浸锑石墨与无压烧结SiC和3D打印SiC密封材料配对副的摩擦磨损特性研究

doi:10.11949/0438-1157.20240248

摘要/Abstract

摘要：

为研究干气密封用密封材料的摩擦学特性，采用销盘旋转试验台研究3种浸锑石墨在干摩擦条件下分别与无压烧结SiC和3D打印SiC配对时的摩擦磨损特性，探讨了速度、载荷对密封材料摩擦磨损特性的影响，揭示了配对副材料表面的磨损机理。结果表明：随着载荷p与速度v的乘积（pv值）的增大，摩擦因数和磨损率均呈现逐渐减小趋势；在pv值较小时磨损机理为严重的磨粒磨损和轻微的黏着磨损，在pv值较高时磨损主要发生在碳化硅摩擦表面黏附的石墨转移层间，磨损机理主要表现为黏着磨损；在研究pv值变化对浸锑石墨与SiC密封材料配对副摩擦磨损特性的影响时，首选定载荷变速度试验方法。

关键词: 密封材料, 浸锑石墨, 无压烧结SiC, 3D打印SiC, 摩擦磨损特性, 磨损机理

Abstract:

In order to study the tribological properties of sealing materials for dry gas seals, the tribometer equipped with a rotating module was used to investigate the friction and wear characteristics of three kinds of antimony impregnated graphite when paired with pressureless sintered SiC and 3D-printed SiC under dry friction conditions. The effects of velocity and load on the friction and wear characteristics of sealing materials were analyzed, and the wear mechanisms on the surface of mating materials were revealed. The results show that the friction coefficient and wear rate gradually decreases with the increase of the product of load p and velocity v (pv value). When the pv value is low, the wear mechanism is severe abrasive wear and slight adhesive wear. When the pv value is high, the wear mainly occurs between the graphite transfer layers adhered to the silicon carbide friction surface, and the wear mechanism is mainly adhesive wear. In order to study the effect of pv value changes on the friction and wear characteristics of antimony impregnated graphite and silicon carbide sealing materials, the testing program which changes the velocity while fixing the load is preferable.

Key words: seal material, antimony impregnated graphite, pressureless sintered SiC, 3D-printed SiC, friction and wear behavior, wear mechanism

中图分类号:

TH 117.1

柴杨洋, 彭旭东, 江锦波, 孟祥铠, 马艺. 浸锑石墨与无压烧结SiC和3D打印SiC密封材料配对副的摩擦磨损特性研究[J]. 化工学报, 2024, 75(5): 1966-1976.

Yangyang CHAI, Xudong PENG, Jinbo JIANG, Xiangkai MENG, Yi MA. Study on friction and wear behaviors of antimony impregnated graphite with pressureless sintered SiC and 3D-printed SiC sealing materials pairs[J]. CIESC Journal, 2024, 75(5): 1966-1976.

图/表 15

图1 销盘试样

Fig.1 Pin and disk samples

表1 浸锑石墨的主要物理性能

Table 1 Physical properties of antimony impregnated graphite

材料	密度/（g/cm³）	硬度HS	抗弯强度/MPa	抗压强度/MPa	杨氏模量/GPa	热膨胀系数/℃	热导率/（W/(m·K)）
XY1	2.2	95	85	300	26	4.5	19
CY1	2.3	85	78	195	26	5	13
FY1	2.2	90	65	200	22	7	11

表2 碳化硅的主要物理性能

Table 2 Physical properties of silicon carbide

热导率/

（W/(m·K)）

图2 销盘圆周摩擦试验台示意图

Fig.2 Schematic of the pin-on-disk rotary test platform configuration employed

表3 变工况试验参数

Table 3 Variable operating condition test parameters

工况	速度v/(m/s)	载荷p/MPa	pv/(MPa·m/s)
定载荷变速度	1.0	2.0	2
	1.5		3
	2.0		4
	2.5		5
	3.0		6
定速度变载荷	2.0	1.0	2
		1.5	3
		2.0	4
		2.5	5
		3.0	6

图3 变工况条件下XY1与SS和LS配对副的摩擦因数时变曲线

Fig.3 The friction coefficient time-varying curve of XY1 with SS and LS pairs under variable operating conditions

图4 浸锑石墨/SS配对副摩擦因数随速度/载荷的变化曲线

Fig.4 Variation curves of the friction coefficient of antimony impregnated graphite and SS pairs with velocity or load

图5 不同pv值下3种石墨与SS配对时的磨损率的变化

Fig.5 Effect of different pv values on the wear rate of three graphites with SS pairs

图6 CY1与SS对磨后的表面SEM图

Fig.6 The SEM images of CY1 with SS after wear

图7 浸锑石墨分别与SS和LS配对时的摩擦因数比较

Fig.7 Comparison of the friction coefficient of antimony impregnated graphite with SS and LS pairs

图8 浸锑石墨分别与SS和LS配对时的磨损率比较

Fig.8 Comparison of the wear rate of antimony impregnated graphite with SS and LS pairs

图9 石墨销磨损前的表面形貌

Fig.9 Surface topography of graphite pins before wear

图10 SS圆盘磨损前后的表面SEM图

Fig.10 The SEM images of SS disk before and after wear

图11 LS圆盘磨损前后的表面SEM图

Fig.11 The SEM images of LS disk before and after wear

图12 XY1与SS和LS对磨后的表面SEM图

Fig.12 The SEM images of XY1 with SS and LS pairs after wear

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