CN102061438B - Method for treating metal surface by using heated carbon monoxide - Google Patents
Method for treating metal surface by using heated carbon monoxide Download PDFInfo
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- CN102061438B CN102061438B CN2010105401984A CN201010540198A CN102061438B CN 102061438 B CN102061438 B CN 102061438B CN 2010105401984 A CN2010105401984 A CN 2010105401984A CN 201010540198 A CN201010540198 A CN 201010540198A CN 102061438 B CN102061438 B CN 102061438B
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Abstract
The invention belongs to the technical field of electronic packaging, and particularly relates to a method for treating metal surface by using heated carbon monoxide. In the method, surface treatment of a piece to be treated is performed by heated gas, wherein the gas is carbon monoxide, and the piece to be treated is a metal product or a product plated with the metal. The invention also provides metal which is obtained by the method and subjected to surface treatment and a product plated with the metal which is obtained by the method and subjected to the surface treatment and application of the metal and the product as lead frame materials. In the method, the surface of nickel metal is treated particularly by heating the carbon monoxide, and the adhesion property of the treated surface of the nickel metal and epoxy resin is improved substantially, so that the stability and humidity resistance of the nickel metal serving as the lead frame materials or the lead frame materials plated with nickel on the surfaces are improved; and the method has a simple operational process, is low in cost and easy to control, can be subjected to batch treatment, and does not have the defect of poor repeatability in a chemical corrosion method.
Description
Technical field
The invention belongs to technical field of electronic encapsulation, be specifically related to a kind of metal surface treating method, and the product that makes with this method, and the application of this product.
Background technology
In the Electronic Packaging field, mainly utilize epoxy resin to encapsulate at present.The adhesiveproperties of epoxy resin and lead frame directly has influence on the later stage use properties and the stability of this electronic unit.Because packaged material and the bonding defective of framework can cause like layering even so-called " puffed rice " phenomenon.Therefore, how to increase the two direct adhesiveproperties is the problem that this field receives much concern always.
Now people have looked for some solutions for this problem, as to handling to increase its surfaceness as the metallic surface that goes between; Perhaps the prescription of epoxy resin being improved makes its adhesiveproperties to metal be improved.Yet, except some the specular material, most metallic surface is very coarse, therefore the method through improving surfaceness is can improved degree limited.And, need manpower, the financial resources of labor to the improvement of Formulaion of epoxy resin also unusual difficulty.
In the current electronic unit usually with metallic copper as lead-in wire, if but, can improve its welding property and conductivity at the plating nickel on surface that copper goes between.Therefore the use of metallic nickel is also popular gradually.Although be main with copper in copper-nickel down-lead, because nickel is to be plated on copper line surface, therefore the surface treatment to this lead-in wire has in fact just become the surface treatment to metallic nickel.To the processing of nickel commonly used be thermal oxidation method, make the nickel metallic surface form one deck oxide film, but obviously do not improve effect.Adopt chemical corrosion method, its technology is difficult to control, poor repeatability.
Therefore, people need badly and seek a kind of nickel metallic surface treatment process, make that handling nickel metallic surface later significantly improves with the adhesiveproperties of epoxy resin, and operation with low cost and be easy to control.
Summary of the invention
Technical problem to be solved by this invention is to overcome when carrying out Electronic Packaging in the prior art; The adhesive property of epoxy resin and lead frame is not high; Cause layering and " puffed rice " phenomenon; And improve defectives such as DeGrain and repeatable difference when handling lead-in wire with thermal oxidation process, chemical corrosion method, a kind of product after handling with the method for heating carbon monoxide method process metal surfaces especially nickel metallic surface and by this method and uses thereof is provided.
Nickel metal after handling through method of the present invention or the goods that are coated with this nickel metal are largely increased as blaster fuse frame material in the Electronic Packaging and the adhesion property between the epoxy resin; And this method good reproducibility; Make the electron device after the encapsulation have more stable use properties; Simple to operate, with low cost.
Metal surface treating method provided by the invention comprises the steps: to utilize the heated air method to carry out surface treatment to pending, and wherein said gas is carbon monoxide, and described pending is metal or the goods that are coated with this metal.
Wherein, The processing condition of described heated air and method can be selected according to this area ordinary method; The present invention adopts following step to carry out: in vacuum tube furnace, feed CO gas; With CO gas heating, get final product in said pending the carbon monoxide atmosphere that is in heating.Described vacuum tube furnace heated air can be a seal form, also can blow-by not open closely goes into gas.Preferably, for keeping the temperature of reaction of said gas, adopt the air seal form.
In the present invention's one preferred implementation, the concrete operations step of described gas heating is: vacuum tube furnace is put into said pending in (1); (2) boiler tube is evacuated to below the 100Pa; (3) open gas source, in said boiler tube, feed CO gas, then sealing; (4) repeating step (2) and (3) are once; (5) furnace tubing makes CO gas be warming up to design temperature, and carbon monoxide contacts with said pending surface, gets final product.
Among the present invention, said vacuum tube furnace can be selected according to this area general knowledge, and wherein said boiler tube can seal and can keep the vacuum below the 100Pa, can be heated to more than 600 ℃ and Controllable Temperature; Said pending is placed on place, boiler tube flat-temperature zone, generally is the boiler tube middle portion; The mode of said furnace tubing can be wire spiral heating, globars heating.The used vacuum tube furnace of the embodiment of the invention adopts the globars heating, and employed vacuum tube furnace model is GSL-1400X.After feeding CO gas in the boiler tube, air pressure is generally 1-2 normal atmosphere, is generally 1 normal atmosphere and gets final product.Described Heating temperature is at 50 ℃～600 ℃, and for realizing preferable economical effectiveness and security consideration, the present invention selects 60 ℃～200 ℃ for use.The time of said heating can be selected according to this area general knowledge, for reaching surface treatment effect preferably, preferred 5 minutes～240 minutes of the present invention, for realize the better economic effect better be 10 minutes～60 minutes.
In the present invention's one preferred implementation, what described metal was preferable is nickel or copper, and better is nickel.The described goods that are coated with this metal preferable for being coated with the copper of nickel.Described goods can be processed different shape according to actual needs, like bulk, wire, strip or irregularly shaped, preferable are the copper cash of nickel plating.
The present invention also provides a kind of metal that is obtained by above-mentioned metal surface treating method or the goods that are coated with this metal.Wherein, what described metal was preferable is nickel or copper, and better is nickel; The described goods that are coated with this metal are preferable is the copper of nickel plating, better is the copper cash of nickel plating.When said metal was nickel, surface treated nickel metal that obtains and the adhesivity between the epoxy resin had significant improvement with respect to not surface treated nickel metal.
The present invention also provides said metal or has been coated with the application of the goods of this metal as blaster fuse frame material, and described metal is copper or nickel, and preferable is nickel.
All commercially available the getting of raw material, reagent and equipment that the present invention is used.
Among the present invention, but above-mentioned optimum condition arbitrary combination on the basis that meets this area general knowledge promptly gets each preferred embodiments of the present invention.
Positively effect of the present invention is:
1, the invention discloses a kind of heated air method of utilizing and handle the especially method of nickel metallic surface of metal.The present invention mainly utilizes the carbon monoxide of heating to handle metallic surface.In the present invention's one preferred implementation, the nickel metallic surface of handling through the inventive method and the adhesion property of epoxy resin are largely increased, thereby the stability and the humidity resistance of the copper lead-in wire of plating nickel on surface are improved significantly.
2, surface treatment method operating process of the present invention is simple, and is with low cost and be easy to control, be fit to produce in batches, the defective of repeatable difference in the chemical corrosion method can not occur.
Description of drawings
Fig. 1 is for to carry out surface-treated equipment synoptic diagram to the nickel metal.
Fig. 2 is the synoptic diagram of framework (Tab Pull) the adsorptive power test middle frame of effect embodiment 1.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1
Adopt equipment shown in Figure 1 that nickel metal frame material is carried out surface treatment:
Nickel metal frame material is placed in the boiler tube 2 in flat-temperature zone 3 parts; Through control panel 1 Heating temperature being set is 60 ℃, is made as heat-up time 60 minutes; Close air intake valve 4 and adopt and comprise mechanical pump 6 vacuum tightness of boiler tube 2 is evacuated to below the 100Pa, close drain tap 5 then; Unlatching air intake valve 4 is opened carbon monoxide source of the gas 8 and in this rough vacuum boiler tube 2, is fed CO gas, is a normal atmosphere until the boiler tube internal gas pressure; With above-mentionedly bleed, exhaust process repeats once, guarantees in the boiler tube 2 it is high-purity carbon monooxide; The heating schedule that operation has been set with globars 7 furnace tubings 2, thereby has formed surface treated nickel metal frame material.
Embodiment 2
Adopt equipment shown in Figure 1 that nickel metal frame material is carried out surface treatment:
Nickel metal frame material is placed in the boiler tube 2 in flat-temperature zone 3 parts; Through control panel 1 Heating temperature being set is 100 ℃, is made as heat-up time 60 minutes; Close air intake valve 4 and adopt and comprise mechanical pump 6 vacuum tightness of boiler tube 2 is evacuated to below the 100Pa, close drain tap 5 then; Unlatching air intake valve 4 is opened carbon monoxide source of the gas 8 and in this rough vacuum boiler tube 2, is fed CO gas, is a normal atmosphere until the boiler tube internal gas pressure; With above-mentionedly bleed, exhaust process repeats once, guarantees in the boiler tube 2 it is high-purity carbon monooxide; The heating schedule that operation has been set with globars 7 furnace tubings 2, thereby has formed surface treated nickel metal frame material.
Effect embodiment 1 framework bonding strength test (Tab Pull)
With epoxy resin not surface treated and embodiment 1～2 surface treated nickel metal frame material are encapsulated that (the epoxy resin model is Hysol GR868; Lot number is KL-G730-2); Under the test condition of PMC (Post Mold Cure) and MSL3 (Moisture Sensitive Level 3, IPC/JEDEC J-STD-020), test relatively both adhesion properties respectively then through Tab Pull adsorptive power.Carry out four Mechanics Performance Testings to surface treated nickel metal frame material among the not surface treated and embodiment 1～2 with epoxy encapsulation, get its MV.
One, framework adsorptive power testing method (Tab Pull)
Fig. 2 is the synoptic diagram of used test sample in the framework adsorptive power test (Tab Pull).
The testing method of this sample is:
(1) the structure curing according to Fig. 2 bonds together with surface treated nickel metal frame material 9～11 with epoxy resin 12;
(2) adopt omnipotent Tensile Tester to carry out tensile test: said frame material 9 and 10 is fixed on the pulling force platform; And said frame material 11 applied the pulling force shown in arrow P; Peel off each other until epoxy resin 12 and said frame material 11, get the valid data of maximum pull value for this time test.
The making method of this specimen is:
1, be placed on the press framework particular manufacturing craft and preheating;
2, the framework particular manufacturing craft is taken off and opens from press, put into said frame material 9～11;
3, be placed on the framework particular manufacturing craft on the press and about 20 seconds to said frame material preheating;
4, the said epoxy resin material of preheating cake;
5, about 40～50g epoxy resin material cake is put into barrel, start press, the beginning transfer mould is added in injection pressure on this material cake, and epoxy resin is injected in the framework particular manufacturing craft;
6, after transfer mould is accomplished, take off the framework particular manufacturing craft, open mould and take out packaged framework and numbering;
7, packaged framework was solidified 6 hours down at 175 ℃;
8, framework is put into damp case moisture absorption;
9, moisture absorption is good framework refluxes in reflow soldering;
10, with part unnecessary on the framework wipe out specimen.
Two, test result
With the nickel metal of heating carbon monoxide processing and the adhesion property of epoxy resin
Do not carry out the adsorptive power test to surface treated with embodiment 1～2 described surface treated nickel metal frame material, the result lists in the table 1.Can know that from table 1 after said surface treated nickel metal frame material was encapsulated and solidifies, the adhesive power of nickel metal frame material and epoxy resin can reach 166N, and under the test condition of MSL3, its adhesive power can be possessed more than the 100N still.Nickel metallic surface and the epoxy resin handled without plasma immersion formula ion implantation almost do not have adhesive power, and through after the processing of method described in the present invention, its adhesion property is significantly improved.
Table 1
Claims (5)
1. a metal surface treating method is characterized in that adopting the heated air method to carry out surface treatment to pending, and described gas is carbon monoxide, and said pending is metal or the goods that are coated with this metal;
The concrete operations step of described heated air is: vacuum tube furnace is adopted in (1), with said pending flat-temperature zone that places vacuum tube furnace; (2) boiler tube is evacuated to below the 100Pa; (3) open gas source, in boiler tube, feed CO gas, the air pressure of boiler tube is a normal atmosphere after charging into carbon monoxide; (4) repeating step (2) and (3) are once; (5) CO gas in the furnace tubing, Heating temperature is 50 ℃～600 ℃, be 5 minutes～240 minutes heat-up time, handles said pending surface with the carbon monoxide of heating.
2. metal surface treating method as claimed in claim 1 is characterized in that: described metal is nickel or copper, and the described goods that are coated with this metal are the copper of nickel plating.
3. handle metal that obtains or the goods that are coated with this metal by claim 1 or 2 described methods for one kind.
4. the copper lead-in wire that the goods that are coated with this metal as claimed in claim 3 are nickel plating.
5. metal as claimed in claim 4 or be coated with the application of the goods of this metal as blaster fuse frame material, described metal is nickel or copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105401984A CN102061438B (en) | 2010-11-11 | 2010-11-11 | Method for treating metal surface by using heated carbon monoxide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105401984A CN102061438B (en) | 2010-11-11 | 2010-11-11 | Method for treating metal surface by using heated carbon monoxide |
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| Publication Number | Publication Date |
|---|---|
| CN102061438A CN102061438A (en) | 2011-05-18 |
| CN102061438B true CN102061438B (en) | 2012-05-09 |
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| CN2010105401984A Expired - Fee Related CN102061438B (en) | 2010-11-11 | 2010-11-11 | Method for treating metal surface by using heated carbon monoxide |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1914355A (en) * | 2004-02-04 | 2007-02-14 | 本田技研工业株式会社 | Method for surface treatment of metal material |
| CN101012541A (en) * | 2007-02-14 | 2007-08-08 | 西安建筑科技大学 | Preparing technique of gas carburizing carbonide silk net copper-based composite material |
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2010
- 2010-11-11 CN CN2010105401984A patent/CN102061438B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1914355A (en) * | 2004-02-04 | 2007-02-14 | 本田技研工业株式会社 | Method for surface treatment of metal material |
| CN101012541A (en) * | 2007-02-14 | 2007-08-08 | 西安建筑科技大学 | Preparing technique of gas carburizing carbonide silk net copper-based composite material |
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| Publication number | Publication date |
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| CN102061438A (en) | 2011-05-18 |
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