SiC<sub>f</sub>/TC18复合材料界面热稳定性及元素扩散规律

陈维龙; 张育铭; 杨青; 姚红蕊; 王玉敏

SiC_f/TC18复合材料界面热稳定性及元素扩散规律

陈维龙¹,
张育铭²,
杨青^2, ,,
姚红蕊¹,
王玉敏^2, ,

1.
沈阳化工大学　材料科学与工程学院, 沈阳 110142
2.
中国科学院金属研究所师昌绪先进材料创新中心, 沈阳 110016

基金项目: 基础加强计划重点基础研究项目(TMC-00-02)

详细信息

通讯作者:
杨青，硕士，高级工程师，硕士生导师，研究方向为金属基复合材料　E-mail:qingyang@imr.ac.cn

王玉敏，博士，研究员，博士生导师，研究方向为金属基复合材料　E-mail:yuminwang@imr.ac.cn

中图分类号: TG146.23;TB331
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出版历程
- 收稿日期: 2023-12-22
- 修回日期: 2024-01-28
- 录用日期: 2024-02-03
- 网络出版日期: 2024-03-27
- 刊出日期: 2024-11-15

Interface thermal stability and element diffusion law of SiC_f/TC18 composites

1.
School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China
2.
Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, China

Funds: Key basic research projects of foundation strengthening plan (No. TMC-00-02)

摘要

摘要: 界面反应会对钛基复合材料的力学性能产生显著影响，为确定SiC_f/TC18复合材料的元素扩散及界面反应层长大规律，采用磁控溅射先驱丝法+热等静压工艺制备了SiC_f/TC18复合材料，并在不同温度(400、600、800 ℃)和时间(50、100、150、200 h)下进行热暴露实验，分析了热等静压态和热暴露态SiC_f/TC18复合材料的界面反应层厚度变化、元素分布及扩散规律。更为重要的是，本文阐明了元素互扩散的机制，总结了界面反应层厚度随热暴露时间的长大规律，揭示了SiC_f/TC18复合材料界面反应层产物主要为TiC。经计算，SiC_f/TC18复合材料界面指数因子为4.0 × 10⁻⁶ m/s^1/2，反应层长大激活能为80.31 kJ/mol，该材料在400 ℃以下时界面热稳定性优异。
- 钛基复合材料 /
- 互扩散 /
- 界面反应 /
- 反应产物 /
- 热稳定性
Abstract: Interfacial reaction will have a significant impact on the mechanical properties of titanium matrix composites. In order to determine the diffusion of elements and the growth law of interfacial reaction layer of SiC_f/TC18 composites, SiC_f/TC18 composites were prepared using magnetron sputtering precursor wire method and hot isostatic pressing process. Heat exposure experiments were conducted at different temperatures (400, 600, 800 ℃) and times (50, 100, 150, 200 h) to analyze the changes in interfacial reaction layer thickness, element distribution, and diffusion patterns of SiC_f/TC18 composites in hot isostatic pressing and hot exposure states. More importantly, this work elucidated the mechanism of element mutual diffusion, summarized the growth law of interface reaction layer thickness with heat exposure time, and revealed that the interface reaction layer products of SiC_f/TC18 composites are mainly TiC. After calculation, the interface index factor of SiC_f/TC18 composites was 4.0 × 10⁻⁶ m/s^1/2, the activation energy of reaction layer growth was 80.31 kJ/mol, the material exhibited excellent interfacial thermal stability at below 400 ℃.
- titanium matrix composite /
- interdiffusion /
- interface reaction /
- reaction products /
- thermal stability

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图 1 SiC_f/TC18复合材料先驱丝横截面SEM图像及EDS元素扫描选取的位置

Figure 1. Cross section SEM image of SiC_f/TC18 composites precursor wire and selected positions for EDS element scanning

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图 2 SiC_f/TC18复合材料热等静压态整体及界面组织形貌

Figure 2. Overall and interface morphology of SiC_f/TC18 composites in hot isostatic pressing state

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图 3 SiC_f/TC18复合材料热等静压态界面区域SEM像(a)和EPMA元素面分布图(b-i)

Figure 3. SEM image(a) and EPMA element maps of the hot isostatic pressing interface region(b-i) of SiC_f/TC18 composites

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图 4 SiC_f/TC18复合材料不同热暴露条件下的界面反应层形貌

Figure 4. Morphology of interface reaction layer in SiC_f/TC18 composites at different heat exposure conditions

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图 5 SiC_f/TC18复合材料热等静压态与200 h热暴露实验后的EBSD图像

Figure 5. EBSD images of SiC_f/TC18 composites in hot isostatic pressing state and after 200 h heat exposure experiment

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图 6 SiC_f/TC18复合材料800℃/200 h热暴露态SEM像和EPMA元素面分布图

Figure 6. SEM image(a) and EPMA element maps in heat exposure(b-i) of SiC_f/TC18 composites at 800℃/200 h

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图 7 EPMA元素扫描选取位置

Figure 7. Schematic diagram of EPMA point scanning positions

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图 8 SiC_f/TC18复合材料热等静压态XRD图谱

Figure 8. XRD pattern of SiC_f/TC18 composites in hot isostatic pressing

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图 9 SiC_f/TC18复合材料在不同热暴露条件下的XRD图谱

Figure 9. XRD pattern of SiC_f/TC18 composites under different thermal exposure conditions

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图 10 SiC_f/TC18复合材料各元素热压及热暴露过程中元素扩散示意图

Figure 10. Schematic diagram of element diffusion during hot pressing and exposure of SiC_f/TC18 composites

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图 11 SiC_f/TC18复合材料界面反应动力学曲线

Figure 11. Interfacial reaction kinetic curves of SiC_f/TC18 composites

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图 12 SiC_f/TC18复合材料反应层长大Arrhenius关系图

Figure 12. Arrhenius diagram of the interfacial reaction layer growth in SiC_f/TC18 composites

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表 1 SiC_f/TC18复合材料先驱丝EDS元素定量分析结果

Table 1. Quantitative analysis results of EDS elements in SiC_f/TC18 composites precursor wire (Mass fraction/%)

Position	C	Si	Ti	Al	Mo	V	Fe	Cr	Total
1	44.22	55.35	0.20	0.08	0.08	0.03	0.02	0.02	100.00
2	78.02	21.54	0.35	0.05	0.00	0.03	0.00	0.01	100.00
3	7.50	0.17	76.58	4.31	4.37	5.20	1.01	0.86	100.00
4	7.26	0.17	77.34	4.54	4.16	4.87	0.90	0.76	100.00
5	8.02	0.14	76.45	4.53	4.27	4.93	0.92	0.74	100.00

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表 2 SiC_f/TC18复合材料热暴露后的界面反应层厚度

Table 2. The thickness of the interface reaction layer of SiC_f/TC18 composites after heat exposure

Temperature /℃	Thickness of interfacial reaction layer / μm
Temperature /℃	50 h	100 h	150 h	200 h
400	0.61±0.26	0.61±0.27	0.61±0.32	0.61±0.26
600	0.62±0.17	0.64±0.21	0.65±0.33	0.67±0.25
800	1.28±0.30	1.48±0.37	1.62±0.39	1.90±0.29

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表 3 SiC_f/TC18复合材料热等静压态与200 h热暴露实验后的晶粒尺寸大小

Table 3. Grain size of SiC_f/TC18 composites in hot isostatic pressing state and after 200 h heat exposure experiment

Temperature /℃	Grain size /μm²
Temperature /℃	α phase	β phase	Overall size
RT	0.30	0.14	0.22
400	0.37	0.28	0.33
600	0.48	0.30	0.39
800	1.02	1.24	1.12

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表 4 SiC_f/TC18复合材料元素原子半径

Table 4. Element atomic radius of SiC_f/TC18 composites

Element symbol	C	Si	Ti	Al	Mo	V	Fe	Cr
Atomic radius/nm	0.077	0.134	0.144	0.143	0.139	0.132	0.124	0.128

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表 5 热等静压态反应层EPMA元素定量分析结果

Table 5. Quantitative analysis results of EPMA elements in the reaction layer of hot isostatic pressing state (Mass fraction/%)

Position	C	Si	Ti	Al	Mo	V	Fe	Cr	Total
1	31.67	5.00	59.97	0.84	1.01	0.99	0.21	0.31	100.00
2	23.68	2.94	67.75	1.59	1.67	1.48	0.38	0.51	100.00
3	17.51	1.64	71.18	2.52	2.97	2.53	0.77	0.88	100.00

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表 6 热暴露态800℃/200 h反应层EPMA元素定量分析结果

Table 6. Quantitative analysis results of EPMA elements in the reaction layer at 800℃/200 h under thermal exposure (Mass fraction/%)

Position	C	Si	Ti	Al	Mo	V	Fe	Cr	Total
1	20.98	2.48	76.07	0.07	0.04	0.33	0.01	0.02	100.00
2	12.45	0.32	86.57	0.21	0.04	0.39	0.01	0.01	100.00
3	10.13	0.18	87.18	1.54	0.26	0.62	0.03	0.06	100.00

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