Nickel molybdenum titanium intermediate alloy and preparation method thereof

A master alloy, nickel-molybdenum technology, applied in the field of nickel-molybdenum-titanium master alloy and its preparation, can solve the problems of high density, affect the performance of titanium alloy, and high melting point of metal molybdenum, and achieve simple production process, stable product quality, and uniform element distribution. Effect

CN103397225AActive Publication Date: 2013-11-20宝钛特种金属有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-11-20

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Abstract

The invention relates to a nickel molybdenum titanium intermediate alloy. The alloy comprises the following components in percentage by weight: 68-72% of Ni, 28-32% of Mo, and 0.4-0.6% of Ti. A preparation method comprises the following steps of: firstly, calculating and weighing the required raw materials according to the components of the alloy; secondly, putting the raw materials into a crucible of a medium-frequency induction furnace, wherein the raw material of nickel and the raw material of molybdenum are in crossed placement, and the raw material of titanium is put at the gap of the two raw materials; thirdly, after low vacuum degree medium-frequency induction melting, casting into cylindrical ingots at 1300-1350 DEG C; fourthly, turning the cylindrical ingots into scraps. The added titanium element is conductive to overcoming the defect that the intermediate alloy is mingled with high-density molybdenum, the chemical components of the prepared nickel molybdenum titanium intermediate alloy are stable and uniform, the deviation of the main components is not more than 0.5%, and the preparation method is conductive to producing excellent titanium alloy ingots which are segregation-free and have no metallurgy mingling defect and comprise uniformly distributed elements of molybdenum and nickel.
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Description

technical field

[0001] The invention belongs to the technical field of master alloys, and in particular relates to a nickel-molybdenum-titanium master alloy and a preparation method thereof. Background technique

[0002] When the existing titanium alloy is smelted, there are two ways to add the alloy in the form of nickel and molybdenum pure metal, and in the form of titanium-molybdenum alloy and metal nickel. Due to the high melting point (2615°C) and high density (10.2g / cm2) of metal molybdenum 3 ), the melting of molybdenum and titanium-molybdenum alloy additives is insufficient, there is a hidden danger of forming high-density inclusions, and it is difficult to obtain ingots with uniform composition, which affects the performance of titanium alloys. Contents of the invention

[0003] The technical problem solved by the present invention is to design a nickel-molybdenum-titanium master alloy and its preparation method. When the titanium alloy is smelted, the alloy is a...

Examples

Embodiment 1

[0018] Step 1: Calculate according to the target composition of the nickel-molybdenum-titanium master alloy, the feeding amount is 15kg, and weigh the required weight of 10.5kg of electrolytic nickel, 4.43kg of molybdenum slab, and 0.07kg of titanium sponge.

[0019] Step 2: Place the electrolytic nickel and molybdenum slabs in the crucible of the intermediate frequency induction furnace in sequence, and place the titanium sponge in the gap between the above two raw materials.

[0020] Step 3: When the vacuum degree is 20Pa, the intermediate frequency induction furnace is powered, the initial power is 10kw, and the maximum power does not exceed 50kw. After all the materials are melted, overheat for 5 minutes and power off, and cast into cylindrical ingots when the temperature drops to 1300~1350°C.

[0021] Step 4: Sampling the upper and lower parts of the ingot for chemical composition analysis. The analysis results of the upper and lower parts are shown in the table below. ...

Embodiment 2

[0025] Step 1: Calculate according to the target composition of the nickel-molybdenum-titanium master alloy, the feeding amount is 13kg, and the required weight is 9.1kg of nickel scrap, 3.83kg of molybdenum scrap, and 0.07kg of pure titanium scrap.

[0026] Step 2: place nickel scraps and molybdenum scraps in the crucible of the intermediate frequency induction furnace in sequence, and add pure titanium scraps to the gap between the above two raw materials.

[0027] Step 3: When the vacuum degree is 15Pa, the intermediate frequency induction furnace is powered, the initial power is 10kw, and the maximum power does not exceed 50kw. After the material is completely melted, it is overheated for 6 minutes and the power is turned off. When the temperature drops to 1300~1350°C, it is cast into a cylindrical ingot.

[0028] Step 4: Sampling the upper and lower parts of the ingot for chemical composition analysis. The analysis results are shown in the table below. The analysis resu...