Al粉添加量对汽车用热压注成形Al<sub>2</sub>O<sub>3</sub>粉末组织和性能的影响

戴红霞; 冯晓丽

doi:10.19591/j.cnki.cn11-1974/tf.2020.03.012

Al粉添加量对汽车用热压注成形Al₂O₃粉末组织和性能的影响

doi: 10.19591/j.cnki.cn11-1974/tf.2020.03.012

戴红霞^1, ,,
冯晓丽²

1.
扬州工业职业技术学院智能制造学院, 扬州 225127
2.
扬州大学电气与能源动力工程学院, 扬州 225009

详细信息

通讯作者:
戴红霞, E-mail: daizibi191319@126.com

中图分类号: TQ174
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出版历程
- 收稿日期: 2019-02-08
- 刊出日期: 2020-06-27

Effects of Al powders addition on microstructure and properties of automobile Al₂O₃ powders prepared by hot-pressing molding

DAI Hong-xia^{1
, ,},
FENG Xiao-li²

1.
Intelligent Manufacturing Institute, Yangzhou Polytechnic Institute, Yangzhou 225127, China
2.
College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225009, China

More Information

Corresponding author: DAI Hong-xia, E-mail: daizibi191319@126.com

摘要

摘要: 选择Al粉作为Al₂O₃粉末材料的改性剂, 采用热压注工艺制备汽车用Al₂O₃粉末材料试样, 研究不同Al粉添加量(质量分数)对Al₂O₃粉末材料组织结构和力学性能的影响。结果表明: Al₂O₃粉末热压注试样最大收缩率出现在长度方向, 最小收缩率出现于高度方向。随着Al粉质量分数的增加, Al₂O₃粉末热压注试样收缩率表现出先减小, 后稳定增加, 最后再减小的变化规律, 弯曲强度和体积密度降低, 气孔率显著升高, 试样挠度增高, 浇注得到更大孔径的结构, 同时试样中大尺寸孔径数量也显著增多。随着Al粉质量分数的增加, 试样中Al₂O₃衍射峰不断上升, 玻璃相的变化不大。加入质量分数8%的Al粉后, 试样断口区域生成了明显的颗粒结构, 说明试样主要发生沿晶断裂。
- Al₂O₃粉末 /
- Al粉 /
- 热压注 /
- 收缩率 /
- 力学性能
Abstract: The automobile Al₂O₃ powder samples were prepared by hot-pressing molding, using Al powders as the modifying agents, the effects of Al powder content by mass on the microstructure and mechanical properties of Al₂O₃ powder samples were studied. The results show that, the maximum shrinkage rate appears in the length direction of Al₂O₃ powder samples and the minimum one appears in the height direction. With the increase of Al powders content by mass, the shrinkage rate of Al₂O₃ powder samples decreases first and then increases steadily, and finally decreases. With the increase of Al powders content by mass, the bending strength and volume density of Al₂O₃ powder samples decrease, while the porosity increase significantly. In addition, the Al₂O₃ powder samples show a larger deflection, the structure with larger pore diameter can be obtained by hot-pressing molding, and the number of larger pore in Al₂O₃ powder samples also increases significantly. With the increase of Al powders content by mass, the diffraction peak of Al₂O₃ increases continuously, but the glass phase changes finitely. When the mass fraction of Al powders is 8%, the obvious grain structure is formed in the fracture area of Al₂O₃ powder samples and the intergranular fracture is mainly occurred.
- Al₂O₃ powders /
- Al powders /
- hot-pressing molding /
- shrinkage rate /
- mechanical properties

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图 1 实验用Al粉扫描电子显微形貌

Figure 1. SEM image of the Al powders used in experiment

下载: 全尺寸图片幻灯片

图 2 Al粉质量分数对Al₂O₃粉末热压注试样收缩率的影响

Figure 2. Effect of the Al powder mass fraction on the shrinkage rate of Al₂O₃ powder samples prepared by hot-pressing molding

下载: 全尺寸图片幻灯片

图 3 Al粉质量分数对Al₂O₃粉末热压注试样高温挠度的影响

Figure 3. Effect of the Al powder mass fraction on the high temperature deflection of the Al₂O₃ powder samples

下载: 全尺寸图片幻灯片

图 4 添加不同质量分数Al粉的Al₂O₃粉末材料孔径分布

Figure 4. Pore size distribution of the Al₂O₃ powder samples added by Al powders in the different mass fractions

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图 5 添加不同质量分数Al粉的Al₂O₃粉末材料X射线衍射图谱

Figure 5. XRD patterns of the Al₂O₃ powder samples added by Al powders in the different mass fractions

下载: 全尺寸图片幻灯片

图 6 添加不同质量分数Al粉的Al₂O₃粉末热压注试样断口显微形貌：(a) 0; (b) 8%

Figure 6. Fracture morphology of the Al₂O₃ powder samples added by Al powders in the different mass fractions: (a) 0; (b) 8%

下载: 全尺寸图片幻灯片

表 1 实验用原材料纯度及粒度特征

Table 1. Purity and particle size distribution of the raw materials used in experiment

原料	纯度/%	粒度分布/%
原料	纯度/%	D₁₀	D₅₀	D₉₀
增塑剂	≥99.95	7.5	34.4	104.0
Al₂O₃	≥99.5	3.2	15.9	40.5
Al粉	≥99.5	—	1.0~3.0	—

下载: 导出CSV

表 2 添加不同质量分数Al粉的Al₂O₃粉末热压注试样物理性能

Table 2. Physical properties of the Al₂O₃ powder samples added by Al powders in the different mass fractions

Al粉质量分数/%	气孔率/%	体积密度/(g·cm^-3)	抗弯强度/MPa
0	25.12	1.75	28.26
1	28.25	1.71	16.42
3	29.12	1.68	15.16
5	29.74	1.65	14.38
8	30.08	1.61	11.06

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