CN112063867A

CN112063867A - Preparation method of gamma-phase Zn-Ni alloy

Info

Publication number: CN112063867A
Application number: CN202010788399.XA
Authority: CN
Inventors: 杨卿; 王锐; 王争争; 石浩; 邹军涛; 梁淑华
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2020-12-11

Abstract

The invention discloses a preparation method of gamma-phase Zn-Ni alloy. And then pre-pressing the mixed powder into a cylindrical green body at room temperature, applying a total load of 300MPa to the cylindrical green body by using isostatic pressing, maintaining the pressure for 5-10 min, and further compacting the cylindrical green body. And then placing the cylindrical green body into an atmosphere protection sintering furnace for sintering to obtain the gamma-phase Zn-Ni alloy. Compared with the prior art, the invention has the advantages of low sintering temperature, less process flow, simple operation and low manufacturing cost on the process method, and the prepared alloy is a single gamma phase, thereby providing a new method for preparing the gamma phase Zn-Ni alloy.

Description

Preparation method of gamma-phase Zn-Ni alloy

Technical Field

The invention belongs to the technical field of refractory alloy preparation methods, and particularly relates to a preparation method of a gamma-phase Zn-Ni alloy.

Background

The surface of the steel casting is usually galvanized to improve the corrosion resistance of the casting, but the steel casting has high carbon and silicon contents, thick oxide skin, silica sand and the like on the surface, rough surface, and more sand holes and shrinkage cavities, so that hydrogen evolution overpotential can be reduced in the electroplating process, hydrogen is easy to separate out, metal is not easy to deposit on the surface of a workpiece, and a coating is easy to peel, bubble and have poor roughness, so that the difficulty of electroplating the steel casting is increased. The zinc coating has the defect of high corrosion speed, and in order to improve the corrosion resistance of the coating, in recent years, scientists develop a new Zn-Ni alloy process, and compared with the zinc coating, the Zn-Ni alloy coating has stronger corrosion resistance. Further, Zn-Ni alloys containing a single gamma phase are most resistant to corrosion. The Zn-Ni alloy coating is a good protective coating for a steel matrix and is widely applied to industries such as marine ships, avionics, automobiles and the like. The Zn-Ni alloy coating can be prepared by a magnetron sputtering method, and the target material required by magnetron sputtering is generally from Zn-Ni alloy. At present, a smelting method is adopted for preparing Zn-Ni alloy, and the smelting method has the disadvantages of complicated working procedures, large energy consumption and higher cost. Therefore, the method for preparing the gamma-phase Zn-Ni alloy with lower cost and simple process has practical significance for preparing the Zn-Ni alloy film.

Disclosure of Invention

The invention aims to provide a preparation method of a gamma-phase Zn-Ni alloy, wherein the prepared Zn-Ni alloy consists of a single gamma phase, and has the advantages of low preparation cost and simple process.

The technical scheme adopted by the invention is that the preparation method of the gamma-phase Zn-Ni alloy comprises the following specific operation steps:

step 1, uniformly mixing Ni powder and Zn powder to obtain mixed powder;

step 2, pressing the mixed powder obtained in the step 2 into a green body;

and 3, sintering the green compact pressed in the step 3 to obtain the gamma-phase Zn-Ni alloy.

The present invention is also characterized in that,

further, step 1 is specifically as follows:

ni powder and Zn powder are used as raw materials, and are mixed for 4 to 6 hours on a mixer in proportion, wherein the mass of the Ni powder accounts for 15 to 20 percent, and the balance is the Zn powder.

Further, step 2 is specifically as follows:

the mixed powder is firstly pressed into a cylindrical green body in a unidirectional mode through a press machine, then the cylindrical green body is applied with a total load of 300MPa at room temperature through an isostatic pressing machine, the pressure is maintained for 5-10 min, and the cylindrical green body is further compacted.

Further, step 3 is specifically as follows:

and (3) putting the cylindrical green body pressed in the step (2) into an atmosphere protection sintering furnace, sintering the powder sample at the heating rate of 10 ℃/min by solid-phase sintering treatment in the sintering furnace at the temperature of 380-400 ℃ under the condition of controllable argon atmosphere, preserving heat for 12-16 h, and then slowly cooling in the furnace.

And 3, introducing argon for protection in the whole process.

The cooling mode of the step 3 is furnace cooling.

The purity of the Ni powder is 99.9%, the particle size is 1-3 mu m, the purity of the Zn powder is 99.9%, and the particle size is 1-3 mu m.

The preparation mechanism is as follows: the Zn-Ni alloy is formed by mutual diffusion of Zn element and Ni element at a sintering temperature of 380-400 ℃, but the diffusion activation energy of the Zn element is smaller and the diffusion is easier relatively because the sintering temperature is closer to the melting point of Zn. The main occurrence is the diffusion of Zn element to Ni element, which is a diffusion-dissolution alloying process, and finally, a gamma-phase alloy is formed.

The beneficial effect of the invention is that,

according to the preparation method of the gamma-phase Zn-Ni alloy, when the mass of Ni powder accounts for 15-20%, sintering treatment is carried out in a sintering furnace at 380-400 ℃ at a heating rate of 10 ℃/min, and the prepared Zn-Ni alloy consists of a single gamma phase.

Drawings

FIG. 1 is a flow chart of the production process of the present invention;

FIG. 2 is an XRD pattern of a Zn-Ni alloy in example 1 of the present invention;

Detailed Description

The following detailed description of specific embodiments of the invention:

FIG. 1 shows a flow chart of the method for preparing a gamma-phase Zn-Ni alloy. The technical scheme is that Ni powder with the purity of 99.9% and the particle size of 1-3 mu m and Zn powder with the purity of 99.9% and the particle size of 1-3 mu m are uniformly mixed, then pressed into green bodies, and subjected to atmosphere protection and pressureless sintering to obtain the gamma-phase Zn-Ni alloy.

The method comprises the following specific steps:

step 1: mixing Ni powder with the purity of 99.9 percent and the particle size of 1-3 mu m and Zn powder with the purity of 99.9 percent and the particle size of 1-3 mu m in a V-shaped mixer for 4-6 h in proportion to ensure that the Ni powder and the Zn powder are uniformly mixed, wherein the mass of the Ni powder accounts for 15-20 percent, and the balance is the Zn powder;

step 2: firstly, performing unidirectional pressing and prepressing on the mixed powder by using a manual table type press to form a cylindrical green body, then loading the cylindrical green body into a rubber sleeve, vacuumizing and sealing the rubber sleeve, placing the rubber sleeve into an isostatic press, applying a total load of 300MPa at room temperature, maintaining the pressure for 5-10 min, and further compacting the cylindrical green body in the rubber sleeve;

and step 3: and (3) putting the cylindrical green body pressed in the step (2) into an atmosphere protection sintering furnace, sintering the powder sample at the heating rate of 10 ℃/min by solid-phase sintering treatment in the sintering furnace at the temperature of 380-400 ℃ under the condition of controllable argon atmosphere, preserving heat for 12-16 h, and then slowly cooling in the furnace.

Example 1

Step 1, mixing Ni powder with the purity of 99.9 percent and the particle size of 1-3 mu m and Zn powder with the purity of 99.9 percent and the particle size of 1-3 mu m in a V-shaped mixer for 4 hours in proportion to ensure that the Ni powder and the Zn powder are uniformly mixed; wherein the Ni powder accounts for 15 percent by mass, and the balance is Zn powder;

step 2, firstly, performing unidirectional pressing and prepressing on the mixed powder by a manual table type press to form a cylindrical green body, then, filling the cylindrical green body into a rubber sleeve, vacuumizing and sealing the rubber sleeve, putting the rubber sleeve into a miniature isostatic press, applying a total load of 300MPa at room temperature, maintaining the pressure for 5min, and further compacting the cylindrical green body in the rubber sleeve;

and 3, putting the cylindrical green body pressed in the step 2 into an atmosphere protection sintering furnace, sintering the powder sample at the heating rate of 10 ℃/min through solid-phase sintering treatment in the sintering furnace at the temperature of 400 ℃ under the condition of controllable argon atmosphere, preserving heat for 12h, and then slowly cooling in the furnace to obtain the gamma-phase Zn-Ni alloy.

As shown in fig. 2, it can be seen that the prepared sample is a single gamma phase.

Example 2

Step 1, mixing Ni powder with the purity of 99.9 percent and the particle size of 1-3 mu m and Zn powder with the purity of 99.9 percent and the particle size of 1-3 mu m in a V-shaped mixer for 4 hours in proportion to ensure that the Ni powder and the Zn powder are uniformly mixed; wherein the Ni powder accounts for 20% by mass, and the balance is Zn powder;

and 3, putting the cylindrical green body pressed in the step 2 into an atmosphere protection sintering furnace, sintering the powder sample at the heating rate of 10 ℃/min through solid-phase sintering treatment in the sintering furnace at the temperature of 400 ℃ under the condition of controllable argon atmosphere, preserving heat for 16h, and then slowly cooling in the furnace to obtain the gamma-phase Zn-Ni alloy.

Example 3

Step 1, mixing Ni powder with the purity of 99.9 percent and the particle size of 1-3 mu m and Zn powder with the purity of 99.9 percent and the particle size of 1-3 mu m in a V-shaped mixer for 6 hours in proportion to ensure that the Ni powder and the Zn powder are uniformly mixed; wherein the Ni powder accounts for 18 percent by mass, and the balance is Zn powder;

step 2, firstly, performing unidirectional pressing and prepressing on the mixed powder by a manual table type press to form a cylindrical green body, then, filling the cylindrical green body into a rubber sleeve, vacuumizing and sealing the rubber sleeve, putting the rubber sleeve into a miniature isostatic press, applying a total load of 300MPa at room temperature, maintaining the pressure for 10min, and further compacting the cylindrical green body in the rubber sleeve;

and 3, putting the cylindrical green body pressed in the step 2 into an atmosphere protection sintering furnace, solidifying and compacting a powder sample at a heating rate of 10 ℃/min through solid-phase sintering treatment in the sintering furnace at the temperature of 380 ℃ under the condition of controllable argon atmosphere, preserving heat for 14h, and then slowly cooling in the furnace to obtain the gamma-phase Zn-Ni alloy.

Compared with the traditional smelting method, the gamma-phase Zn-Ni alloy prepared by the method has the advantages of lower cost, simple process and easy implementation, and the prepared Zn-Ni alloy is a single gamma phase.

Claims

1. The preparation method of the gamma-phase Zn-Ni alloy is characterized by comprising the following specific operation steps of:

step 1, uniformly mixing Ni powder and Zn powder to obtain mixed powder;

step 2, pressing the mixed powder obtained in the step 2 into a green body;

and 3, sintering and cooling the green compact pressed in the step 3 to obtain the gamma-phase Zn-Ni alloy.

2. The method for preparing the gamma-phase Zn-Ni alloy according to claim 1, wherein the powder mixture of step 1 is as follows: mixing Ni powder and Zn powder in a mixer for 4-6 h according to the proportion, wherein the mass of the Ni powder accounts for 15-20%, and the balance is Zn powder.

3. The method for preparing a γ -phase Zn-Ni alloy according to claim 1, wherein the step 2 is specifically as follows:

4. The method for preparing a γ -phase Zn-Ni alloy according to claim 1, wherein step 3 is specifically as follows:

and (3) placing the cylindrical green body pressed in the step (2) into an atmosphere protection sintering furnace, sintering the powder sample through solid phase sintering treatment in the sintering furnace at the temperature rise rate of 10 ℃/min at 380-400 ℃, and preserving heat for 12-16 h.

5. The method for preparing gamma-phase Zn-Ni alloy according to claim 1, wherein step 3 is performed with argon protection.

6. The method for preparing a gamma-phase Zn-Ni alloy according to claim 1, wherein the cooling in step 3 is furnace cooling.

7. The method according to claim 1, wherein the Ni powder has a purity of 99.9% and a particle size of 1 to 3 μm, and the Zn powder has a purity of 99.9% and a particle size of 1 to 3 μm.