阅读说明：本技术 一种超低碳铁镍合金的烧结方法 (Sintering method of ultra-low carbon iron-nickel alloy ) 是由 杨虎 赵小杨 候春伟 将有群 于 2020-07-15 设计创作，主要内容包括：本发明公开了一种超低碳铁镍合金的烧结方法,属于金属加工技术领域。所述方法包括以下步骤：取造粒得到的羰基FeNi合金作为喂料,将所述羰基FeNi合金进行注塑,生成生坯,将所述生坯进行脱脂处理；将脱脂处理后的所述生坯进行烧结,所述烧结条件为：在氮气气氛中升温至800℃进行热脱；然后继续真空升温至1000-1100℃进行还原,最后在氩气保护下升温至1280-1320℃分压烧结。本发明能够降低羰基FeNi合金产品中的C含量,提高产品的延展性和折弯度。(The invention discloses a sintering method of an ultra-low carbon iron-nickel alloy, belonging to the technical field of metal processing. The method comprises the following steps: taking carbonyl FeNi alloy obtained by granulation as a feed, carrying out injection molding on the carbonyl FeNi alloy to generate a green body, and carrying out degreasing treatment on the green body; sintering the green body after degreasing treatment, wherein the sintering conditions are as follows: heating to 800 ℃ in nitrogen atmosphere for thermal desorption; then continuing to heat to 1000-1100 ℃ in vacuum for reduction, and finally heating to 1280-1320 ℃ under the protection of argon for partial pressure sintering. The invention can reduce the C content in the carbonyl FeNi alloy product and improve the ductility and the bending degree of the product.)

1. The sintering method of the ultra-low carbon iron-nickel alloy is characterized by comprising the following steps of:

taking carbonyl FeNi alloy obtained by granulation as a feed, carrying out injection molding on the carbonyl FeNi alloy to generate a green body, and carrying out degreasing treatment on the green body;

sintering the green body after degreasing treatment, wherein the sintering conditions are as follows: heating to 800 ℃ in nitrogen atmosphere for thermal desorption; then continuing to heat to 1000-1100 ℃ in vacuum for reduction, and finally heating to 1280-1320 ℃ under the protection of argon for partial pressure sintering.

2. The method according to claim 1, wherein the specific method for heating to 800 ℃ in a nitrogen atmosphere for thermal desorption is as follows:

and (3) filling nitrogen into the sintering furnace, taking the nitrogen as protective gas, heating to 800 ℃ at the heating rate of 3-5 ℃/min, and keeping the temperature for 60-120min when the temperature is raised to 300 ℃ and 600 ℃ in the heating process.

3. The method as claimed in claim 1, wherein the specific method of vacuum heating to 1000-1100 ℃ for reduction comprises:

adjusting the vacuum value of the sintering furnace to 0.1-20pa, continuously heating to 1000-1100 ℃, and preserving the temperature for 60-180 min.

4. A method according to claim 3, characterized in that the vacuum value is 0.1-5 pa.

5. The method as claimed in claim 1, wherein the partial pressure sintering at 1280-1320 ℃ under the protection of argon comprises:

argon is filled into the sintering furnace, the temperature is raised from 1100 ℃ at 1000-fold to 1320 ℃ at 1280-fold under the protection of argon, the temperature rise time is raised for 150min at 120-fold, and then the temperature is maintained for 180min at 120-fold.

6. The method of claim 5, further comprising:

after partial pressure sintering, naturally cooling to 40 ℃ to obtain the ultra-low carbon iron-nickel alloy.

7. The method according to claim 1, wherein the green body is degreased by a specific method comprising:

the green body degreasing time is 6-8h, and the degreasing rate is more than or equal to 10.2%.

Technical Field

The invention relates to the technical field of metal processing, in particular to a sintering method of an ultra-low carbon iron-nickel alloy.

Background

With the rising, use and popularization of 5G, the iron-nickel alloy is separated from each metal. The iron-nickel alloy is mainly applied to signal products of 5G base stations, so that the signal receiving and transmitting process has good stability and stronger communication capacity. However, the yield strength, the extensibility and the bending degree of the iron-nickel alloy in the assembling mechanical property are very high requirements.

When preparing the iron-nickel alloy, the Fe powder and the Ni powder are mixed and granulated, then the granulated FeNi alloy is fed into a pressed blank, finally the FeNi alloy green blank is heated to a sintering temperature and is kept for a certain time, and the FeNi alloy with the required performance can be obtained after cooling.

In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:

when the conventional sintering method is adopted, the carburization phenomenon of the iron-nickel alloy feed can occur in the sintering process, and the performance of the iron-nickel alloy is influenced.

Disclosure of Invention

In order to solve the problems in the prior art, the embodiment of the invention provides a sintering method of an ultra-low carbon iron-nickel alloy. The technical scheme is as follows:

in a first aspect, a sintering method of an ultra-low carbon iron-nickel alloy is provided, which comprises the following steps:

taking carbonyl FeNi alloy obtained by granulation as a feed, carrying out injection molding on the carbonyl FeNi alloy to generate a green body, and carrying out degreasing treatment on the green body;

sintering the green body after degreasing treatment, wherein the sintering conditions are as follows: heating to 800 ℃ in nitrogen atmosphere for thermal desorption; then continuing to heat to 1000-1100 ℃ in vacuum for reduction, and finally heating to 1280-1320 ℃ under the protection of argon for partial pressure sintering.

Further, the specific method for heating to 800 ℃ in a nitrogen atmosphere for thermal desorption comprises the following steps:

and (3) filling nitrogen into the sintering furnace, taking the nitrogen as protective gas, heating to 800 ℃ at the heating rate of 3-5 ℃/min, and keeping the temperature for 60-120min when the temperature is raised to 300 ℃ and 600 ℃ in the heating process.

Further, the specific method for reducing by raising the temperature to 1000-1100 ℃ in vacuum comprises the following steps:

adjusting the vacuum value of the sintering furnace to 0.1-20pa, continuously heating to 1000-1100 ℃, and preserving the temperature for 60-180 min.

Further, the vacuum value is 0.1-5 pa.

Further, the specific method for sintering at a partial pressure of 1280-1320 ℃ under the protection of argon comprises the following steps:

argon is filled into the sintering furnace, the temperature is raised from 1100 ℃ at 1000-fold to 1320 ℃ at 1280-fold under the protection of argon, the temperature rise time is raised for 150min at 120-fold, and then the temperature is maintained for 180min at 120-fold.

Further, the method further comprises:

after partial pressure sintering, naturally cooling to 40 ℃ to obtain the ultra-low carbon iron-nickel alloy.

Further, the specific method for degreasing the green body comprises the following steps:

the green body degreasing time is 6-8h, and the degreasing rate is more than or equal to 10.2%.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, carbonyl FeNi alloy obtained by granulation is taken as a feed, the carbonyl FeNi alloy is subjected to injection molding to generate a green body, and the green body is subjected to degreasing treatment; sintering the degreased green body under the following sintering conditions: heating to 800 ℃ in nitrogen atmosphere for thermal desorption; then continuing to heat to 1000-1100 ℃ in vacuum for reduction, and finally heating to 1280-1320 ℃ under the protection of argon for partial pressure sintering. Thus, the carbonyl FeNi alloy green compact is subjected to thermal desorption in a nitrogen atmosphere, reduced under a vacuum condition and finally sintered under the protection of argon in a partial pressure manner, so that the problem of sintering and recarburization of the carbonyl FeNi alloy green compact is optimized and improved, and the problems of assembly bending or riveting fracture and cracking of a carbonyl FeNi alloy product with the wall thickness of less than 0.5mm are solved; the assembly performance of the carbonyl FeNi alloy product is improved; especially for some products with higher requirements on mechanical properties.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further detail below.