CN101086045A - Transitional alloy layer for bearing alloy casting and its preparation method - Google Patents
Transitional alloy layer for bearing alloy casting and its preparation method Download PDFInfo
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- CN101086045A CN101086045A CN 200710070113 CN200710070113A CN101086045A CN 101086045 A CN101086045 A CN 101086045A CN 200710070113 CN200710070113 CN 200710070113 CN 200710070113 A CN200710070113 A CN 200710070113A CN 101086045 A CN101086045 A CN 101086045A
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- yttrium
- alloy layer
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Abstract
The invention discloses a transition alloy layer for bearing alloy casting and the preparation method. The transition alloy layer comprises silver, yttrium and stannum, the weight proportion of said metals is as follows: silver: 1%-5%; yttrium: 1%-3%; stannum: the rest. Said method comprises following steps: putting silver into crucible by a certain mass ratio, heating to 900 Deg. C for silver fusion, adding yttrium and stannum according to mass ratio, stirring and stewing for 25-35min when all metals are fused, then casting to produce alloy ingot. The invention is characterized in that the silver and yttrium are added into pure tin, and the water affinity of transition alloy layer to carbon steel and the layer strength are both improved. During the lab stage, the average bonding strength of bearing alloy and carbon steel exceeds 66MPa, and is over 55MPa prepared in large- scale production.
Description
Technical field
The present invention relates to a kind of transition alloy layer when being used for bearing alloy casting and preparation method thereof.
Background technology
Tinbase and graphite metal are low melting point alloys, are a kind of excellent propertys, last longly, use the widest bearing metal.Tinbase and graphite metal are mainly used to make the bearing shell of motor car engine and large and middle size motor, generator at home, account for the bearing shell sum more than 85%, such as the disclosed a kind of tinhase bearing metals of Chinese patent CN1880493, this alloy is that 5.5%～6.5% copper, weight percent are that 10%～13% antimony, weight percent are that 0.3%～0.8% zinc and tin are formed by weight percent, can also add 0.05%～0.2% silver in the composition.Tinbase and the graphite metal quality is soft, intensity is low is not suitable for making solid bearing, but they is cast on soft steel (the being box hat) surface, as bi-metal shaft bushing material.
But physics and chemical reaction do not take place in tinbase and graphite metal and soft steel, and two immiscible, and wettability is poor, so the bonding strength of tinbase and graphite metal and soft steel is relatively poor.Be difficult to direct pouring on box hat, must could be combined in above the box hat securely by transition layer.Generally be by box hat being immersed in the pure tin liquation (tin and iron generate the iron tin compound when 300 ℃ of left and right sides easily) in the prior art, utilize tin that carbon steel and bearing metal are all had wettability preferably, particularly tin and bearing metal can be molten altogether, with the pure tin be transition layer with bearing alloy casting on the carbon steel surface.
The size of bearing metal and box hat bonding force can directly have influence on the use properties and the work-ing life of bearing.The bearing of casting by the method for above-mentioned plating pure tin transition layer in the prior art, the tensile strength of pure tin is 15～20Mpa, the average bonding strength of molten rear bearing alloy and box hat is generally 45Mpa altogether.(GB/T 12948 sliding surface bearing bimetals are in conjunction with the strength failure test method) found in the test bonding strength test of reality, and the rupture failure place all is at transition layer, and the tensile strength of transition layer has had a strong impact on the bonding strength of bearing metal and carbon steel.
Summary of the invention
The object of the present invention is to provide a kind of transition alloy layer when being used for bearing alloy casting and preparation method thereof, described transition alloy layer and preparation method thereof can solve in the above-mentioned prior art the lower technical problem of average bonding strength of molten rear bearing alloy and box hat altogether.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: described transition alloy layer includes silver, yttrium and tin, and the weight percent of the silver in the described transition alloy layer, yttrium and tin is respectively:
Silver: 1%～5%;
Yttrium: 1%～3%;
Tin: surplus.
The present invention also aims to provide a kind of method for preparing above-mentioned transition alloy layer when being used for bearing alloy casting, described method is: earlier silver is put into crucible according to the quality proportioning, be heated to and make the silver fusing about 900 ℃, add yttrium and tin respectively by quality proportioning mark then, after treating that whole melting of metal are finished, stirring was left standstill 25～35 minutes, was cast into alloy pig then.
Adopt technique scheme, the present invention has positive obvious effects.Among the present invention, added silver and yttrium, improved the wettability of transition alloy layer on the one hand, improved the intensity of transition alloy layer self on the other hand carbon steel in the pure tin the inside.At laboratory stage, as transition alloy layer, make the average bonding strength of bearing metal and carbon steel surpass 66MPa, and bonding strength also all surpass 55MPa in producing bearing in enormous quantities with the present invention.
Embodiment
Below by embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1: earlier the silver of 100g is put into crucible, is heated to and makes it fusing about 900 ℃, add 100g yttrium and 9800g tin then, treat that whole melting of metal finish after, stir, left standstill 30 minutes, be cast into alloy pig then.
Embodiment 2: earlier the silver of 250g is put into crucible, is heated to and makes it fusing about 900 ℃, add 150g yttrium and 9600g tin then, treat that whole melting of metal finish after, stir, left standstill 30 minutes, be cast into alloy pig then.
Embodiment 3: earlier the silver of 500g is put into crucible, is heated to and makes it fusing about 900 ℃, add 300g yttrium and 9200g tin then, treat that whole melting of metal finish after, stir, left standstill 30 minutes, be cast into alloy pig then.
The salient features of each material contrasts referring to following table:
| Material mark | Bearing metal ZSnSb11Cu6 | Pure tin (Sn) | Tin alloy of the present invention | Soft steel (20#) |
| Tensile strength (MPa) | 88 | 15～20 | 90 | 410 |
| Fusing point (℃) | 370 | 232 | 250 | 1500 |
Technical scheme preferred embodiment 2 of the present invention should add the scaling loss amount of each metal when calculating each composition.Need the box hat surface is cleaned before zinc-plated, general cleaning process is as follows: 1) degreasing: can use trieline, zellon kind solvent, also can use degreasings such as alkali lye such as sodium hydroxide solution; 2) pickling: can carry out pickling with hydrochloric acid or sulphuric acid soln; 3) brush solvent: be coated with one deck solvent on carbon element box hat surface before zinc-plated, be generally the zinc chloride saturated solvent, so that eliminate the oxide film that the box hat surface forms again after cleaning.Can use immersed method and streak method when zinc-plated.Immersionization is with after the tin alloy heat fused, and the carbon element box hat is immersed the tin alloy liquation, and through after the certain hour box hat being taken out, the box hat surface just is coated with one deck tin alloy, i.e. transition alloy layer.Streak method is that box hat is heated to certain temperature, generally surpasses 50～100 ℃ of tin alloy fusing points, then tin alloy is spread upon the box hat surface uniformly, and one deck tin alloy, i.e. transition alloy layer will be adhered in the box hat surface.Integral metal immediately during zinc-plated finishing.
At last, should be pointed out that above embodiment only is the more representational example of the present invention.Obviously, technical scheme of the present invention is not limited to the foregoing description, and many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (2)
1. transition alloy layer when being used for bearing alloy casting, it is characterized in that: described transition alloy layer includes silver, antimony and tin, and the weight percent of the silver in the described transition alloy layer, antimony and tin is respectively:
Silver: 1%～5%;
Yttrium: 1%～3%;
Tin: surplus.
2. method for preparing the transition alloy layer when being used for bearing alloy casting as claimed in claim 1, it is characterized in that: earlier silver is put into crucible according to the quality proportioning, be heated to and make the silver fusing about 900 ℃, add yttrium and tin respectively by quality proportioning mark then, after treating that whole melting of metal are finished, stirring was left standstill 25～35 minutes, was cast into alloy pig then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100701139A CN100562593C (en) | 2007-07-20 | 2007-07-20 | A kind of transition alloy layer when being used for bearing alloy casting and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100701139A CN100562593C (en) | 2007-07-20 | 2007-07-20 | A kind of transition alloy layer when being used for bearing alloy casting and preparation method thereof |
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| CN101086045A true CN101086045A (en) | 2007-12-12 |
| CN100562593C CN100562593C (en) | 2009-11-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107824767A (en) * | 2017-10-30 | 2018-03-23 | 太湖县爱杰机械铸造有限公司 | Babbit metal bearing casting process |
| CN110699625A (en) * | 2019-10-18 | 2020-01-17 | 郑州机械研究所有限公司 | Steel-based bearing bush surface impregnation brazing coating and diffusion strengthening method |
-
2007
- 2007-07-20 CN CNB2007100701139A patent/CN100562593C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107824767A (en) * | 2017-10-30 | 2018-03-23 | 太湖县爱杰机械铸造有限公司 | Babbit metal bearing casting process |
| CN110699625A (en) * | 2019-10-18 | 2020-01-17 | 郑州机械研究所有限公司 | Steel-based bearing bush surface impregnation brazing coating and diffusion strengthening method |
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| Publication number | Publication date |
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| CN100562593C (en) | 2009-11-25 |
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Effective date of registration: 20071221 Address after: Zhejiang city of Zhuji Province Wang Yun Road No. 132 Applicant after: Zhejiang Tymoshenko Sliding Bearing Co., Ltd. Address before: Zhejiang city of Zhuji Province Wang Yun Road No. 132 Applicant before: He Quanbo |
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