阅读说明：本技术 一种3d打印钛合金粉的制备方法 (Preparation method of 3D printing titanium alloy powder ) 是由 梁啟文 蒋兆汝 刘春轩 张扬 陈杰 李清洲 于 2019-10-14 设计创作，主要内容包括：本发明公开了一种3D打印钛合金粉的制备方法,该制备方法包括以下步骤：材料准备：将开采的钛合金矿石进行充分溶解、过滤、除杂后得到电解液,使用钛合金电极棒置于电解液中进行电解；研磨制粉：钛合金电极棒取下固定研磨钛合金电极棒的表面,将钛合金研磨成细粉,转移到球磨机中研磨；熔融定型：熔炼室真空升温,将钛合金细粉吹入熔炼室中,熔融形成液体雾化形成钛合金小液滴,吹出熔炼室后冷却形成圆形颗粒粉末；筛分循环：将粉末充分冷却后,筛选、分级得到钛合金粉末。本发明的制备方法能够将将钛合金矿石中的钛提出使用,采用先研磨成粉再定型可以达到加快钛合金熔融的效率,减少熔融能耗。(The invention discloses a preparation method of 3D printing titanium alloy powder, which comprises the following steps: preparing materials: fully dissolving, filtering and removing impurities from the mined titanium alloy ore to obtain electrolyte, and placing a titanium alloy electrode bar in the electrolyte for electrolysis; grinding to prepare powder: taking down the surface of the fixed grinding titanium alloy electrode bar from the titanium alloy electrode bar, grinding the titanium alloy into fine powder, and transferring the fine powder into a ball mill for grinding; and (3) melting and shaping: heating the smelting chamber in vacuum, blowing titanium alloy fine powder into the smelting chamber, melting to form liquid, atomizing to form titanium alloy small droplets, blowing out the titanium alloy small droplets from the smelting chamber, and cooling to form circular granular powder; and (3) screening and circulating: and fully cooling the powder, and screening and grading to obtain the titanium alloy powder. The preparation method can extract and use titanium in the titanium alloy ore, and the efficiency of accelerating the melting of the titanium alloy can be achieved by grinding the titanium alloy ore into powder and then shaping the powder, so that the energy consumption of melting is reduced.)

1. A preparation method of 3D printing titanium alloy powder is characterized by comprising the following steps: the preparation method comprises the following steps:

(1) preparing materials: fully dissolving mined titanium alloy ore, filtering and removing impurities to obtain electrolyte, placing a titanium alloy electrode bar into the electrolyte for electrolysis, and electrolyzing titanium ions in the solution onto the titanium alloy electrode bar;

(2) grinding to prepare powder: taking down the prepared titanium alloy electrode bar, fixedly grinding the surface of the titanium alloy electrode bar, grinding the electrolyzed titanium alloy into fine powder, transferring the fine powder into a ball mill, and grinding the fine powder to a sufficient fineness to obtain titanium alloy fine powder;

(3) and (3) melting and shaping: firstly, heating a smelting chamber in vacuum, then blowing titanium alloy fine powder into the smelting chamber, melting to form liquid, atomizing to form titanium alloy small droplets, blowing out the titanium alloy small droplets from the smelting chamber, and cooling to form circular granular powder;

(4) and (3) screening and circulating: and (4) fully cooling the powder in the step (3), and screening and grading to obtain titanium alloy powder.

2. The preparation method of the 3D printing titanium alloy powder according to claim 1, characterized in that: in the step (1), the dissolving is to crush the titanium alloy ore powder and then place the crushed titanium alloy ore powder into a 50% nitric acid solution to be stirred and dissolved, the impurity removal is to perform physical filtration on the dissolved titanium alloy ore powder by using a 500-plus 600-mesh screen, remove heavy metal ions by using adsorption resin, and remove iron, zinc, calcium and copper elements in the solution by using a precipitation method.

3. The preparation method of the 3D printing titanium alloy powder according to claim 1, characterized in that: in the step (1), the current density is 4-8A/dm2 during electrolysis, the electrolysis temperature is 25-45 ℃, and the electrolysis time is 3-5 hours.

4. The preparation method of the 3D printing titanium alloy powder according to claim 1, characterized in that: in the step (2), the particle size of the titanium alloy ground into fine powder is 600-800um, and the particle size of the powder ground by the ball mill is 250-350 um.

5. The preparation method of the 3D printing titanium alloy powder according to claim 1, characterized in that: in the step (3), the temperature of the smelting chamber is 1655-1660 ℃, the vacuum degree is 10-20pa, and inert gas is used for blowing the titanium alloy fine powder into the smelting chamber.

6. The preparation method of the 3D printing titanium alloy powder according to claim 5, characterized in that: the melting chamber is internally provided with a baffle which is transversely arranged in the middle of the melting chamber and is right opposite to an air inlet of the melting chamber, when titanium alloy fine powder is blown into the melting chamber, the titanium alloy fine powder can just contact with the baffle, and the temperature of the baffle is 1675-1678 ℃.

7. The preparation method of the 3D printing titanium alloy powder according to claim 5, characterized in that: in the step (4), the powder is spherical, the particle size is 250-350um, and the oxygen content is 1400-1500 ppm.

Technical Field

The invention relates to the technical field of printing consumable material preparation, in particular to a preparation method of 3D printing titanium alloy powder.

Background

The 3D printing technology is a technology for manufacturing a three-dimensional part product by adding materials layer by layer through a 3D printing device according to a designed three-dimensional digital model, and this layer-by-layer build-up forming technology is also called additive manufacturing technology. The 3D printing technology integrates advanced technologies in many fields such as digital modeling, laser technology, electromechanical control technology, information technology, and material science, and is known as the core technology of the third industrial revolution. In recent years, 3D printing technology is gradually applied to manufacturing of actual products, wherein the 3D printing technology of metal materials is particularly rapidly developed. Metal 3D printing technology, being the leading and most promising technology in the entire 3D printing system, is an important direction of development for advanced manufacturing technologies. The flowability and uniformity of titanium alloy powder are key properties of powder materials for 3D printing technology, the spherical powder prepared by the existing preparation method is different, and the common particle morphology is as follows: spherical, dendritic, needle, granular, flake, etc., and generally suitable for 3D printing technology are spherical powders. The powder with higher particle sphericity has good fluidity, so that the conveying process is smoother even if the powder is finer, and conversely, the powder with lower particle sphericity has poor fluidity, so that the powder is not uniformly spread or the powder feeding is not smooth, and the forming quality of the 3D printing part is finally influenced. In addition, because the surface and the internal structure of the non-spherical powder are loose, certain air hole defects exist inside the 3D printing formed part of the non-spherical powder, and air holes inside the formed part of the spherical powder are little or even none. Further, titanium is considered to be a rare metal because it is dispersed in nature and difficult to extract, so that raw materials are extremely difficult to obtain in the production of titanium alloy powder, and there is a need for a method capable of producing titanium alloy powder which overcomes the above-mentioned drawbacks.

Disclosure of Invention

The invention aims to: aiming at the existing problems, the preparation method of the 3D printing titanium alloy powder is provided, titanium in the titanium alloy ore can be extracted and used, the efficiency of accelerating the melting of the titanium alloy can be achieved by grinding the titanium alloy powder firstly and then shaping the titanium alloy powder, and the energy consumption of melting is reduced.

In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:

a preparation method of 3D printing titanium alloy powder is characterized by comprising the following steps: the preparation method comprises the following steps:

(1) preparing materials: fully dissolving mined titanium alloy ore, filtering and removing impurities to obtain electrolyte, placing a titanium alloy electrode bar into the electrolyte for electrolysis, and electrolyzing titanium ions in the solution onto the titanium alloy electrode bar;

(2) grinding to prepare powder: taking down the prepared titanium alloy electrode bar, fixedly grinding the surface of the titanium alloy electrode bar, grinding the electrolyzed titanium alloy into fine powder, transferring the fine powder into a ball mill, and grinding the fine powder to a sufficient fineness to obtain titanium alloy fine powder;

(3) and (3) melting and shaping: firstly, heating a smelting chamber in vacuum, then blowing titanium alloy fine powder into the smelting chamber, melting to form liquid, atomizing to form titanium alloy small droplets, blowing out the titanium alloy small droplets from the smelting chamber, and cooling to form circular granular powder;

(4) and (3) screening and circulating: and (4) fully cooling the powder in the step (3), and screening and grading to obtain titanium alloy powder.

Further, in the step (1), the dissolving is to crush the titanium alloy ore and then place the crushed titanium alloy ore into a 50% nitric acid solution to be stirred and dissolved, and the impurity removal is to firstly use a 500-mesh 600-mesh screen to carry out physical filtration on the dissolved titanium alloy ore, then use adsorption resin to remove heavy metal ions, and use a precipitation method to remove iron, zinc, calcium and copper elements in the solution.

Further, in the step (1), the current density is 4-8A/dm2 during electrolysis, the electrolysis temperature is 25-45 ℃, and the electrolysis time is 3-5 hours.

Further, in the step (2), the particle size of the titanium alloy ground into fine powder is 600-800um, and the particle size of the powder after the ball mill grinding is 250-350 um.

Further, in the step (3), the temperature of the smelting chamber is 1655-1660 ℃, the vacuum degree is 10-20pa, and inert gas is used for blowing the titanium alloy fine powder into the smelting chamber.

Furthermore, a baffle plate is arranged in the smelting chamber transversely and is arranged in the middle of the smelting chamber and right opposite to an air inlet of the smelting chamber, when titanium alloy fine powder is blown into the smelting chamber, the titanium alloy fine powder can just contact with the baffle plate, and the temperature of the baffle plate is 1675-.

Further, in the step (4), the powder is spherical, the particle size is 250-350um, and the oxygen content is 1400-1500 ppm.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the raw material adopted by the preparation of the 3D printing titanium alloy powder is titanium alloy ore, the raw material is easy to obtain, the powder is directly prepared after the titanium alloy is directly extracted by electrolysis, the powder does not need to be prepared into a fixed shape, and the raw material can be fully utilized;

2. the titanium alloy is firstly crushed and fully ground to the required granularity by a ball mill, but the titanium alloy which is ground into powder has extremely high requirements on the shape of aluminum alloy powder particles as a 3D printing material, so that the aluminum alloy which is ground into powder is liquefied by vacuum heating to form liquid drops, and then is evaporated and cooled to form circular liquid drops;

3. the preparation method provided by the invention has the advantages that the aluminum alloy is ground firstly and then heated for shaping, so that the melting speed of the aluminum alloy is accelerated, and the high-temperature baffle is arranged in the melting chamber, so that the aluminum alloy powder can be instantly dissolved at high temperature when contacting the baffle to form liquid which is evaporated and blown out, and the shaping speed of the aluminum alloy powder is accelerated;

4. the whole preparation method is simple, easy to operate, high in forming speed, low in loss of heating energy, and the process of grinding and forming is beneficial to improving the uniformity and the roundness of the aluminum alloy powder.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.