阅读说明：本技术 一种用于钎接Ta1/0Cr18Ni9的非晶态钎料及制备方法 (Amorphous brazing filler metal for brazing Ta1/0Cr18Ni9 and preparation method thereof ) 是由 刘帅宾 翟秋亚 于 2019-09-28 设计创作，主要内容包括：本发明设计了一种用于钎接钽/钢的非晶态钎料,由以下组分按照质量百分比组成,Ti为35%~40%,Zr为35%~40%,Cu为10%~20%,Co为5~10%,总计为100%。同时本发明还公开了一种有关该钎料的制备方法。本发明的非晶态钎料,具有优良的力学性能及耐腐蚀性能,在焊接试验中钎料与母材的润湿性好,得到的接头有效抑制了金属间脆性化合物的产生,接头性能较好,钎焊工艺操作简单,易于实现自动化,便于工程推广。(The invention designs an amorphous brazing filler metal for brazing tantalum/steel, which comprises the following components in percentage by mass, 35% of Ti ~ 40%, 35% of Zr ~ 40%, 10% of Cu ~ 20% and 5% of Co 5 ~ 10%, wherein the total is 100%.)

1. The amorphous brazing filler metal for brazing tantalum/steel is characterized by comprising the following components, by mass, 35% of ~ 40% of Ti, 35% of ~ 40% of Zr, 10% of ~ 20% of Cu, and 5% of Co 5 ~ 10%, wherein the total is 100%.

2. The method for preparing the amorphous solder according to claim 1, which is implemented by the following steps:

step one, melting and matching a brazing filler metal master alloy by using a WK-II type vacuum arc furnace, wherein the brazing filler metal master alloy comprises, by mass, 35% of ~ 40% of Ti, 35% of ~ 40% of Zr, 10% of ~ 20% of Cu and 5 ~ 10% of Co, wherein the total weight is 100%, and high-purity metals with the purity of 99.99% are used for all the components;

and step two, controlling the linear speed of a roller to be 5 ~ 7m/s by using a single-roller rapid solidification device, preparing the brazing filler metal master alloy ingot obtained in the step one into an alloy foil, wherein the thickness of the prepared alloy foil is 80 ~ 150 microns, the width of the prepared alloy foil is 5 ~ 10mm, and the length of the prepared alloy foil is 0.2 ~ 0.8.8 m, so that the brazing filler metal is obtained.

Technical Field

The invention belongs to the technical field of welding, relates to an amorphous brazing filler metal applied to brazing Ta1/0Cr18Ni9, and also relates to a preparation method of the brazing filler metal.

Background

The tantalum and the tantalum alloy have the characteristics of high density, high melting point, strong corrosion resistance, excellent high-temperature strength, good processability, weldability, excellent dynamic mechanical property and the like, and are widely applied to the fields of electronics, chemical engineering, aerospace, weapon systems and the like. The tantalum-steel composite structure commonly used in engineering can not only give full play to the advantages of respective materials of the base layer and the coating layer, but also is the best way for saving precious metals. However, the preparation and use process inevitably involves the problem of welding tantalum and steel.

At present, electron beam welding, explosion welding, argon arc welding and the like are adopted at home and abroad for tantalum steel welding. Tantalum being a refractory metal, tantalum not being melted during fusion welding and steelThe molten pool is offset when the molten pool is melted, so that the quality of the joint is influenced; meanwhile, the tantalum and the steel have larger difference in physical and chemical parameters, and a large amount of intermetallic brittle compounds are easily generated during welding, such as: fe₂Ta, TaC, etc., which degrade the mechanical properties of the joint.

In order to realize effective connection of tantalum/steel, firstly, melting of parent metal is avoided, so a brazing method is adopted; secondly, a proper brazing filler metal is designed to inhibit the generation of brittle intermetallic compounds and improve the performance of the joint.

Disclosure of Invention

The invention aims to provide an amorphous brazing filler metal for brazing Ta1/0Cr18Ni9, solve the problem of poor joint performance caused by the generation of brittle intermetallic compounds, and provide a preparation method of the brazing filler metal.

The technical scheme adopted by the invention is that the amorphous brazing filler metal for brazing tantalum/steel is prepared by selecting Ti-Zr-based brazing filler metal, adding Cu and Co into the Ti-Zr-based brazing filler metal to form a brazing filler metal master alloy, and the components are composed of the following components in percentage by mass: 35 to 40 percent of Ti, 35 to 40 percent of Zr, 10 to 20 percent of Cu and 5 to 10 percent of Co, and the total is 100 percent.

The invention adopts another technical scheme that a preparation method of the brazing filler metal is implemented according to the following steps:

step one, melting and matching a brazing filler metal master alloy by using a WK-II type vacuum arc furnace. According to the weight percentage, Ti accounts for 35-40%, Zr accounts for 35-40%, Cu accounts for 10-20%, Co accounts for 5-10%, and the total is 100%. High-purity metal with the purity of 99.99 percent is used as each component, and is melted and matched in an electric arc furnace to obtain a brazing filler metal master alloy ingot.

And step two, controlling the linear speed of a roller at 5-7m/s by using a single-roller rapid solidification device, and preparing the brazing filler metal master alloy ingot obtained in the step one into an alloy foil, wherein the thickness of the prepared alloy foil is 80-150 mu m, the width is 5-10 mm, and the length is 0.2-0.8 m. Thus obtaining the brazing filler metal.

The amorphous brazing filler metal has the advantages of good mechanical property and corrosion resistance, a brittle intermetallic compound phase is not easy to form, and a high-performance joint is easy to obtain. Tests prove that the brazing filler metal has good wettability with a base metal, the obtained joint effectively inhibits the generation of intermetallic brittle compounds, the joint performance is good, the brazing process is simple to operate, automation is easy to realize, and engineering popularization is facilitated.

Detailed Description

The present invention will be described in detail with reference to the following embodiments.

The amorphous brazing filler metal for brazing tantalum/amorphous brazing filler metal comprises the following components in percentage by mass: 35 to 40 percent of Ti, 35 to 40 percent of Zr, 10 to 20 percent of Cu and 5 to 10 percent of Co, and the total is 100 percent. The main functions of each element are as follows: ti and Ta are infinitely mutually soluble, and the difference of atomic radii is small, so that the brazing filler metal and the tantalum side can be effectively combined; the Zr and the Ta have good solid solubility and are beneficial to improving the amorphous nuclear capacity of the brazing filler metal; cu plays a role in solid solution strengthening in the Ti-Zr-based solder, and Co can improve the fluidity and the wettability of the solder. The positions of all elements in the brazing filler metal and the main components of the base metal in the periodic table of the elements are relatively close, and the intersolubility is relatively good, so the designed brazing filler metal can form relatively good wetting on the base metal.

Through the brazing process, the formed weld metal is composed of Ti-Ta-Zr-Cu-Co-Cr multi-principal-element alloy, belongs to high-entropy alloy, has a high-entropy effect, can effectively inhibit the generation of intermetallic compounds, tends to form solid solution, and obtains a brazed tantalum/steel joint with high performance.

The preparation method of the brazing filler metal is implemented according to the following method:

step one, melting and matching a brazing filler metal master alloy by using a WK-II type vacuum arc furnace. According to the weight percentage, Ti accounts for 35-40%, Zr accounts for 35-40%, Cu accounts for 10-20%, Co accounts for 5-10%, and the total is 100%. High-purity metal with the purity of 99.99 percent is used as each component, and is melted and matched in an electric arc furnace to obtain a brazing filler metal master alloy ingot.

And step two, controlling the linear speed of a roller to be 5-7m/s by using a single-roller rapid solidification device, and preparing the brazing filler metal master alloy ingot obtained in the step one into an alloy foil, wherein the thickness of the prepared alloy foil is 80-150 mu m, the width is 5-10 mm, and the length is 0.2-0.8 m. Thus obtaining the brazing filler metal.

Table 1 shows the content of the solder components in 3 examples of the present invention.

TABLE 1 table of contents of respective components in examples 1 to 3 of the high-entropy interlayer alloy of the present invention

Content of Components (wt%)	Ti	Zr	Cu	Co
					Example 1	35	50	10	5
Example 2	35	42.5	15	7.5
					Example 3	37.5	37.5	15	10