Study on friction and wear behaviors of antimony impregnated graphite with pressureless sintered SiC and 3D-printed SiC sealing materials pairs

doi:10.11949/0438-1157.20240248

Abstract

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

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

CLC Number:

TH 117.1

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.

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.

Figures/Tables 15

Fig.1 Pin and disk samples

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

Table 2 Physical properties of silicon carbide

热导率/

（W/(m·K)）

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

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

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

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

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

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

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

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

Fig.9 Surface topography of graphite pins before wear

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

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

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

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