CN102994803B

CN102994803B - Bearing alloy material with high softening-point temperature

Info

Publication number: CN102994803B
Application number: CN201210548702.4A
Authority: CN
Inventors: 赵光良
Original assignee: ZHEJIANG ZHUJI SHENFA BUSH CO Ltd
Current assignee: Zhejiang shenfa Bush Limited by Share Ltd
Priority date: 2012-12-17
Filing date: 2012-12-17
Publication date: 2014-02-12
Anticipated expiration: 2032-12-17
Also published as: CN102994803A

Abstract

The invention discloses a bearing alloy material with high softening-point temperature. The bearing alloy material comprises the following components in percentage by weight: 73-75% of Sn, 14.4-15.9% of Sb, 8.7-9.9% of Cu, 0.1-0.3% of Zn, 0.2-0.35% of Ag, 0.02-0.09% of Ni, 0.05-0.09% of Mn, 0.06-0.10% of As, 0.05-0.1% of Si, 0.4-0.7% of Cd, 0.01-0.02% of Fe, 0.1-0.3% of Al, 0.1-0.3% of V and 0.01-0.02% of rare earth. According to the invention, elements such as Mn, Si, V and rare earth are added to improve the melting point of babbitt metal, so that an alloy eutectic layer is stabilized and solidified, the mechanical strength of the babbitt metal is improved, the critical softening point of the alloy is improved, the temperature rise of cooling oil can be inhibited effectively, the hardness of the babbitt metal is improved, and the alloy layer is effectively prevented from burning under a semi-dry friction working condition in a starting stage of a machine set.

Description

A kind of bearing alloy material of high softening-point temperature

[technical field]

The present invention relates to the bearing alloy material for high softening-point temperature.

[technical background]

The application of nuclear power generation is more and more extensive, a plurality of Nuclear power plants are also had in China at present, the operation of the nuclear power generating sets of Nuclear power plants is most important to generating, the material of nuclear power generating sets will meet the characteristics such as fusing point, physical strength, thermotolerance and hardness of material that higher requirement could meet the normal operation, particularly nuclear power generating sets of unit the operation tool of unit is had a great impact.

At present, the critical softening temperature of the alloy of 1000MW ultra supercritical unit is at 112 ℃, alloy softening temperature is exactly that alloy has lost due hardness when reaching this temperature, that is to say arrive this temperature after hardness value sharply decline, cannot carry the temperature of the normal operation of unit.

[summary of the invention]

Object of the present invention is exactly in order to solve problems of the prior art, a kind of bearing alloy material of high softening-point temperature is proposed, can improve fusing point, physical strength and critical softening temperature, guarantee the normal operation of nuclear power generating sets, and extend the work-ing life of nuclear power generating sets.

For achieving the above object, patent of the present invention has proposed a kind of bearing alloy material of high softening-point temperature, it is characterized in that: comprise that following component and each constituent mass per-cent are: Sn:73 ~ 75%, Sb:14.4 ~ 15.9%, Cu:8.7 ~ 9.9%, Zn:0.1 ~ 0.3%, Ag:0.2 ~ 0.35%, Ni:0.02 ~ 0.09%, Mn:0.05 ~ 0.09%, As:0.06 ~ 0.10%, Si:0.05 ~ 0.1%, Cd:0.4 ~ 0.7%, Fe:0.01 ~ 0.02%, Al:0.1 ~ 0.3%, V:0.1 ~ 0.3%, rare earth: 0.01 ~ 0.02.

As preferably, each constituent mass per-cent is: Sn:74%, Sb:15%, Cu:9.405%, Zn:0.15%, Ag:0.8%, Ni:0.06%, Mn:0.07%, As:0.08%, Si:0.075%, Cd:0.55%, Fe:0.015%, Al:0.15%, V:0.15%, rare earth: 0.015%.

As preferably, each constituent mass per-cent is: Sn:73%, Sb:15.7%, Cu:9.2%, Zn:0.1%, Ag:0.2%, Ni:0.02%, Mn:0.05%, As:0.06%, Si:0.05%, Cd:0.4%, Fe:0.01%, Al:0.1%, V:0.1%, rare earth: 0.01.

As preferably, each constituent mass per-cent is: Sn:73.3%, Sb:14.43%, Cu:9.9%, Zn:0.3%, Ag:0.35%, Ni:0.09%, Mn:0.09%, As:0.10%, Si:0.1%, Cd:0.7%, Fe:0.02%, Al:0.3%, V:0.3%, rare earth: 0.02.

The present invention has added the elements such as Mn, Si, V, rare earth, its beneficial effect is: the fusing point that has improved Babbitt metal, make alloy Eutectic Layer be stablized and solidify, improved the physical strength of Babbitt metal, improved the critical softening temperature of alloy, can effectively suppress the temperature rise of cooling oil, improve the hardness of Babbitt metal, at the start-up period of unit, effectively avoid tile kilning under the operating mode of alloy layer at semi-dry friction.Material of the present invention can be widely used in nuclear power generating sets, can guarantee the normal operation of nuclear power generating sets, and extends the work-ing life of nuclear power generating sets.

[embodiment]

The bearing alloy material of the high softening-point temperature that patent of the present invention has proposed, comprises that following component and each constituent mass per-cent are: Sn:73 ~ 75%, Sb:14.4 ~ 15.9%, Cu:8.7 ~ 9.9%, Zn:0.1 ~ 0.3%, Ag:0.2 ~ 0.35%, Ni:0.02 ~ 0.09%, Mn:0.05 ~ 0.09%, As:0.06 ~ 0.10%, Si:0.05 ~ 0.1%, Cd:0.4 ~ 0.7%, Fe:0.01 ~ 0.02%, Al:0.1 ~ 0.3%, V:0.1 ~ 0.3%, rare earth: 0.01 ~ 0.02.

Embodiment mono-:

The bearing alloy material of high softening-point temperature, comprises that following component and each constituent mass per-cent are: Sn:74%, Sb:15%, Cu:9.405%, Zn:0.15%, Ag:0.8%, Ni:0.06%, Mn:0.07%, As:0.08%, Si:0.075%, Cd:0.55%, Fe:0.015%, Al:0.15%, V:0.15%, rare earth: 0.015%.

This formula is tried out on the 1000MW of Shanghai Turbine Co., Ltd nuclear power generating sets bearing, respond well.

In alloy ingredient, added Ag, silver can be carried heavy alloyed fusing point significantly, select suitable melting temperature, while making to take Babbitt metal that tin (Sn) is base mateiral to be heated to applicable eutectic temperature, silver element is penetrated in tin-based alloy layer, make babbitt layer composition changed and improve the fusing point of alloy, make alloy Eutectic Layer be stablized and solidify.In alloy ingredient, add silver (Ag), silver (Ag) improves the fusing point of alloy, but same silver add the corresponding change of temperature while making melted alloy, owing to having low melting point element in other compositions in Babbitt metal, the raising of temperature also makes the composition of these elements obtain scaling loss, ε phase and β phase in Babbitt metal metallographic structure have been destroyed, make microstructure of the alloy occur serious segregation, lose bearing shell Babbitt metal surface by forming oil lamella, and reached the effect that there is rigidity laminar flow carrying rotor and support its running.

In alloy ingredient, added nickel (Ni), the description of metallic nickel (Ni) element: hard and pliable and tough silvery white metal adds nickel, can improve the physical strength of Babbitt metal.Take steel as example, while being increased to 7.04% as nickel content in steel from 2.94%, just tensile strength is by 52.2Kg/mm ²be increased to 72.8Kg/mm ².Nickel add also can so that the supporting capacity of sliding surface bearing, withstand shocks and back and forth the ability of load obtain highly larger.Add nickel, can improve the physical strength of Babbitt metal, but the control of same maximum adding quantity is most critical, it is the material of high-melting-point and tool magnetic, must strict control its high-content, because as the direct surface of transfer contact, its high magnetic flux has strict demand, the second its fusing point is relatively high, and excessive element can extend the melted alloy time, simultaneously also can other elementary compositions of scaling loss.

Improved the content of Sb, antimony is electricity and hot poor conductor, not oxidizable at normal temperatures, there is corrosion resistance, so increase antimony, can carry heavy alloyed critical softening temperature so that the thermotolerance of bearing is improved, the temperature rise of the cooling oil of the bearing oil rete that effectively suppresses to flow through.Meanwhile, the Main Function of antimony in alloy is to increase hardness, is often called as the stiffening agent of metal or alloy.After the antimony that additional proportion does not wait in metal, the hardness of metal will strengthen, and can effectively avoid tile kilning under the operating mode of alloy layer at semi-dry friction at the start-up period of unit like this.

In addition, the present invention has also added V(vanadium in alloy compositions) and rare earth,

Vanadium has the title of metal " VITAMIN ", and adding of vanadium, has improved the resistance toheat of alloy.

Adding of rare earth element, improved elasticity, toughness and the intensity of alloyed metal, resistance toheat is also improved simultaneously.

The pouring temperature of this kind of alloy is at 520 ℃, critical softening temperature has reached 195 ℃, and the critical softening temperature of the Babbitt metal of domestic common generating set, ultra supercritical power generation unit and 1000MW nuclear power generating sets bearing at present used is at 112 ℃, alloy softening temperature is exactly that alloy has lost due hardness when reaching this temperature, after that is to say this temperature of arrival, hardness value sharply declines, and cannot carry the temperature of the normal operation of unit.

The test of alloy softening temperature: make what a bearing casting test specimen with rotational casting, cut four of 50mm * 50mm * 50mm alloy blocks, heating during since 70 ℃ in the consistent cabinet-type electric furnace of temperature uniformity, in the time of below 100 ℃, 5 ℃ of intervals of every intensification are taken out and are tested its surface hardness with Brinell tester for 10 minutes, when being greater than 100 ℃, 2 ℃ of intervals of every intensification are taken out and are tested its surface hardness with Brinell tester for 10 minutes, take four as one group, hardness when hardness is with room temperature after heating is compared while sharply declining, when HB decline is greater than 5, generally just think that softening temperature occurs in this temperature.

Embodiment bis-:

The bearing alloy material of high softening-point temperature, comprises that following component and each constituent mass per-cent are: Sn:73%, Sb:15.7%, Cu:9.2%, Zn:0.1%, Ag:0.2%, Ni:0.02%, Mn:0.05%, As:0.06%, Si:0.05%, Cd:0.4%, Fe:0.01%, Al:0.1%, V:0.1%, rare earth: 0.01.

Embodiment tri-:

The bearing alloy material of high softening-point temperature, comprises that following component and each constituent mass per-cent are: Sn:73.3%, Sb:14.43%, Cu:9.9%, Zn:0.3%, Ag:0.35%, Ni:0.09%, Mn:0.09%, As:0.10%, Si:0.1%, Cd:0.7%, Fe:0.02%, Al:0.3%, V:0.3%, rare earth: 0.02.

This formula is tried out on the 1000MW of the steam turbine limited-liability company nuclear power generating sets bearing of Harbin, respond well.

Claims

1. a bearing alloy material for high softening-point temperature, is characterized in that: comprise that following component and each constituent mass per-cent are: Sn:73.3%, Sb:14.43%, Cu:9.9%, Zn:0.3%, Ag:0.35%, Ni:0.09%, Mn:0.09%, As:0.10%, Si:0.1%, Cd:0.7%, Fe:0.02%, Al:0.3%, V:0.3%, rare earth: 0.02%.