研究目的
Investigating the influence of diamond particle size on the hardness and tribological behaviour of laser textured 316L stainless steel reinforced with CuCoBe + diamond composites produced by hot pressing.
研究成果
The study demonstrated that laser texturing and reinforcement with CuCoBe + diamond composites significantly improve the tribological properties of 316L stainless steel, especially with larger diamond particles. The 316L + C_40-60 sample showed the best performance, suggesting potential applications in automotive piston rings.
研究不足
The high wear experienced by the cast iron counter body might be a limitation to the use of this pair in piston ring applications. Further studies on the tribological behaviour under lubricated conditions and increasing temperatures are required.
1：Experimental Design and Method Selection
The study involved mechanical alloying of CuCoBe and synthetic diamond powders with different particle sizes, laser texturing of 316L stainless steel, and consolidation/sintering by hot pressing. The tribological behaviour and hardness of the composites were evaluated.
2：Sample Selection and Data Sources
Samples included unreinforced 316L stainless steel and CuCoBe alloy, and their composites reinforced with diamond particles of sizes 0.1-0.5 μm and 40-60 μm.
3：List of Experimental Equipment and Materials
Planetary ball mill (Fritsch Pulverisette 7), Nd: YAG laser (Sisma Laser), vacuum pressure-assisted sintering system with a high-frequency induction furnace, reciprocating pin-on-plate tribometer (Plint TE67-HT), SEM (Nano-SEM - FEI Nova 200), EDS (EDAX - Pegasus X4M), XRD (Bruker D8 Discover), laser diffraction analyser (Mastersizer 3000 from Malvern Panalytical).
4：Experimental Procedures and Operational Workflow
Mechanical alloying of powders, laser texturing of steel, hot pressing sintering, hardness testing, and tribological assessment under dry conditions.
5：Data Analysis Methods
Hardness was calculated using Vickers hardness tests and depth-sensing indentation. Wear volume was calculated based on mass difference and density. SEM, EDS, and 3D profilometry were used for post-tribological analysis.
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Nd: YAG laser
Sisma Laser
Sisma
Used for laser texturing of 316L stainless steel samples.
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SEM
Nano-SEM - FEI Nova 200
FEI
Used for morphological analysis of the samples.
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XRD
Bruker D8 Discover
Bruker
Used for structural analysis of the samples.
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Laser diffraction analyser
Mastersizer 3000
Malvern Panalytical
Used for determining the distribution of the particle sizes of the raw materials and mechanically alloyed blends.
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Planetary ball mill
Fritsch Pulverisette 7
Fritsch
Used for mechanical alloying of CuCoBe and synthetic diamond powders.
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Vacuum pressure-assisted sintering system
Used for consolidation/sintering of the powders by hot pressing.
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Reciprocating pin-on-plate tribometer
Plint TE67-HT
Plint
Used for tribological tests to evaluate the wear resistance and coefficient of friction of the samples.
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EDS
EDAX - Pegasus X4M
EDAX
Used for chemical composition analysis of the samples.
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