电磁振动场施加对金属粉末注射成形性能的影响

刘瑞洋; 邹黎明; 胡可; 范长增

doi:10.7513/j.issn.1004-7638.2021.02.022

电磁振动场施加对金属粉末注射成形性能的影响

doi: 10.7513/j.issn.1004-7638.2021.02.022

刘瑞洋^{1, 2,},
邹黎明²,
胡可²,
范长增¹

1.
燕山大学材料科学与工程学院，河北秦皇岛 430105
2.
广东省材料与加工研究所，广东广州 510650

基金项目: 广东省国际科技合作专项（2018A050506010）；广州市对外科技合作专项（201907010030）；广东省科学院建设国内一流研究机构行动专项资金项目（2019GDASYL-0105077、2021GDASYL-20210302008）

详细信息

作者简介:
刘瑞洋（1993—），男，辽宁鞍山人，硕士，主要工作方向为粉末冶金动态注射成形和高氮奥氏体不锈钢，E-mail：lry1113@yeah.net

中图分类号: TF124
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出版历程
- 收稿日期: 2021-02-20
- 刊出日期: 2021-04-10

Effect of electromagnetic vibration field on the properties of metal powder injection molding

1.
College of Materials Science and Engineering, Yanshan University, Qinhuangdao 430105, Hebei, China
2.
Institute of Meterials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, Guangdong, China

摘要

摘要: 在金属粉末注射成形(MIM)过程中引入电磁振动场后，采用SEM和金相显微镜分析注射生坯和烧结样品的微观组织，系统评价注射生坯和烧结后样品的密度与力学性能。通过对比不同的振动参数对注射生坯性能的影响结果，从而获得最佳的振动参数。研究结果表明当振动场引入MIM注射成形过程后，相比于静态注射会显著提高生坯和烧结样品的密度和性能，且随着振动力场的加强，密度和性能皆出现先上升后下降的现象，这与喂料流动性有关。该工艺为突破目前MIM制备大型零部件困难的技术瓶颈提供了可能。
- 金属粉末注射成形 /
- 电磁振动场 /
- 密度 /
- 微观组织 /
- 力学性能
Abstract: The electromagnetic vibration field was introduced into the injection process of metal powder injection molding (MIM). The density and mechanical properties of the green body and sintered samples were systematically evaluated. Meanwhile, the microstructure of the green body and sintered samples was investigated by SEM and microscope. The effects of different vibration parameters on the performance of injection green body were studied to obtain the most suitable vibration parameters. The results show that when the vibration field is introduced into the MIM injection process, the density and properties of green body and sintered samples are significantly improved compared with the static injection proces. With the strengthening of the vibration field, both the density and properties increase firstly and then decrease, which is related to the feeding fluidity. The technology can provide a possibility for breaking through the technical bottleneck of preparing large parts with MIM.
- metal injection molding /
- electromagnetic vibration field /
- density /
- microstructure /
- mechanical property

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图 1 （a）动态注射机原理^[13]；（b）喂料DSC-TG曲线和（c）注射生坯图片

Figure 1. Schematic diagram of dynamic injection machine (a), DSC-TG curve (b) and green body (c)

下载: 全尺寸图片幻灯片

图 2 振动频率对注射生坯和烧结样品性能的影响(振幅30 μm)

(a)注射生坯密度；(b)烧结试样密度；(c)工程脱脂率；(d)收缩率

Figure 2. Effect of frequency on properties of injection green body and sintered samples(amplitude 30 μm)

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图 3 振幅对生坯和烧结样品性能的影响（频率3 Hz）

(a)注射生坯密度；(b)烧结试样密度；(c)工程脱脂率；(d)收缩率

Figure 3. Effect of amplitude on properties of injection green body and sintered samples (frequency 3 Hz)

下载: 全尺寸图片幻灯片

图 4 不同振动参数下注射生坯SEM形貌

(a)、(b)、(c)分别为静态注射时前端、中端、尾端注射生坯SEM形貌；(d)、(e)、(f)分别为振动频率3 Hz，振幅30 μm时前端、中端、尾端注射生坯SEM形貌；(g)、(h)、(i)分别为振动频率5 Hz，振幅30 μm时前端、中端、尾端注射生坯SEM形貌

Figure 4. SEM image of injecting green body generated under different vibration parameters

下载: 全尺寸图片幻灯片

图 5 不同振动参数下烧结样品的微观组织

(a)、(b)、(c)分别为静态注射时前端、中端、尾端烧结试样SEM形貌；(d)、(e)、(f)分别为振动频率3 Hz，振幅30 μm时前端、中端、尾端烧结试样SEM形貌；(g)、(h)、(i)分别为振动频率5 Hz，振幅30 μm时前端、中端、尾端烧结试样SEM形貌

Figure 5. Microstructure of sintered samples generated under different vibration parameters

下载: 全尺寸图片幻灯片

表 1 样品合金成分

Table 1. Alloy compositions of the sample %

C	N	Cr	Ni	Mo	Mn	其它	Fe
0～0.02	0.75～0.90	16.5～17.5	0～0.1	3.3～3.5	10～12	0～0.1	Balance

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表 2 在不同振动参数下螺旋线长度

Table 2. Helix length with different vibrating parameters

振动参数		螺旋线长度L/mm
频率/Hz	振幅/μm	螺旋线长度L/mm
0	0	101
1	30	148
2	30	119
3	30	139
4	30	127
5	30	119
3	5	125
3	15	130
3	45	129

下载: 导出CSV

表 3 不同参数下样品的力学性能

Table 3. Mechanical properties of samples generated under different parameters

合金	振动参数		密度/(g·cm⁻³)	氮含量/%	R_0.2/MPa	R_m/MPa	ε_P	洛氏硬度(HRC)
合金	频率/Hz	振幅/μm	密度/(g·cm⁻³)	氮含量/%	R_0.2/MPa	R_m/MPa	ε_P	洛氏硬度(HRC)
X₁₅CrMnMoN₁₇	0	0	7.50	0.75～0.78	676	825	2.5	22
X₁₅CrMnMoN₁₇	1	30	7.52	0.75～0.78	716	1010	7.0	26
X₁₅CrMnMoN₁₇	2	30	7.53	0.75～0.78	727	1000	8.5	28
X₁₅CrMnMoN₁₇	3	30	7.55	0.75～0.78	725	1040	12.0	28
X₁₅CrMnMoN₁₇	4	30	7.54	0.75～0.78	734	1030	10.5	31
X₁₅CrMnMoN₁₇	5	30	7.52	0.75～0.78	720	966	5.0	28
X₁₅CrMnMoN₁₇	3	5	7.51	0.75～0.78	701	906	6.9	26
X₁₅CrMnMoN₁₇	3	15	7.53	0.75～0.78	716	987	9.8	26
X₁₅CrMnMoN₁₇	3	45	7.53	0.75～0.78	720	1000	10.0	27

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