CN104611583A - Composite modifier for improving wear resistance of complex aluminum-silicon alloy - Google Patents
Composite modifier for improving wear resistance of complex aluminum-silicon alloy Download PDFInfo
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- CN104611583A CN104611583A CN201310540125.9A CN201310540125A CN104611583A CN 104611583 A CN104611583 A CN 104611583A CN 201310540125 A CN201310540125 A CN 201310540125A CN 104611583 A CN104611583 A CN 104611583A
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Abstract
The invention discloses a composite modifier for improving the wear resistance of a complex aluminum-silicon alloy, and belongs to the technical field of aluminum-silicon alloys. The composite modifier comprises 9-11wt% of Sr, 4-6wt% of Ti, 2-4wt% of Na, 0.8-1.5wt% of B, and the balance of aluminum. The composite modifier is a block alloy, the melting point range of the composite modifier is 500-600DEG C, and the addition range of the composite modifier is 0.5-1.0wt%.
Description
Technical field
The invention belongs to aluminum silicon alloy technical field, refer in particular to a kind of compound modifier that can improve polybasic aluminum silicon alloy wear resistance.
Background technology
Automobile engine cylinder-body is as one of parts most important in engine, its quality account for car load heavy 18%, complex structure, inhomogeneity of wall thickness is even and thinnest part is only 3 ~ 5mm, and it is bad and do high speed relative movement under having solia particle and corrosive medium working condition in high temperature, high pressure and lubricating condition, inside parts produces very large mechanical stress and thermal stresses, bears strong frictional wear simultaneously.Therefore, require that cylinder body material has good over-all properties.
Current majority adopts aluminum silicon alloy to make automobile engine cylinder-body, will carry out Metamorphism treatment for aluminum silicon alloy to silicon.Sr is better to Eutectic Silicon in Al-Si Cast Alloys Metamorphism treatment effect, and rotten validity period is long, but its modification process is not easily grasped, and specific absorption is low, and latent period is long, and foundry goods easily occurs pin hole.About the rotten report to Al-Si series alloy, generally all to add rare earth, adopt composite inoculating together with sodium salt, Sr, Ti etc., but which increase production cost, extend manufacture cycle, and sodium salt can to environment.Adopt composite inoculating, namely Sr, Ti, B carry out compound modification treatment, can advantage that comprehensively multiple element is rotten, make up some shortcomings that a kind of element is rotten, reach the over-all properties of raising polybasic aluminum silicon alloy.The present invention develops a kind of compound modifier that can improve polybasic aluminum silicon alloy wear resistance.
Summary of the invention
A kind of compound modifier that can improve polybasic aluminum silicon alloy wear resistance, it is characterized by, Sr9-11wt%, Ti4-6 wt%, Na2-4 wt%, B0.8-1.5wt%, remaining is aluminium, described compound modifier is bulk alloy, melting range 500 ~ 600 DEG C, compound modifier add-on scope is 0.5 ~ 1.0wt%.
accompanying drawing explanation
The impact of Fig. 1 composite inoculating alloy wear weight loss
×--non-Metamorphism treatment, ▲--through compound modification treatment
Wear weight loss the results are shown in Figure 1, carry out wearing test to through compound modification treatment and untreated alloy, load is 100N, and rubbing to pair is 45 steel, be not difficult to draw by Fig. 1: the wear weight loss adding the cast aluminium alloy of alterant obviously reduces, composite inoculating improves the wear resisting property of alloy.Because alloy matrix aluminum is softer, Si phase particle plays a supportive role to softer aluminum substrate
,and composite inoculating changes form and the distribution situation of Si phase in collective, carrying in long wear process, the germinating of phase boundary place crackle and expansion cause the disengaging of Si phase and Si phase fragmentation under a large load itself comes off, cause the inefficacy of effectively carrying phase in alloy, the intense plastic strain of matrix may be caused, wear resistance decrease.In unmetamorphosed Al-Si alloy, Si phase size is comparatively large, and the polygonal pattern of sheet and agglomeration, these are all unfavorable for the overall available protecting to matrix.Therefore, the wear resisting property of alloy is not high.On the contrary, after composite inoculating, Si phase morphology changes and is uniformly distributed comparatively even, effectively can share load, hinder the viscous deformation of matrix, improve the wear resisting property of alloy.
embodiment
embodiment.
Polybasic aluminum silicon alloy composition is, Si6.5 ~ 7.5wt%, Cu3.5 ~ 4.5 wt%, Mn0.30 ~ 0.45wt%, Mg0.35 ~ 0.45wt%, Zn0.40 ~ 0.60wt%, Cr0.25 ~ 0.35wt%, Ni0.2 ~ 0.3wt%, remaining be Al.By A1-50wt%Cu, A1-28 wt %Si, A1-10 wt %Mn, master alloy and the pure Zn etc. such as Al-10 wt %Cr, Al-10 wt %Ni put into crucible for smelting stove and carry out melting, all change to stir gently after clear skimming and after being incubated 5min until alloy, be pressed into pure Mg again, and stir gently, allow Mg fully melt diffusion, insulation 10min(now aluminium alloy temperature is 740 ~ 760 DEG C).With bell jar by account for aluminium alloy weight 0.4 wt% degassing refining agent press-in aluminium alloy in carry out refinery by de-gassing, skimming after refinery by de-gassing after being cooled to 730 DEG C of standing 5min, add the 0.5 ~ 1.0wt% compound modifier accounting for aluminium alloy weight and carry out Metamorphism treatment, after leaving standstill 5min, temperature is 720 DEG C and pours into a mould, be poured in metal type dies, cast specimen size is Φ 50 mm X200 mm.The sample poured into a mould is got frictional wear sample, and frictional wear specimen size is 19.5 mm × 8, mm × 10 mm.
Frictional wear experiment carries out at M-2000 friction wear testing machine.During skimming wear, upper sample is fixed, the friction optional high speed 400r/min of hourly velocity or low speed 200r/min.Consider that polynary Al-Si alloy rigidity is lower, impact comparatively large, and be metal to-metal contact during high speed, this test and Selection low speed 200r/min, this tallies with the actual situation.To be extrusion spring by lever transmission give upper axle to experiment load and be applied to and be contained in friction on lower shaft to pair, friction is 45 steel to pair, the block sample of upper axle maintains static, and lower shaft is rotated pair by the driven by motor friction of bottom, carries out sliding frictional wear experiment.Wear test condition is the dry Sliding Friction Wear of carrying out under atmospheric environment, and experimental temperature is room temperature (20 ± 10) DEG C; Load is 100N, and sliding velocity is 200 r/min, and wearing-in period gets 10min, 20min, 30min, 40min.Friction and wear behavior is shown in Fig. 1.
comparative example
Polybasic aluminum silicon alloy composition is, Si6.5 ~ 7.5wt%, Cu3.5 ~ 4.5wt%, Mn0.30 ~ 0.45wt%, Mg0.35 ~ 0.45 wt%, Zn0.40 ~ 0.60wt%, Cr0.25 ~ 0.35wt%, Ni0.2 ~ 0.3wt%, remaining be Al.By A1-50wt%Cu, A1-28 wt %Si, A1-10 wt %Mn, master alloy and the pure Zn etc. such as Al-10 wt %Cr, Al-10 wt %Ni put into crucible for smelting stove and carry out melting, all change to stir gently after clear skimming and after being incubated 5min until alloy, be pressed into pure Mg again, and stir gently, allow Mg fully melt diffusion, insulation 10min(now aluminium alloy temperature is 740 ~ 760 DEG C).With bell jar by account for aluminium alloy weight 0.4 wt% degassing refining agent press-in aluminium alloy in carry out refinery by de-gassing, skimming after refinery by de-gassing after being cooled to 730 DEG C of standing 5min, temperature is 720 DEG C and pours into a mould, and is poured in metal type dies, and cast specimen size is Φ 50 mm X200 mm.The sample poured into a mould is got frictional wear sample, and frictional wear specimen size is 19.5 mm × 8, mm × 10 mm.
Frictional wear experiment carries out at M-2000 friction wear testing machine.During skimming wear, upper sample is fixed, the friction optional high speed 400r/min of hourly velocity or low speed 200r/min.Consider that polynary Al-Si alloy rigidity is lower, impact comparatively large, and be metal to-metal contact during high speed, this test and Selection low speed 200r/min, this tallies with the actual situation.To be extrusion spring by lever transmission give upper axle to experiment load and be applied to and be contained in friction on lower shaft to pair, friction is 45 steel to pair, the block sample of upper axle maintains static, and lower shaft is rotated pair by the driven by motor friction of bottom, carries out sliding frictional wear experiment.Wear test condition is the dry Sliding Friction Wear of carrying out under atmospheric environment, and experimental temperature is room temperature (20 ± 10) DEG C; Load is 100N, and sliding velocity is 200 r/min, and wearing-in period gets 10min, 20min, 30min, 40min.Friction and wear behavior is shown in Fig. 1.
Claims (2)
1. one kind can be improved the compound modifier of polybasic aluminum silicon alloy wear resistance, it is characterized by, Sr9-11wt%, Ti4-6 wt%, Na2-4 wt%, B0.8-1.5wt%, described compound modifier is bulk alloy, melting range 500 ~ 600 DEG C, compound modifier add-on scope is 0.5 ~ 1.0wt%.
2. a kind of compound modifier that can improve polybasic aluminum silicon alloy wear resistance according to claim 1, after polybasic aluminum silicon alloy adds the process of 0.5 ~ 1.0wt% compound modifier, wear resisting property improves 100%.
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| CN201310540125.9A CN104611583A (en) | 2013-11-05 | 2013-11-05 | Composite modifier for improving wear resistance of complex aluminum-silicon alloy |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4576791A (en) * | 1984-02-27 | 1986-03-18 | Anglo Blackwells Limited | Aluminium-strontium-titanium-boron master alloy |
| CN1145412A (en) * | 1995-09-15 | 1997-03-19 | 卞津良 | A, Sr, Ti, B medium alloy and its prodn. method |
| CN101591746A (en) * | 2009-03-26 | 2009-12-02 | 广州钢铁企业集团有限公司 | A kind of aluminium, aluminium alloy grain refinement and modification master alloy and preparation method thereof |
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2013
- 2013-11-05 CN CN201310540125.9A patent/CN104611583A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4576791A (en) * | 1984-02-27 | 1986-03-18 | Anglo Blackwells Limited | Aluminium-strontium-titanium-boron master alloy |
| CN1145412A (en) * | 1995-09-15 | 1997-03-19 | 卞津良 | A, Sr, Ti, B medium alloy and its prodn. method |
| CN101591746A (en) * | 2009-03-26 | 2009-12-02 | 广州钢铁企业集团有限公司 | A kind of aluminium, aluminium alloy grain refinement and modification master alloy and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 司乃潮等: "复合长效细化变质剂的试验研究", 《铸造技术》, no. 2, 31 December 1992 (1992-12-31), pages 42 * |
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Application publication date: 20150513 |