Influence of Ultrafine Additives of Intermetallides on the Structure, Mechanical, and Tribotechnical Properties of Sintered Tin Bronze

IF 0.5 4区 工程技术 Q4 ENGINEERING, MECHANICAL Journal of Friction and Wear Pub Date : 2024-11-08 DOI:10.3103/S106836662470020X
L. N. Dyachkova, A. I. Letsko
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Abstract

The results of a study of the influence of the introduction of powders of intermetallic compounds of various compositions obtained by self-propagating high-temperature synthesis (SHS) with preliminary mechanical activation on the structure, mechanical, and tribological properties of sintered bronze are presented. It was found that the introduction of 0.2–0.5 wt % of nickel and titanium aluminides, both single-phase and two-phase, leads to an increase in the density and strength of sintered bronze; maximum strength is achieved with the introduction of 0.2 wt % aluminides. The dependence of the hardness of powder bronze on the amount and composition of the intermetallic compound differs from the dependence of strength; with the introduction of single-phase intermetallic compounds, the hardness increases with increasing additive content, and with two-phase intermetallic compounds it decreases. It has been shown that the introduction of aluminides ensures a refinement of the structure of the bronze during sintering, and at an additive content of 1 wt %, an increase in the amount of eutectoid (α + δ). The introduction of aluminides also has a positive effect on the tribological properties of sintered bronze. With the introduction of 0.5 wt % two-phase nickel aluminide and 0.2 wt % single-phase titanium aluminide, the seizure pressure and wear resistance increase by 2.8 times and 3.5 times, respectively. Adding 0.5 wt % of single-phase nickel, titanium, and iron aluminides allows reducing the friction coefficient to 0.009–0.011, and two-phase iron aluminide to 0.005. The introduction of iron aluminides most effectively increases the tribological properties of sintered bronze, so the seizure pressure increases to 10 MPa and wear resistance by almost 10 times. Aluminides help reduce the relief of the friction surface during adhesive wear of sintered bronze and the formation of microlacunae, which are additional reservoirs for lubrication. The smoothest friction surface and a higher content of microlacunae are observed in samples made of powder bronze with the addition of single-phase iron aluminide.

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金属间化合物超细添加剂对烧结锡青铜的结构、机械和摩擦技术性能的影响
研究结果介绍了通过自蔓延高温合成(SHS)获得的各种成分的金属间化合物粉末的引入和初步机械活化对烧结青铜的结构、机械和摩擦学特性的影响。研究发现,引入 0.2-0.5 wt % 的镍和钛铝化物(包括单相和双相)会导致烧结青铜的密度和强度增加;引入 0.2 wt % 的铝化物会达到最大强度。粉末青铜的硬度与金属间化合物的数量和组成的关系与强度的关系不同;在引入单相金属间化合物时,硬度会随着添加剂含量的增加而增加,而在引入两相金属间化合物时,硬度则会降低。研究表明,引入铝化物可确保青铜在烧结过程中结构细化,当添加剂含量为 1 wt % 时,共晶量(α + δ)会增加。铝化物的引入对烧结青铜的摩擦学特性也有积极影响。引入 0.5 wt % 的两相铝化镍和 0.2 wt % 的单相铝化钛后,咬合压力和耐磨性分别提高了 2.8 倍和 3.5 倍。添加 0.5 wt % 的单相镍、钛和铁铝化物可将摩擦系数降至 0.009-0.011,将两相铁铝化物降至 0.005。铁铝化物的引入最有效地提高了烧结青铜的摩擦学性能,使其抗压强度提高到 10 兆帕,耐磨性提高了近 10 倍。在烧结青铜的粘着磨损过程中,铝化物有助于减少摩擦表面的凸起,并有助于形成微腔,而微腔是润滑的附加贮槽。在添加了单相铁铝化物的粉末青铜样品中,可以观察到最平滑的摩擦表面和更高含量的微漆膜。
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来源期刊
Journal of Friction and Wear
Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
1.50
自引率
28.60%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.
期刊最新文献
Tribological Characteristics of a Friction Composition of Metal-Ceramic Powders and Carbon-Containing Additives on a Polymer Binder Method for Determination of the Friction Coefficient during Cold Rolling of Extra Thin Sheets Influence of Ultrafine Additives of Intermetallides on the Structure, Mechanical, and Tribotechnical Properties of Sintered Tin Bronze To Increase Wear Resistance of Screw Cylindrical Compression Springs Working with Coil Contacts Calculation and Analytical Prediction of Coating Wear during Tribological Tests Based on Models of Contact Fatigue Failure
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