularity are 20% nickel powder of 15 μ m, aluminium powder 40%, Fe
2O
3+ TiO
2Powder 40% is pressed into the blank of 20mm * 20mm * 2mm with 60MPa pressure behind the uniform mixing.With blank as between the electrode in the roasting kiln, making alive 30V, frequency 25Hz, electric current 600A, Ar gas shiled; Form self-sustaining burning with the electric arc blank that ignites.Burning finishes to add 80MPa pressure in back 5 seconds, takes out after test specimen is cooled to 100 ℃.Minimum grain fineness number 0.2 μ m, surperficial average hardness is HRC81.
Embodiment 2.
Titanium valve 35%, aluminium powder 15%, nickel powder 20%, Graphite Powder 99 20%, SiO
2+ TiO
2Powder 10%, granularity are 0.3 μ m, grind behind the uniform mixing to form the alloying powder mix in 5 hours; Get TiO
2Powder 30%, aluminium powder 30%, CrO+ZrO
2Powder 40%, granularity are 10 μ m, form second kind of powder mix behind the uniform mixing; Alloying powder mix with 30% and second kind of powder mix uniform mixing of 70% are pressed into the blank of 20mm * 20mm * 2mm with 80Mpa pressure.Blank is placed between the electrode in the roasting kiln making alive 25V, frequency 45Hz, electric current 800A, Ar gas shiled; Form self-sustaining burning with the electric arc blank that ignites.Burning finishes to add 80MPa pressure in back 5 seconds, takes out after test specimen is cooled to 100 ℃, and surperficial average hardness is HRC61.
Embodiment 3.
Titanium valve 30%, iron powder 30%, nickel powder 20%, SiO
2+ TiO
2Powder 20%, granularity are 0.5 μ m, grind behind the uniform mixing to form the alloying powder mix in 7 hours; Get aluminium powder 35%, Fe
2O
3+ TiO
2Powder 40%, nickel powder 20%, titanium valve 5%, granularity is 15 μ m, forms second kind of powder mix behind the uniform mixing; Alloying powder mix with 20% and second kind of powder mix uniform mixing of 80% are pressed into the blank of 30mm * 30mm * 5mm with 100MPa pressure.Blank is placed between the electrode in the roasting kiln making alive 20V, frequency 5Hz, electric current 400A, vacuum tightness 1.3 * 10
-2The Pa protection; Form self-sustaining burning with the electric arc blank that ignites.Burning finishes to add 50MPa pressure in back 5 seconds, after being cooled to 100 ℃, takes out by test specimen, and minimum grain fineness number 0.4 μ m, surperficial average hardness is HRC85.
Claims (3)
1. the preparation method of a high melting point gradient composite material is characterized in that, adopts mechanical alloying and the auxiliary self-propagating combustion synthesis and preparation process of pulsed electrical field method, and this method comprises:
Two or more different metal powder or non-metal powder mechanically mixing are also ground; Be pressed into blank according to the powder behind the material component ratio that will prepare and other metal or the nonmetal starting material powder uniform mixing; Blank is placed between the Graphite Electrodes, and add the pulsed voltage of 20～50v, pulse-repetition 5～30HZ; With ignite blank and form self-sustaining burning reaction of electric arc; Adopt the Ar gas shiled in the roasting kiln or be lower than 10
-2The vacuum protection of Pa; Above-mentioned two or more different metal powder or non-metal powder are nickel powder, molybdenum powder, iron powder, titanium valve, Graphite Powder 99, SiO
2Powder, TiO
2Powder, granularity are 0.1～0.5 μ m, nickel powder or aluminium powder or iron powder 10～20%, titanium valve 10～35%, Graphite Powder 99 10～20%, SiO
2Powder+TiO
2Powder 10～25%; Ground again after the mechanically mixing 5～10 hours; Will through the powder after grinding again with other raw material powder aluminium powder, titanium valve, nickel powder, Fe
2O
3Powder, TiO
2Powder, CrO powder, ZrO
2Powder, a powder degree are 5.0～15 μ m, uniform mixing, wherein, aluminium powder 30～40%, titanium valve 5～10%, nickel powder 5～20%, Fe
2O
3+ TiO
2+ CrO+ZrO
2Powder 20～30%, the powder through grinding accounts for 10～50%.
2. the preparation method of a kind of high-melting-point anti scuffing gradient composites according to claim 1 is characterized in that the powder behind the described uniform mixing is pressed into blank, and the pressure when blank prepares is 50～100MPa, and the density of blank is 30～80%.
3. the preparation method of a kind of high-melting-point anti scuffing gradient composites according to claim 1, electric current is 800～2000A when it is characterized in that described auto-combustion reaction.
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|---|---|---|---|
| CN 200510012369 CN1693499A (en) | 2005-02-24 | 2005-02-24 | Preparation method of high melting point gradient composite material |
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|---|---|---|---|
| CN 200510012369 CN1693499A (en) | 2005-02-24 | 2005-02-24 | Preparation method of high melting point gradient composite material |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101797764B (en) * | 2009-12-29 | 2012-02-15 | 太原重工股份有限公司 | Baffle device used in extrusion molding of graphite electrode |
| CN101775517B (en) * | 2009-09-18 | 2012-07-18 | 江阴东大新材料研究院 | Method for preparing TiC/Al2O3/Fe composite ceramic matrix composite material |
| CN105478777A (en) * | 2015-12-14 | 2016-04-13 | 中国航空工业集团公司北京航空制造工程研究所 | Metal/ceramic gradient material and preparation method thereof |
| CN106435568A (en) * | 2016-10-18 | 2017-02-22 | 东北大学 | Mo-Ni-ZrN2 gradient coating layer and laser direct deposition preparation method |
| CN115608991A (en) * | 2022-12-14 | 2023-01-17 | 太原理工大学 | Large-scale double-metal shell ring flexible composite equipment and method thereof |
-
2005
- 2005-02-24 CN CN 200510012369 patent/CN1693499A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775517B (en) * | 2009-09-18 | 2012-07-18 | 江阴东大新材料研究院 | Method for preparing TiC/Al2O3/Fe composite ceramic matrix composite material |
| CN101797764B (en) * | 2009-12-29 | 2012-02-15 | 太原重工股份有限公司 | Baffle device used in extrusion molding of graphite electrode |
| CN105478777A (en) * | 2015-12-14 | 2016-04-13 | 中国航空工业集团公司北京航空制造工程研究所 | Metal/ceramic gradient material and preparation method thereof |
| CN106435568A (en) * | 2016-10-18 | 2017-02-22 | 东北大学 | Mo-Ni-ZrN2 gradient coating layer and laser direct deposition preparation method |
| CN115608991A (en) * | 2022-12-14 | 2023-01-17 | 太原理工大学 | Large-scale double-metal shell ring flexible composite equipment and method thereof |
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