CN1004362B - Superalloy salt bath boronizing agent and preparation method thereof - Google Patents
Superalloy salt bath boronizing agent and preparation method thereof Download PDFInfo
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- CN1004362B CN1004362B CN85105832.9A CN85105832A CN1004362B CN 1004362 B CN1004362 B CN 1004362B CN 85105832 A CN85105832 A CN 85105832A CN 1004362 B CN1004362 B CN 1004362B
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- boronizing agent
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Abstract
The invention relates to boronizing agent adopting when superalloy carries out thermo-chemical treatment and preparation method thereof.The composition (% by weight) of boronizing agent: electrolytic aluminum 4～12%; Sodium-chlor 8～15%; Sodium carbonate 8～15%; Industrial borax 58～80%.The preparation of boronizing agent adopts substep to dry, fusing, the method for maintenance certain hour.The present invention is applicable to the boronising processing of carbon steel, the steel alloy large, medium and small dimension workpiece that particularly high-temperature alloy steel is made.Penetration enhancer good fluidity, corrodibility are little, easy cleaning, nuisanceless, reusable 20-40 time, cost is low, workpiece quality layer is good.
Description
Penetration enhancer of employing and preparation method thereof when the invention relates to superalloy and carrying out thermo-chemical treatment, particularly superalloy salt bath boronizing agent and preparation method thereof.
As everyone knows, the metalwork such as carbon steel, steel alloy is carried out to boronising processing, can improve hardness, wear resistance, fatigue strength and the erosion resistance of metallic surface.Composition of boronizing agent and preparation method thereof has larger impact to oozing part quality, production technique, operating environment etc.Industrial used boronizing agent has pressed powder penetration enhancer, paste, liquid salt bath penetration enhancer.At present conventional liq boronizing agent exist poor fluidity, corrodibility large, be difficult to the problems such as cleaning, particularly affected at home its widespread use.External boronizing agent generally forms by boron supplying agent, reductive agent, thinner and energizer, most penetration enhancer complicateds, and using fluorochemical as energizer, in boriding process process, produce the poisonous gas contaminate environment such as BF3, affect operator's health.And conventional salt bath boronizing agent or adopt the preparation of disposable hybrid system, though or substep preparation lack stabilization operation, or the method for stabilization is not good enough.The penetration enhancer purity and the poor stability that make like this, corrodibility is stronger, and the compactness of boride layer is poor, easily produces corrosion pit, and the conjugation of infiltration layer and matrix is poor, in use, easily peels off.
The object of this invention is to provide a kind of composition and simply, do not add energizer, soluble in water, applied widely, be particularly applicable to the salt bath boronizing agent of superalloy.
Feature of the present invention is in industrial boronising, to have solved preferably the problems referred to above that conventional liq boronizing agent exists, and can meet large, medium and small dimension workpiece and have the needs of inner hole part boronising.In preparation method, adopted by raw material substep dry, branch's fusing, stable processing sequence progressively.Because the process of boronising is the reaction process of an oxidation-reduction, and the raw material adopting is technical grade product, often to carry some impurity secretly and cause the complicated of reaction process, so conventional hybrid system has usually reduced the quality layer of workpiece surface due to the existence of impurity.
The present invention reduces the cross influence of impurity element in penetration enhancer component as far as possible.Impel penetration enhancer uniform ingredients with stable, overcome the detrimentally affect to quality layer of impurity that general mixed preparation method Raw carries secretly, thereby improved the boronising quality of workpiece.
Use the boronizing agent prepared of the present invention can improve the labor condition in boronizing process, easy to operate, process cycle is shorter, only needs to supplement normal consumption and be reusable 20～40 stoves and quality layer still meets the requirements in use procedure continuously.Owing to having deducted energizer, in production process, obviously reduce and pollute, and industrial raw material be easy to get, with low cost, there is significant Social benefit and economic benefit.
The present invention is using technical grade borax as boron supplying agent, and technical grade sodium-chlor and sodium carbonate is as thinner, and using the reductor-electrolytic aluminum of steelmaking process as reductive agent, its purity is more than or equal to 99.8%(weight), granularity is 60～100 orders.Boronizing agent composition (% by weight) is as follows;
Electrolytic aluminum: 4～12%
Sodium-chlor: 8～15%
Sodium carbonate: 8～15%
Industrial borax: 58～80%
The present invention is also applicable to the requirement of carbon steel, the boronising of common steel alloy product.
The present invention is first dried industrial borax under 550～650 DEG C of conditions, keep certain hour, then under 830～880 DEG C of conditions, melt, according to industrial borax quantity number keep < & & > time.Keep 4～6 hours for well with every 100 kilograms of industrial borax in general.After technical grade sodium-chlor and sodium carbonate mix, be dried and keep certain hour at 300～350 DEG C, then pour in industrial borax and mix and be warming up to 850～930 DEG C, keep 4～6 hours for well with every 100 kilograms of mixed solutions.Electrolytic aluminum is dried and keeps appropriate time at 150～180 DEG C, then joins in the mixed solution of industrial borax and sodium-chlor, sodium carbonate and mixes, and makes boronizing agent.In this preparation method, industrial borax, sodium-chlor and sodium carbonate, dried hold-time of electrolytic aluminum all calculate with every 25 millimeters of the bed thickness after spreading out for 1 hour.
Embodiment 1
150 kilograms of industrial borax are dehydrated to every 25 millimeters of calculating in 1 hour of bed thickness that the hold-time spreads out by borax at 600 DEG C.Then keep 8 hours at 850～900 DEG C, 10 kilograms of technical grade sodium-chlor and 10 kilograms of technical grade sodium carbonate are mixed, be dried at 350 DEG C, the hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, then pour into industrial borax liquid 900 DEG C mix thoroughly after, keep 6 hours.5 kilograms of electrolytic aluminums are dried at 150 DEG C, and the hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, then joins in industrial borax and sodium-chlor, sodium carbonate mixed solution, carries out even mixing and just makes 100 kilograms of boronisings that are suitable for No. 45 carbon steels.Alloying layer thickness Hm200g=1100～1600 after boronising, 70～150 microns of the degree of depth.
Embodiment 2
296 kilograms of industrial borax are dehydrated to every 25 millimeters of calculating in 1 hour of bed thickness that the hold-time spreads out by borax at 600 DEG C.Then 850 DEG C of fusings, keep 16 hours, 20 kilograms of technical grade sodium-chlor and 20 kilograms of technical grade sodium carbonate are mixed, be dried at 350 DEG C, hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, then pour in industrial borax solution 900 DEG C mix thoroughly after, keep 10～12 hours.The electrolytic aluminum of 12 kilograms is dried at 150 DEG C, hold-time wants within 1 hour, calculate by every 25 millimeters of thickness, then joins and in industrial borax and technical grade sodium-chlor, sodium carbonate mixed solution, carry out even mixing and just make 200 kilograms of boronizing agents that are suitable for 25Cr2MoV steel alloy.Alloying layer thickness Hm200g=1000～1500 after boronising, 70～150 microns of the degree of depth.
Embodiment 3
350 kilograms of industrial borax are dehydrated to 25 millimeters of calculating in 1 hour of layer thickness that the hold-time spreads out by borax at 600 DEG C.Then 850 DEG C of fusings, keep 16～20 hours.25 kilograms of technical grade sodium-chlor and 25 kilograms of technical grade sodium carbonate are mixed, be dried at 350 DEG C, the hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, then pour in industrial borax solution 900 DEG C mix thoroughly after, keep 12 hours.25 kilograms of electrolytic aluminums are dried at 150 DEG C, hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, join again in the technical grade sodium-chlor, sodium carbonate mixed solution of industrial borax and evenly mix, just make 2500 kilograms of boronizing agents that are suitable for K13 high-temperature alloy steel.Nitrided layer hardness Hm200g=1300～2100 after boronising, 20～40 microns of the degree of depth.
Embodiment 4
438 kilograms of industrial borax are dehydrated to every 25 millimeters of calculating in 1 hour of layer thickness that the hold-time spreads out by borax at 600 DEG C.Then 850 DEG C of fusings, keep 16～20 hours.30 kilograms of technical grade sodium-chlor and 30 kilograms of technical grade sodium carbonate are mixed, be dried at 350 DEG C, the hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, then pour in industrial borax solution 900 DEG C mix thoroughly after, keep 12 hours.21 kilograms of electrolytic aluminums are dried at 150 DEG C, hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, join again and in industrial borax and sodium-chlor, sodium carbonate mixed solution, carry out even mixing and just make 300 kilograms of boronizing agents that are suitable for Cr5Mo pearlite heatproof steel, nitrided layer hardness Hm200g=1100～1810 after boronising, 50～120 microns of the degree of depth.
Embodiment 5
71.5 kilograms of industrial borax are dehydrated to every 25 millimeters of calculating in 1 hour of bed thickness that the hold-time spreads out by borax at 600 DEG C.Then 850 DEG C of fusings, keep 4 hours.By 5 kilograms of technical grade sodium-chlor and 5 kilograms of technical grade sodium carbonate mix 350 DEG C dry, the hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, then pour in industrial borax solution 900 DEG C mix thoroughly after, keep 3 hours.4.25 kilograms of electrolytic aluminums are dried at 150 DEG C, hold-time needs within 1 hour, calculate by every 25 millimeters of thickness, then joins and in the technical grade sodium-chlor, sodium carbonate mixed solution of industrial borax, carry out even mixing and just make 50 kilograms of boronizing agents that are suitable for GH132 superalloy.Nitrided layer hardness Hm200g=1200～2000 after boronising, 20～40 microns of the degree of depth.
Claims (10)
1, a salt bath boronizing agent that is applicable to superalloy, wherein contains industrial borax, electrolytic aluminum, sodium-chlor and sodium carbonate, it is characterized in that the composition (% by weight) of this boronizing agent is:
Electrolytic aluminum: 4-12%
Sodium-chlor: 8-15%
Sodium carbonate: 8-15%
Industrial borax: 58-80%
2, boronizing agent as claimed in claim 1, is characterized in that the purity of electrolytic aluminum is more than or equal to 99.8%(% by weight), granularity is 60-100 order.
3, a preparation method for boronizing agent as claimed in claim 1, the steps include:
A, industrial borax are dewatered at 550～650 DEG C; keep enough time, the every 25 millimeters of calculating in 1 hour of bed thickness after the hold-time spreads out by borax, then melt and keep for some time; temperature of fusion is 830～880 DEG C, and the hold-time is every 100 kilograms of industrial borax 4～6 hours;
B, sodium-chlor, sodium carbonate are dried at 300～350 DEG C after mixing; keep enough time; every 25 millimeters of calculating in 1 hour of bed thickness after hold-time spreads out by two kinds of salt mixtures; then after mixing with the industrial borax of melting, keep for some time again; within 4～6 hours, be advisable with every 100 kilograms of mixed solutions, keeping temperature is 850～930 DEG C;
C, electrolytic aluminum are dried at 150～180 DEG C, keep enough time, and the every 25 millimeters of calculating in 1 hour of bed thickness after the hold-time spreads out by aluminium, then mix increasing even with industrial borax, sodium-chlor, the sodium carbonate of melting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85105832.9A CN1004362B (en) | 1985-08-02 | 1985-08-02 | Superalloy salt bath boronizing agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85105832.9A CN1004362B (en) | 1985-08-02 | 1985-08-02 | Superalloy salt bath boronizing agent and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85105832A CN85105832A (en) | 1986-06-10 |
| CN1004362B true CN1004362B (en) | 1989-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85105832.9A Expired CN1004362B (en) | 1985-08-02 | 1985-08-02 | Superalloy salt bath boronizing agent and preparation method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN1004362B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2058418A1 (en) * | 2007-11-09 | 2009-05-13 | Mustafa K. Ürgen | Method for boriding of coatings using high speed electrolytic process |
| CN102051572A (en) * | 2011-01-14 | 2011-05-11 | 宝钢集团新疆八一钢铁有限公司 | Surface boronizing treatment method of steel piece |
| CN103014608A (en) * | 2012-11-26 | 2013-04-03 | 姚芙蓉 | Carbon steel boriding agent |
| CN110306152A (en) * | 2018-12-03 | 2019-10-08 | 盐城金刚星精密锻造有限公司 | A kind of pinion steel surface boronizing process |
-
1985
- 1985-08-02 CN CN85105832.9A patent/CN1004362B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85105832A (en) | 1986-06-10 |
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| GR02 | Examined patent application | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |