CN104404445A - Chrome vanadizing process of automotive chain pin shaft - Google Patents
Chrome vanadizing process of automotive chain pin shaft Download PDFInfo
- Publication number
- CN104404445A CN104404445A CN201410657482.8A CN201410657482A CN104404445A CN 104404445 A CN104404445 A CN 104404445A CN 201410657482 A CN201410657482 A CN 201410657482A CN 104404445 A CN104404445 A CN 104404445A
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- CN
- China
- Prior art keywords
- chrome
- chromvanadizing
- bearing pin
- reductive agent
- vanadium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/34—Embedding in a powder mixture, i.e. pack cementation
- C23C10/52—Embedding in a powder mixture, i.e. pack cementation more than one element being diffused in one step
- C23C10/54—Diffusion of at least chromium
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention relates to a chrome vanadizing process of an automotive chain pin shaft with the advantages of larger load, wear resistance, corrosion resistance, oxidation resistance, good fatigue property and long service life. The finely-ground pin shaft is arranged in a converter, 60-70 percent of anhydrous borax, 10-15 percent of Cr2O3, 8-15 percent of V2O5 as a penetrating agent and a certain amount of reducing agent are simultaneously added into the converter, the converter is kept to be in a rotating state and is subjected to heat preservation for 10 hours at a temperature of 1000 plus or minus 2 DEG C, chrome vanadizing is performed, the pin shaft subjected to chrome vanadizing is poured into quenching oil to be quenched, and residual waste salt on the surface is boiled by using boiled water; after the reducing agent is added into salt bath, vanadium is reduced firstly, chrome is likely to be simultaneously reduced only when the reducing agent is excessive, and active vanadium, chrome alum and chrome vanadium boron atoms can be respectively obtained according to different consumptions of the reducing agent so as to realize vanadinizing, chrome vanadizing and chrome vanadium boronizing of steel.
Description
Technical field
The present invention relates to a kind of there is larger load, wear-resistant, anticorrosive, anti-oxidant, fatigue property is good and the chromvanadizing technique of the automobile chain bearing pin of long service life, belong to automobile component and manufacture field.
Background technology
CN102242335A, title " a kind of hardening and tempering method of bearing pin ", comprise the following steps: the first step, by the workpiece of required modifier treatment through grinding machine process, removes surface impurity; Second step, puts into hardening and tempering furnace by workpiece, closes fire door, is filled with nitrogen and carbo-nitriding gas, furnace temperature is risen to 510 DEG C to 790 DEG C, and maintenance furnace temperature instilled methyl alcohol by 60 minutes in 30 minutes simultaneously; 3rd step, when furnace temperature rises to 790 DEG C-950 DEG C, instillation kerosene, keeps furnace temperature 40-60 minute; 4th step, keeps nitrogen and carbo-nitriding gaseous tension, reduces furnace temperature gradually to 100 DEG C; 5th step, takes out workpiece, cools to room temperature; 6th step, cleaning workpiece surface.Its weak point: one is that Vanadized layer is very thin, resistance to high temperature oxidation and thermal fatigue property low, large load can not be born; Though two is that the high temperature oxidation resistance of Chromizing Layer is good, hardness is lower, and wear resistance is poor; Three is all easily form carbon-poor area under the chromising or Vanadized layer of low, medium carbon steel, therefore the workpiece worked under being only applicable to underloading.
Summary of the invention
Purpose of design: avoid the weak point in background technology, design a kind of there is larger load, wear-resistant, anticorrosive, anti-oxidant, fatigue property is good and the chromvanadizing technique of the automobile chain bearing pin of long service life.
Design: in order to realize above-mentioned purpose of design.The present invention on the chromizing technique basis of existing bearing pin, by changing penetration enhancer, and by further improvement to technical process, the requirement making the bearing pin after metallic cementation reach purpose of design to carry.Bearing pin through fine grinding is placed in converter by the present invention for this reason, adds salt bath formula (60% ~ 70% Borax pentahydrate, 10% ~ 15%Cr in converter simultaneously
2o
3, 8% ~ 15%V
2o
5, a certain amount of reductive agent), keep converter to be in turn state, and be incubated 10h in 1000 DEG C of environment, carry out chromvanadizing, the bearing pin after chromvanadizing pours quenching oil quenching into, and cooks off the remaining abraum salt in top layer with boiling water.When adding the oxide compound (Cr of chromium and vanadium in vitrified borax
2o
3, V
2o
5) after, part borax high temperature thermal decomposition and produce boron trioxide, now has three kinds of oxide compounds and deposits (B in salt bath
20
3, Cr
2o
3and V
2o
5).
Because known each element oxide stability descending order is as follows:
Ca Mg Zr Al Ti Si B Cr Nb V W
The each element be arranged in above can become the reductive agent of each element after it.It can thus be appreciated that, B in aforementioned three kinds of oxide compounds
20
3the most stable, Cr
2o
3take second place, V
2o
5stability is the poorest.After add reductive agent in salt bath, what be first reduced is vanadium, if reductive agent is excessive just likely restore chromium simultaneously.Consumption difference according to reductive agent can obtain active vanadium, chrome alum and chrome alum boron atom respectively, with realize steel vanadinizing, that chrome alum binary blends chrome alum boron is altogether ternary co-osmosized.When carrying out chromvanadizing, if with aluminium as reductive agent, then the following chemical reaction of main generation in salt bath:
2/5V
2O
5+4/3AI=4/5V+2/3AI
2O
3
2/3Cr
2O
3+4/3AI=4/3Cr+2/3AI
2O
3
Active vanadium chromium atom is obtained by above-mentioned two chemical reactions.After workpiece immerses salt bath, active vanadium chromium atom is adsorbed in the surface also inner layer diffusion of steel simultaneously, and vanadium and the carbon of chromium just and in steel matrix form respective carbide subsequently.Because the carbon in carbide comes from matrix, after ensureing matrix metallic cementation, still have enough carbon content, need the bearing pin starting material being used as metallic cementation to have higher carbon content (general carbon content answers >0.6%).
Technical scheme: a kind of chromvanadizing technique of automobile chain bearing pin, is placed in converter by the bearing pin through fine grinding, adds the Borax pentahydrate of 60% ~ 70% simultaneously, add the Cr of 10% ~ 15% in converter
2o
3, 8% ~ 15% V
2o
5as penetration enhancer, a certain amount of reductive agent, keep converter to be in turn state, and be incubated 10h in 1000 DEG C ± 2 DEG C environment, carry out chromvanadizing, the bearing pin after chromvanadizing pours quenching oil quenching into, and cooks off the remaining abraum salt in top layer with boiling water; After add reductive agent in salt bath, what be first reduced is vanadium, if reductive agent is excessive just likely restore chromium simultaneously, the consumption difference according to reductive agent can obtain active vanadium, chrome alum and chrome alum boron atom respectively, with realize steel vanadinizing, that chrome alum binary blends chrome alum boron is altogether ternary co-osmosized.
The present invention is compared with background technology, one is that the present invention adopts plasma surface alloying process to compare industrial single chromising of generally using or vanadinizing technique at present, seepage velocity is fast, and wear resistance, the antifraying property of co-penetration layer are stronger than single infiltration layer, avoid the pin hole that may occur in single infiltration layer; Two is metallographic contrasts: Fig. 1 is the metallograph of bearing pin after chromising process, Fig. 2 is the metallograph of bearing pin after chromvanadizing process, by in Fig. 2 I can find out the infiltration layer of chromvanadizing compare chromising infiltration layer will matter be close more, between infiltration layer and matrix, bonding strength is better, surface strength improves greatly, improves wear resisting property and shearing resistance; Wear resisting property contrasts:
Data presentation in upper table, 0 ~ T and in two time periods of T ~ 2T, the surface abrasion amount of chromvanadizing steel curved beam is all less than the surface abrasion amount of Chromized Steel sample.
The abrasion loss of unit surface infiltration layer is the density p of m, sample infiltration layer
Proximate calculation can go out amount of thickness reduction a=10000m/ ρ (μm) of sample infiltration layer
Suppose that the infiltration layer of chromising sample is by Cr
7c
3composition, its density is 6.68(g/cm
3), the infiltration layer of chromvanadizing sample is by Cr
7c
3with VC two portions composition, respectively account for half, its density is 6.03 (g/cm
3).Result is gone out by formula proximate calculation above.
Can draw thus: the co-penetration layer of chromvanadizing has better wear resistance than the co-penetration layer of chromising.
Accompanying drawing explanation
Fig. 1 is the metallograph of bearing pin after chromising process, amplifies 400 times of metallographs after bearing pin chromising.
Fig. 2 is the metallograph of bearing pin after chromvanadizing process, amplifies 400 times of metallographs after bearing pin chromvanadizing.
Embodiment
Embodiment 1: with reference to accompanying drawing 2.A chromvanadizing technique for automobile chain bearing pin, is characterized in that: the bearing pin through fine grinding is placed in converter, adds the Borax pentahydrate of 60% ~ 70% simultaneously, add the Cr of 10% ~ 15% in converter
2o
3, 8% ~ 15% V
2o
5as penetration enhancer, a certain amount of reductive agent, keep converter to be in turn state, and be incubated 10h in 1000 DEG C ± 2 DEG C environment, carry out chromvanadizing, the bearing pin after chromvanadizing pours quenching oil quenching into, and cooks off the remaining abraum salt in top layer with boiling water; After add reductive agent in salt bath, what be first reduced is vanadium, if reductive agent is excessive just likely restore chromium simultaneously, the consumption difference according to reductive agent can obtain active vanadium, chrome alum and chrome alum boron atom respectively, with realize steel vanadinizing, that chrome alum binary blends chrome alum boron is altogether ternary co-osmosized.Known each element oxide stability descending order is as follows: Ca, Mg, Zr, Al, Ti, Si, B, Cr, Nb, V, W, its each element be arranged in above can become the reductive agent of each element after it, at aforesaid B
20
3, Cr
2o
3, V
2o
5b in three kinds of oxide compounds
20
3the most stable, Cr
2o
3take second place, V
2o
5stability is the poorest, after add reductive agent in salt bath, what be first reduced is vanadium, if reductive agent is excessive just likely restore chromium simultaneously, consumption difference according to reductive agent can obtain active vanadium, chrome alum and chrome alum boron atom respectively, with realize steel vanadinizing, that chrome alum binary blends chrome alum boron is altogether ternary co-osmosized.The raw-material carbon content of metallic cementation bearing pin used is greater than 0.6%.The bearing pin adopting No. 80 steel to do material is through chromvanadizing rear pin shaft surface within T ~ 2T time, and surface abrasion amount is reduced to 4.29 mg/cm
2.Co-penetration layer thickness after chromvanadizing is 8 ~ 15 μm and alloying layer thickness is even.
It is to be understood that: although above-described embodiment to be contrasted detailed text description to mentality of designing of the present invention; but these text descriptions; just the simple text of mentality of designing of the present invention is described; instead of the restriction to mentality of designing of the present invention; any do not exceed mentality of designing of the present invention combination, increase or amendment, all fall within the scope of protection of the present invention.
Claims (5)
1. a chromvanadizing technique for automobile chain bearing pin, is characterized in that: the bearing pin through fine grinding is placed in converter, adds the Borax pentahydrate of 60% ~ 70% simultaneously, add the Cr of 10% ~ 15% in converter
2o
3, 8% ~ 15% V
2o
5as penetration enhancer, a certain amount of reductive agent, keep converter to be in turn state, and be incubated 10h in 1000 DEG C ± 2 DEG C environment, carry out chromvanadizing, the bearing pin after chromvanadizing pours quenching oil quenching into, and cooks off the remaining abraum salt in top layer with boiling water; After add reductive agent in salt bath, what be first reduced is vanadium, if reductive agent is excessive just likely restore chromium simultaneously, the consumption difference according to reductive agent can obtain active vanadium, chrome alum and chrome alum boron atom respectively, with realize steel vanadinizing, that chrome alum binary blends chrome alum boron is altogether ternary co-osmosized.
2. the chromvanadizing technique of automobile chain bearing pin according to claim 1, it is characterized in that: known each element oxide stability descending order is as follows: Ca, Mg, Zr, Al, Ti, Si, B, Cr, Nb, V, W, its each element be arranged in above can become the reductive agent of each element after it, at aforesaid B
20
3, Cr
2o
3, V
2o
5b in three kinds of oxide compounds
20
3the most stable, Cr
2o
3take second place, V
2o
5stability is the poorest, after add reductive agent in salt bath, what be first reduced is vanadium, if reductive agent is excessive just likely restore chromium simultaneously, consumption difference according to reductive agent can obtain active vanadium, chrome alum and chrome alum boron atom respectively, with realize steel vanadinizing, that chrome alum binary blends chrome alum boron is altogether ternary co-osmosized.
3. the chromvanadizing technique of automobile chain bearing pin according to claim 1, is characterized in that: the raw-material carbon content of metallic cementation bearing pin used is greater than 0.6%.
4. the chromvanadizing technique of the automobile chain bearing pin according to claim 1 or 3, is characterized in that: the bearing pin adopting No. 80 steel to do material is through chromvanadizing rear pin shaft surface within T ~ 2T time, and surface abrasion amount is reduced to 4.29 mg/cm
2.
5. the chromvanadizing technique of automobile chain bearing pin according to claim 1, is characterized in that: the co-penetration layer thickness after chromvanadizing is 8 ~ 15 μm and alloying layer thickness is even.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410657482.8A CN104404445B (en) | 2014-11-19 | 2014-11-19 | The chromvanadizing technique of automobile chain bearing pin |
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|---|---|---|---|
| CN201410657482.8A CN104404445B (en) | 2014-11-19 | 2014-11-19 | The chromvanadizing technique of automobile chain bearing pin |
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| CN104404445A true CN104404445A (en) | 2015-03-11 |
| CN104404445B CN104404445B (en) | 2017-12-01 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105088133A (en) * | 2015-08-28 | 2015-11-25 | 杭州东华链条集团有限公司 | Manufacturing process of high-abrasion-resistance chain |
| CN105112925A (en) * | 2015-08-28 | 2015-12-02 | 杭州东华链条集团有限公司 | High-wear-resistance chain |
| CN105239037A (en) * | 2015-11-02 | 2016-01-13 | 杭州持正科技股份有限公司 | Chain pin shaft surface vanadinizing strengthening process |
| CN105369257A (en) * | 2015-03-28 | 2016-03-02 | 青岛征和工业股份有限公司 | Surface thermal treatment method for high-carbon bearing steel precision part |
| CN105369192A (en) * | 2015-10-15 | 2016-03-02 | 青岛征和工业股份有限公司 | Method for lowering wear elongation ratio of tooth-shaped chain of engine |
| CN107858637A (en) * | 2017-12-11 | 2018-03-30 | 马鞍山蓝科再制造技术有限公司 | A kind of method of steel mold salt bath vanadizing |
| CN108277453A (en) * | 2018-02-06 | 2018-07-13 | 武汉理工大学 | A kind of high chromium Light deformation cold-punching mold surface chromvanadizing processing method |
| CN108300960A (en) * | 2018-03-06 | 2018-07-20 | 中国科学院海洋研究所 | Penetration enhancer and its application are expanded in a kind of surface of not metal-containing powders |
| CN115275251A (en) * | 2022-08-01 | 2022-11-01 | 沈伟 | A composite bipolar plate for fuel cell and its preparation method and application |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105369257A (en) * | 2015-03-28 | 2016-03-02 | 青岛征和工业股份有限公司 | Surface thermal treatment method for high-carbon bearing steel precision part |
| CN105088133A (en) * | 2015-08-28 | 2015-11-25 | 杭州东华链条集团有限公司 | Manufacturing process of high-abrasion-resistance chain |
| CN105112925A (en) * | 2015-08-28 | 2015-12-02 | 杭州东华链条集团有限公司 | High-wear-resistance chain |
| CN105369192A (en) * | 2015-10-15 | 2016-03-02 | 青岛征和工业股份有限公司 | Method for lowering wear elongation ratio of tooth-shaped chain of engine |
| CN105369192B (en) * | 2015-10-15 | 2018-11-16 | 青岛征和工业股份有限公司 | A method of reducing engine toothed chain wear elongation ratio |
| CN105239037A (en) * | 2015-11-02 | 2016-01-13 | 杭州持正科技股份有限公司 | Chain pin shaft surface vanadinizing strengthening process |
| CN107858637A (en) * | 2017-12-11 | 2018-03-30 | 马鞍山蓝科再制造技术有限公司 | A kind of method of steel mold salt bath vanadizing |
| CN108277453A (en) * | 2018-02-06 | 2018-07-13 | 武汉理工大学 | A kind of high chromium Light deformation cold-punching mold surface chromvanadizing processing method |
| CN108300960A (en) * | 2018-03-06 | 2018-07-20 | 中国科学院海洋研究所 | Penetration enhancer and its application are expanded in a kind of surface of not metal-containing powders |
| CN115275251A (en) * | 2022-08-01 | 2022-11-01 | 沈伟 | A composite bipolar plate for fuel cell and its preparation method and application |
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| CN104404445B (en) | 2017-12-01 |
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