CN105274383A

CN105274383A - Rare earth (RE)-copper intermediate alloy and preparation method thereof

Info

Publication number: CN105274383A
Application number: CN201510754062.6A
Authority: CN
Inventors: 王飞
Original assignee: Hubei Weiweian Science & Technology Co Ltd
Current assignee: Hubei Weiweian Science & Technology Co Ltd
Priority date: 2015-11-09
Filing date: 2015-11-09
Publication date: 2016-01-27

Abstract

The invention discloses a rare earth (RE)-copper intermediate alloy. The RE-copper intermediate alloy comprises RE metal accounting for 10-35% of the total quantity of copper alloy, and the balance copper and inevitable impurity elements. The RE metal elements include, by weight, 28-37% of La, 55-70% of Ce, 0-0.1% of Pr, 0-0.2% of Nd, 0-0.2% of Sm, 0-0.1% of yttrium, 0-0.1% of Eu, 0-0.1% of Gd, 0-0.1% of Tb, 0-0.1% of Dy, 0-0.1% of Ho, 0-0.1% of Er, 0-0.1% of Tm, 0-0.1% of Yb and 0-0.1% of Lu. The preparation method comprises the first step of selection of raw materials, the second step of material cutting, the third step of batching, the fourth step of material charging, the fifth step of vacuum pumping, the sixth step of smelting, the seventh step of casting, the eighth step of crushing and the ninth step of polishing and packaging. The chemical components of the RE-copper intermediate alloy prepared through the method are completely controlled within the range of the mass percent of the RE metal.

Description

A kind of Cu-RE master alloy and preparation method thereof

Technical field

Material of the present invention relates to rare-earth copper alloy casting applied technical field, is specially a kind of Cu-RE master alloy and preparation method thereof.

Background technology

China is as rare earth resources big country, and sell resource cheap by rare earth oxide raw ore or rare earth ferroalloy low-end product for general, overseas enterprise is domestic by exporting back after the deep processing of rare earth low-end product, is worth and adds decades of times.My company is striving for that Hubei Province vigorously supports lower increasing input in science and technology through letter committee and the Committee of Development and Reform, associating university media sets up Research Base, expand industry size, in conjunction with existing rare earth magnesium ferrosilicon alloy consumer product upgrade requirement, implement this project. one is to realize like product import substitution, and significantly reduces user cost; Two is to optimize Products structure, develops the product innovation that added value is higher; Three is the posies that can create more jobs, and solves some of the staff's employment nearby; Four is carry out rare earth comprehensive utilization to rare-earth trade enterprise and deep processing has certain demonstration meaning.

Present rare earth is applied in cast copper alloy field and is mostly that adding single rare earth metal according to original casting technique, such blast-furnace man loses control of in the scaling loss amount of actual mechanical process middle-weight rare earths metal, because RE rare earth metal activity is very strong, preserve improper will oxidation at normal temperatures; Adopt old technique to add standard copper significant loss that refining agent can cause again about 4%, and quality product is uneven, qualification rate is low, it is feasible that laboratory adds RE rare earth metal in theory, but blast-furnace man will observe scaling loss amount by rule of thumb and repeatedly adds abundant stirring in actually operating, labour intensity is large, and Cu alloy material quality does not also ensure, does not promote.

Summary of the invention

The object of the present invention is to provide a kind of Cu-RE intermediate alloy material and preparation method thereof, constant in the former technique of intermediate frequency furnace cast copper alloy, do not change Cu alloy material chemical composition, adding this Cu-RE master alloy can refinement Cu alloy material crystal grain, reduce impurity purifying copper alloy substrate, increase the wear resistance of cast copper alloy material, erosion resistance, high thermal resistance, strengthen the mobility of cast copper alloy solution, extend the cutter life of cast copper alloy material mechanical processing, and stokehold actually operating is simply solidified, rake slag copper liquid loss minimizing reduces costs, applied range, practical.

For achieving the above object, the invention provides following technical scheme: a kind of Cu-RE master alloy, RE rare earth metal accounts for the 10-35% of copper alloy total amount, and surplus is copper and inevitable impurity element;

RE thulium is grouped into by the one-tenth of weight percent content: the lanthanum (La) of 28-37%, the cerium (Ce) of 55-70%, be less than the praseodymium (Pr) of 0.1%, be less than the neodymium (Nd) of 0.2%, be less than the samarium (Sm) of 0.2%, be less than the yttrium of 0.1%, be less than the europium (Eu) of 0.1%, be less than the gadolinium (Gd) of 0.1%, be less than the terbium (Tb) of 0.1%, be less than the dysprosium (Dy) of 0.1%, be less than 0.1% holmium (Ho), be less than 0.1% erbium (Er), be less than 0.1% thulium (Tm), be less than 0.1% ytterbium (Yb), be less than 0.1% lutetium (Lu).

Its preparation method comprises the following steps, step one, material choice; Step 2, blank; Step 3, batching; Step 4, charging; Step 5, vacuumizes; Step 6, melting; Step 7, casting; Step 8, broken; Step 9, polishing is packed.

Wherein in step one: select RE lanthanum cerium mischmetal metal and electrolytic copper as production starting material;

In step 2: RE lanthanum cerium mischmetal metal selects granularity suitable in conjunction with vacuum induction melting furnace plumbago crucible size by production formula requirement; Electrolytic copper plate is cut the lengthy motion picture shape into about 50mm-100mm by employing sheet shears, is convenient to layering blowing in plumbago crucible;

In step 3: adopt RE lanthanum cerium mischmetal metal and electrolytic copper to prepare burden; RE lanthanum cerium mischmetal metal and electrolytic copper part by weight are that 15:85 to 35:65 prepares burden according to the actual RE rare earth content that adds of user;

In step 4: by the raw material that step 3 proportional arrangement is good, the plumbago crucible of vacuum induction melting furnace is filled raw materials for production according to the order of one deck electrolytic copper and one deck RE lanthanum cerium mischmetal metal;

In step 5: vacuumize according to vacuum induction melting furnace production technique;

In step 6: regulate electric current to be progressively steadily warmed up to 1030 to 1080 degrees Celsius by power control pod with middle frequency, observe temperature by thyristor supply display screen;

In step 7: merged completely well by high pressure vacuum vision slit observation plumbago crucible Inner electrolysis copper and RE lanthanum cerium mischmetal metal, it is circular that rotatory vacuum induction melting furnace body imports to casting shape or square dies is cast;

In step 8: the Cu-RE master alloy of melting being cast takes out from vacuum melting furnace furnace chamber, be cooled to adopt after normal temperature artificial or hydraulic hammer is broken, granularity weight is 0.1kg-3kg;

In step 9: by Cu-RE master alloy oxide on surface brass wire brush polishing good for fragmentation, pack in the included plastic bag sealing protection against the tide of metal bucket by user's globule size proportion requirement.

Compared with prior art, add and the invention has the beneficial effects as follows: the degree of cleaning of intermediate frequency furnace cast copper alloy material find with reference to metallographic structure

1. β phase (matrix)+strengthening phase, grain fineness number is about more than 6 grades, and strengthening phase distribution is relatively even, and degree of cleaning meet the demands.

2. material physical property

Hardness all between 85-105, salable product; Metallographic is through observing all within acceptability limit; Mechanical property is Rm >=590MPa all, qualifiedly reaches excellent.

3. wear resistance

A. adding this novel rare-earth copper master alloy abrasion loss is 0.035mm, improves an order of magnitude than adding import copper master alloy fair wear and tear amount 0.4mm.

B. add this novel rare-earth copper master alloy stable friction factor about 0.093, and it is normal 0.1 close, qualified to add import copper master alloy.

3, cutting ability: adding the import copper master alloy cutter general continuous cutting life-span is 200, add the actual continuous cutting of this novel rare-earth copper master alloy 290, surpass the expectation 90, product has good cutting ability.

Embodiment

To be clearly and completely described technical scheme of the present invention above, obviously, described enforcement is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.

The invention provides a kind of technical scheme:

Embodiment:

A kind of rare-earth copper alloy and preparation method thereof, RE rare earth metal accounts for the 10-35% of Cu-RE master alloy total amount, and surplus is copper and inevitable impurity element;

RE thulium is grouped into by the one-tenth of following weight degree, (La) of 28-37% lanthanum, the cerium (Ce) of 55-70%, be less than 0.1% praseodymium (Pr), be less than 0.2% neodymium (Nd), be less than 0.2% samarium (Sm), be less than 0.1% yttrium, be less than 0.1% europium (Eu), be less than 0.1% gadolinium (Gd), be less than 0.1% terbium (Tb), be less than 0.1% dysprosium (Dy), be less than 0.1% holmium (Ho), be less than 0.1% erbium (Er), be less than 0.1% thulium (Tm), be less than 0.1% ytterbium (Yb), be less than 0.1% lutetium (Lu).

Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalents thereof.

Claims

1. a Cu-RE master alloy, RE rare earth metal accounts for the 10-35% of Cu-RE master alloy total amount, surplus is copper and inevitable impurity element, it is characterized in that: RE thulium is grouped into by the one-tenth of following weight degree, the lanthanum (La) of 28-37%, the cerium (Ce) of 55-70%, be less than the praseodymium (Pr) of 0.1%, be less than the neodymium (Nd) of 0.2%, be less than the samarium (Sm) of 0.2%, be less than the yttrium of 0.1%, be less than the europium (Eu) of 0.1%, be less than the gadolinium (Gd) of 0.1%, be less than the terbium (Tb) of 0.1%, be less than the dysprosium (Dy) of 0.1%, be less than 0.1% holmium (Ho), be less than 0.1% erbium (Er), be less than 0.1% thulium (Tm), be less than 0.1% ytterbium (Yb), be less than 0.1% lutetium (Lu).

2. a preparation method for Cu-RE master alloy, is characterized in that:

Comprise the following steps, step one, material choice; Step 2, blank; Step 3, batching; Step 4, charging; Step 5, vacuumizes; Step 6, melting; Step 7, casting; Step 8, broken; Step 9, polishing is packed;

In step 2: RE lanthanum cerium mischmetal metal selects granularity suitable in conjunction with vacuum induction melting furnace plumbago crucible size by production formula requirement; Adopt sheet shears electrolytic copper plate to be cut as length 50mm-100mm lengthy motion picture shape, be convenient to layering blowing in plumbago crucible;

In step 3: adopt RE lanthanum cerium mischmetal metal and electrolytic copper to prepare burden; RE lanthanum cerium mischmetal metal and electrolytic copper part by weight are that 15:85 to 35:65 prepares burden according to the actual weight adjustment adding RE rare earth metal of user;

In step 4: according to the order of one deck electrolytic copper and one deck RE lanthanum cerium mischmetal metal by the good raw material of the proportional arrangement of step 3, the plumbago crucible of vacuum induction melting furnace is filled raw materials for production;

In step 6: regulate electric current to be progressively steadily warmed up to 1030-1080 degree Celsius by power control pod with middle frequency, observe temperature by thyristor supply display screen;