CN102634752A - Boriding method of wear-resisting composite member - Google Patents
Boriding method of wear-resisting composite member Download PDFInfo
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- CN102634752A CN102634752A CN2012101345382A CN201210134538A CN102634752A CN 102634752 A CN102634752 A CN 102634752A CN 2012101345382 A CN2012101345382 A CN 2012101345382A CN 201210134538 A CN201210134538 A CN 201210134538A CN 102634752 A CN102634752 A CN 102634752A
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Abstract
The invention provides a boriding method of a wear-resisting composite member. The boriding method comprises the following steps: a) preheating the wear-resisting composite member by adopting a hot spray gun so as to rise the temperature of the surface of the wear-resisting composite member to be 800 DEG C-850 DEG C; b) spraying a boriding agent to the surface of the wear-resisting composite member obtained from the step a to obtain the wear-resisting composite member with the boronized surface. When the wear-resisting composite member is subjected to boriding, the wear-resisting composite member is preheated by using the hot spray gun, so that the temperature of the surface of a workpiece is high, the internal temperature of the workpiece is lower than the surface temperature of the workpiece, the brazing connection position of the composite member can not be affected, the connection strength of the composite member can not be affected, after the wear-resisting composite member is preheated, the boriding agent is sprayed to the surface of the composite member, the boriding agent is subjected to reaction under high temperature so as to generate active boron atoms, the active boron atoms combine with cobalt atoms and tungsten atoms melt in the surface, so as to form a compound, so that a boriding layer of a boron compound is formed.
Description
Technical field
The present invention relates to the field of surface treatment of wimet, relate in particular to a kind of boronizing method of wear-resisting subassembly.
Background technology
Boronizing technology is at high temperature to make boron infiltrate the metallic surface, to obtain a kind of thermo-chemical treatment technology of boron cpd hard boride layer.The alloying layer thickness of this technology is 20um～150um; Nitrided layer hardness and wimet hardness are approaching; Have excellent wear-resistant grain wearing and tearing and anti-erosion property, and can improve the resist chemical performance and raising product life of material, so boronizing technology is widely used in the intensified process of steel part.
Existing boronizing method has pack boriding, gas boriding and liquid boriding, and pack boriding and liquid boriding are mainly adopted in boronising in the metallic surface.Liquid boriding is to adopt borax salt bath in the external-heat crucible oven, and whole workpiece is hung and in the borax salt bath, carried out boronising during boronising, and the boronising temperature is about 1000 ℃.Pack boriding is workpiece to be imbedded pack boronizing medium put into induction heater and heat, and Heating temperature is generally 850 ℃～1050 ℃, and soaking time is 3h～6h.Pack boriding is applicable to complex geometry, comprises the part that has aperture, screw thread and blind hole; Liquid boriding is applicable to that geometrical shape simply needs quench treatment to improve the part of matrix strength after the boronising.
Wear-resisting subassembly often adopts the pack boriding method, to improve wear-resistant, the corrosion-resistant and work-ing life on wear-resisting subassembly surface.Wear-resisting subassembly is to be formed by connecting through brazing two kinds of different alloy materials, and alloy material generally is made up of wolfram varbide, bonding phase cobalt and carbon.The boronizing method of wear-resisting subassembly is that wear-resisting subassembly is imbedded pack boronizing medium, placed nearly airtight boronising container; Put into induction heater, stove is vacuumized reach more than the 100Pa, stop to vacuumize; Charge into rare gas element or hydrogen; After furnace gas reaches pressure, the beginning induction heating, the boronising temperature is 800 ℃～1300 ℃.This method has formed the film coating of one deck chemical vapour deposition at alloy surface; Wear-resistant, the erosion resistance and the work-ing life of alloy workplace have been improved; But adopt brazing to connect between the subassembly, in the process of wear-resisting subassembly pack boriding, the boronising temperature is near the brazing temperature; Therefore the subassembly welding zone melting welding occurs and comes off after the whole boronising; Influence the strength of joint of subassembly, the cobalt that diffuses out in the boronizing process simultaneously is easy to deposit and hinders the infiltration of boron atom and adhere to, thereby influences the boronising effect.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of boronising effect better and not to influence the boronizing method of wear-resisting subassembly strength of joint.
In view of this, the invention discloses a kind of boronizing method of wear-resisting subassembly, may further comprise the steps:
A) adopt thermic lance that wear-resisting subassembly is carried out preheating, make wear-resisting subassembly surface temperature reach 800 ℃～850 ℃;
B) boronizing agent is sprayed into the surface of the wear-resisting subassembly that step a) obtains, obtains the wear-resisting subassembly of surface boronizing.
Preferably, said wear-resisting subassembly is connected through brazing with stainless steel part by hard alloy piece and combines.
Preferably, said wear-resisting subassembly is installed on the rotary table.
Preferably, the Heating temperature of thermic lance described in the step a) is 900 ℃～1000 ℃.
Preferably, said boronizing agent places putting in the barrel of thermic lance.
Preferably, boronizing agent described in the step b) is Borax pentahydrate, yellow soda ash and rare earth.
Preferably, also comprise after the step b): adopt thermic lance to heat once more the wear-resisting subassembly of said surface boronizing, and insulation.
Preferably, the soaking time of said insulation is 1min～2min.
The invention provides a kind of boronizing method of wear-resisting subassembly, may further comprise the steps: a) adopt thermic lance that wear-resisting subassembly is carried out preheating, make wear-resisting subassembly surface temperature reach 800 ℃～850 ℃; B) boronizing agent is sprayed into the surface of the wear-resisting subassembly that step a) obtains, obtains the wear-resisting subassembly of surface boronizing.Boronizing method provided by the invention carries out preheating with thermic lance to wear-resisting subassembly earlier, makes workpiece surface temperature higher; The interior temperature is lower than surface temperature; Can not impact, more the phenomenon that welding zone melting welding comes off can not occur, influence the strength of joint of subassembly subassembly brazing junction; After the wear-resisting subassembly preheating, the expansion of subassembly surface adhesion agent cobalt fusion intergranular provides the space for the infiltration of boron atom; Subsequently boronizing agent is sprayed into the surface of subassembly, boronizing agent at high temperature reacts and produces the active boron atom, is combined into compound with the cobalt atom and the tungsten atom of surface melting, has formed the boride layer of boron cpd.The operation that this method then sprays after to the workpiece preheating, the problem of having avoided long embed type heating to cause cobalt deposition affects boron atom to infiltrate makes wear-resisting subassembly surface have boronising effect preferably.
Description of drawings
Fig. 1 is the structural representation of the wear-resisting subassembly of the present invention;
Fig. 2 is installed on the synoptic diagram of rotary table for wear-resisting subassembly;
Fig. 3 is the XRD figure of wear-resisting subassembly boride layer;
Fig. 4 is the low power fractograph of wear-resisting subassembly boride layer;
Fig. 5 is the high power fractograph of wear-resisting subassembly boride layer;
Fig. 6 is the cross hatching scanning spectra of wear-resisting subassembly boride layer.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiment of the invention is described, describe just to further specifying feature and advantage of the present invention but should be appreciated that these, rather than to the restriction of claim of the present invention.
The embodiment of the invention discloses a kind of boronizing method of wear-resisting subassembly, may further comprise the steps:
A) adopt thermic lance that wear-resisting subassembly is carried out preheating, make wear-resisting subassembly face surface temperature reach 800 ℃～850 ℃;
B) boronizing agent is sprayed to the surface of the wear-resisting subassembly that step a) obtains, obtain the wear-resisting subassembly of surface boronizing.
Step a) is the process of wear-resisting subassembly preheating, and the present invention adopts thermic lance that wear-resisting subassembly is carried out preheating, makes wear-resisting subassembly surface temperature higher, reaches the intergranular fusion of surface adhesion agent cobalt, for follow-up spraying is prepared.Said wear-resisting subassembly is preferably to be connected through brazing with stainless steel part by hard alloy piece and combines.In order to make the wear-resisting subassembly can thermally equivalent, as preferred version, said wear-resisting subassembly be installed on the rotary table, and in the whole process, worktable is in the rotary work state always.In order to guarantee that wear-resisting subassembly sticker cobalt can fully melt, reach the intergranular fusion, the Heating temperature of said thermic lance is preferably 900 ℃～1000 ℃.
After wear-resisting subassembly preheating, step b) is the process of wear-resisting subassembly surface spraying, and boronizing agent is sprayed to the surface of the wear-resisting subassembly of preheating, obtains the wear-resisting subassembly of surface boronizing.In order to make the more convenient to operate of boronising, as preferred version, said boronizing agent places putting in the barrel of thermic lance.Said boronizing agent is preferably Borax pentahydrate, yellow soda ash and rare earth.The boronizing agent of said components can improve the hardness of infiltration layer, increases the thickness of infiltration layer.As preferred version, also comprise after the step b): adopt thermic lance to heat once more the wear-resisting subassembly of said surface boronizing, and insulation.Heating once more after the boronising is evenly distributed the boron atom, forms uniform boride layer.The soaking time of said insulation is preferably 1min～2min.
Boronizing method provided by the invention carries out preheating with thermic lance to wear-resisting subassembly earlier, makes workpiece surface temperature higher; The interior temperature variation is little; Can not impact, more the phenomenon that welding zone melting welding comes off can not occur, influence the strength of joint of subassembly subassembly brazing junction; After the wear-resisting subassembly preheating; The intergranular fusion of subassembly surface adhesion agent cobalt provides the space for the infiltration of boron atom; Subsequently boronizing agent is sprayed into the surface of subassembly; Boronizing agent at high temperature reacts and produces the active boron atom, is combined into compound with the cobalt atom and the tungsten atom of surface melting, has formed the boride layer of boron cpd.The operation that this method then sprays after to the workpiece preheating, the problem of having avoided long heating to cause cobalt deposition affects boron atom to infiltrate makes wear-resisting subassembly surface have boronising effect preferably.
In order further to understand the present invention, below in conjunction with embodiment boronizing method provided by the invention is described in detail, protection scope of the present invention is not limited by the following examples.
Embodiment 1
A) wear-resisting subassembly is cooperated with shoulder core and clamping on rotary table; As depicted in figs. 1 and 2, Fig. 1 is the structural representation of wear-resisting subassembly, and Fig. 2 is installed on the synoptic diagram of worktable for wear-resisting subassembly; 01 is tungsten cobalt alloy spare among the figure; 02 is stainless steel part, and 03 is the workplace of wear-resisting subassembly, and 05 is workpiece punching axle.
B) will allocate good Borax pentahydrate, yellow soda ash and rare earth and place putting in the barrel of thermic lance;
C) start rotary table and light spray gun to workpiece outside surface even heating, and detect surface temperature with digital display induction temperature sensing appearance, temperature begins when reaching 850 ℃ on the workpiece circumference, evenly to spray boronizing agent, is formed with the wear-resisting subassembly of boride layer;
D) once more workpiece surface is incubated 2min with spray gun flame even heating after spraying finishes, makes boron atom osmotic even, naturally cooling promptly obtains having the wear-resisting subassembly of boride layer.
X-ray diffraction analysis, metallurgical analysis and energy spectrum analysis are carried out in the surface of the wear-resisting subassembly of step d) preparation, like Fig. 3, Fig. 4, Fig. 5 and shown in Figure 6.Fig. 3 is the XRD figure spectrum of wear-resisting subassembly boride layer, among Fig. 3 ◆ contain WC in the curve representation boride layer, contains CoWB in the ▲ curve representation boride layer, contains CoW in the ★ curve representation boride layer
2B
2, representes to contain in the boride layer CoB.Fig. 4 is the low power metallograph of wear-resisting subassembly boride layer, and wherein stain district part is infiltrated the district for the boron atom in the white portion, and boride layer thickness is 13um～38um.Fig. 5 is the high power metallograph of wear-resisting subassembly boride layer, schemes medium and small black patch for infiltrating the boron atom of alloy, can find out boron atom uniform distribution in matrix thus.Fig. 6 is a cross hatching scanning spectra after the wear-resisting subassembly boronising, shows in the boride layer in the collection of illustrative plates to have boron atom and cobalt atom.
The explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (8)
1. the boronizing method of a wear-resisting subassembly may further comprise the steps:
A) adopt thermic lance that wear-resisting subassembly is carried out preheating, make wear-resisting subassembly surface temperature reach 800 ℃～850 ℃;
B) boronizing agent is sprayed into the surface of the wear-resisting subassembly that step a) obtains, obtains the wear-resisting subassembly of surface boronizing.
2. boronizing method according to claim 1 is characterized in that, said wear-resisting subassembly is connected through brazing with stainless steel part by hard alloy piece and combines.
3. boronizing method according to claim 1 is characterized in that, said wear-resisting subassembly is installed on the rotary table.
4. boronizing method according to claim 1 is characterized in that, the Heating temperature of thermic lance described in the step a) is 900 ℃～1000 ℃.
5. boronizing method according to claim 1 is characterized in that said boronizing agent places putting in the barrel of thermic lance.
6. boronizing method according to claim 1 is characterized in that, boronizing agent described in the step b) is Borax pentahydrate, yellow soda ash and rare earth.
7. boronizing method according to claim 1 is characterized in that, also comprises after the step b): adopt thermic lance to heat once more the wear-resisting subassembly of said surface boronizing, and insulation.
8. boronizing method according to claim 7 is characterized in that, the soaking time of said insulation is 1min～2min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101345382A CN102634752A (en) | 2012-05-03 | 2012-05-03 | Boriding method of wear-resisting composite member |
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| CN2012101345382A CN102634752A (en) | 2012-05-03 | 2012-05-03 | Boriding method of wear-resisting composite member |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046058A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Method for realizing nitriding or carburizing by thermal airflow jetting heating and shot blasting |
| CN103046057A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Hot-air jetting heating and shot-peening energy injecting type chemical heat treatment furnace |
| CN103045989A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Nitriding and carburizing method by thermal airflow jetting heating and squeezing |
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| GB1422859A (en) * | 1972-10-27 | 1976-01-28 | Toyoda Chuo Kenkyusho Kk | Electrolytic process for hardening a limited region of a metallic surface |
| US4126488A (en) * | 1976-07-23 | 1978-11-21 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler | Boriding agent for boriding mass produced parts of ferrous and non-ferrous metals |
| CN88105363A (en) * | 1988-02-04 | 1988-09-28 | 南京工学院 | The controlled plating of the powder method of aluminium |
| CN1081209A (en) * | 1992-07-06 | 1994-01-26 | 机械电子工业部洛阳拖拉机研究所 | New particulate boronizing agent and compound method |
| CN1213014A (en) * | 1997-09-26 | 1999-04-07 | 麦克德莫技术股份有限公司 | Improved method for chromizing small parts |
| CN1933032A (en) * | 2005-09-16 | 2007-03-21 | 北京机电研究所 | Thermal-neutron shielding material and producing method thereof |
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2012
- 2012-05-03 CN CN2012101345382A patent/CN102634752A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1422859A (en) * | 1972-10-27 | 1976-01-28 | Toyoda Chuo Kenkyusho Kk | Electrolytic process for hardening a limited region of a metallic surface |
| US4126488A (en) * | 1976-07-23 | 1978-11-21 | Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler | Boriding agent for boriding mass produced parts of ferrous and non-ferrous metals |
| CN88105363A (en) * | 1988-02-04 | 1988-09-28 | 南京工学院 | The controlled plating of the powder method of aluminium |
| CN1081209A (en) * | 1992-07-06 | 1994-01-26 | 机械电子工业部洛阳拖拉机研究所 | New particulate boronizing agent and compound method |
| CN1213014A (en) * | 1997-09-26 | 1999-04-07 | 麦克德莫技术股份有限公司 | Improved method for chromizing small parts |
| CN1933032A (en) * | 2005-09-16 | 2007-03-21 | 北京机电研究所 | Thermal-neutron shielding material and producing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103046058A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Method for realizing nitriding or carburizing by thermal airflow jetting heating and shot blasting |
| CN103046057A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Hot-air jetting heating and shot-peening energy injecting type chemical heat treatment furnace |
| CN103045989A (en) * | 2013-01-25 | 2013-04-17 | 山东大学 | Nitriding and carburizing method by thermal airflow jetting heating and squeezing |
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Application publication date: 20120815 |