Effect of Sintering Process on Microstructure and Mechanical Property of Porous Ti

doi:10.12068/j.issn.1005-3026.2024.06.008

Abstract

Abstract:

Sintering is a critical step in the formation process of porous Ti. Porous Ti can be endowed with excellent mechanical properties by controlling sintering conditions. Porous Ti for liquid?solid filtration with a 60% space holder was manufactured using vacuum distillation sintering， which uses Mg powder and Mg particles as the space holder under different sintering conditions. The microstructure， compressive property and bending property were characterized and tested， providing a reference for the preparation and performance optimization of porous Ti. The results show that with increasing of sintering temperature and time， the pore size of porous Ti decreases， the porosity decreases， and the pore spheroidizes. When the sintering temperature is below 1 150 ℃， the axial shrinkage of porous Ti is always greater than the radial shrinkage. The yield strength and bending strength reach the maximum values of 158.60 MPa and 230.40 MPa respectively at a sintering temperature of 1 150 ℃ and a sintering time of 180 min.

Key words: porous Ti, vacuum distillation, porosity, yield strength, bending strength

CLC Number:

TG 146.2

Jia-hao ZHAO, Yang QU, Hong-jie LUO, Shi-jie YANG. Effect of Sintering Process on Microstructure and Mechanical Property of Porous Ti[J]. Journal of Northeastern University(Natural Science), 2024, 45(6): 816-822.

Figures/Tables 11

Table 1 Chemical composition of Ti powder, Mg powder and Mg particles

原料	质量分数/%											平均粒度/μm
原料	Ti	Mg	Fe	Mn	Cl	Zn	O	C	N	H	Si	平均粒度/μm
钛粉	99.8	0.01	0.06	0.01	0.03	—	0.32	0.03	0.02	0.02	0.02	50
镁粉	—	99.9	0.01	0.008	0.003	0.008	—	—	—	—	—	35
镁颗粒	—	99.9	0.01	0.008	0.003	0.008	—	—	—	—	—	1 500

Fig.1 Flow chart of porous Ti preparation

Fig.2 SEM images of section and locally amplified of the preform at 400 MPa

Fig.3 Sintering temperature, sintering time and internal shrinkage of Porous Ti

Fig.4 SEM image of porous Ti sintered at 1 150 ℃ for 120 min

Fig.5 SEM images of millimeter-level pore interior of porous Ti sintered at different temperature for 120 min

Fig.6 SEM images of millimeter-level pore interior of porous Ti sintered at 1 150 ℃ for different time

Fig.7 Stress-strain curves of porous Ti at different sintering temperatures and sintering time

Fig.8 Load?displacement curves of porous Ti at different sintering temperatures and sintering time

Table 2 Mechanical properties of porous Ti at different sintering temperatures

烧结温度	烧结时间	屈服强度	弹性模量	能量吸收	能量吸收效率	弯曲强度	弯曲模量
℃	min	MPa	GPa	MJ·m^-3	能量吸收效率	MPa	GPa
1 000	120	75.50	0.88	27.29	0.68	113.40	4.94
1 050		87.41	1.08	38.32	0.66	122.40	6.73
1 100		89.47	1.13	42.94	0.64	159.30	8.29
1 150		131.11	1.26	48.37	0.62	182.40	8.76
1 200		142.73	1.50	59.01	0.58	209.40	9.15

Table 3 Mechanical properties of porous Ti at different sintering time

烧结温度	烧结时间	屈服强度	弹性模量	能量吸收	能量吸收效率	弯曲强度	弯曲模量
℃	min	MPa	GPa	MJ·m^-3	能量吸收效率	MPa	GPa
1 150	60	87.29	1.14	41.55	0.64	152.70	5.39
	90	98.90	1.21	44.50	0.63	157.50	3.69
	120	131.11	1.26	48.37	0.62	182.40	8.76
	150	134.97	1.28	48.49	0.61	267.00	7.19
	180	158.60	1.33	59.12	0.59	230.40	10.16

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