Mechanochemistry of Silicate Glass Surface: Mixed Modifier Effect on Resistance to Frictional Subsurface Damage

硅酸盐玻璃表面的机械化学：混合改性剂对抵抗次表面摩擦损伤的影响

• 批准号: 2011410
• 负责人: Seong Kim
• 金额: $ 47.97万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2011410&HistoricalAwards=false
• 关键词: Mechanochemistry; Silicate; Glass; Surface; Mixed

NON-TECHNICAL DESCRIPTION: Silicate glasses are vital in high-tech optical industries and as commodity materials such as windows, containers, and fibers. This research is to advance mechanistic knowledge of how silicate glass surfaces are damaged by frictional contacts in ambient conditions. The impact of physical scratches or cracks on practical strengths of glass objects has been studied extensively and is relatively well understood; but in the case of chemical or optically-invisible mechanical defects made by frictional contacts under low load conditions, their impacts are far less understood for glass surfaces. Scientific breakthroughs in elucidating the impact of interfacial friction on mechanical and mechanochemical properties of silicate glasses can enable transformative growth in glass technologies. Today, researchers with surface science expertise are in high demand in glass manufacturing industries. The project team includes diverse students (at the undergraduate and graduate levels) and a postdoctoral scholar, and collaborates with on-campus organizations. TECHNICAL DETAILS: The damage to the glass by contact of foreign objects is typically studied by measuring hardness, fracture toughness, or cracking load/probability under high contact pressures applied with relatively sharp indenters. Although such studies can provide physical insights into mechanical responses of glass under extreme contact pressure conditions, they cannot explain the damage modes resulting from interfacial friction by a smooth and blunt object under a mechanical load far below the indentation damage threshold. Understanding the interplay between intrinsic factors (such as composition and thermal history of glass) and extrinsic parameters (such as water molecules adsorbed from surroundings) in friction-induced surface damage modes is important. The specific hypotheses being studied are: (a) friction-induced subsurface damage can occur at a contact stress far below indentation damage threshold and (b) the mechanochemical wear of soda lime silicate glass is governed not only by Na ions but by the interplay of mixed modifier ions (sodium and calcium) in the presence of adsorbed water molecules. The latter is a new type of mixed modifier effect that has not been examined extensively in glass science. These hypotheses are studied through carefully designed control experiments and reactive molecular dynamics simulations. The relaxation of subsurface damages and the interplay with other divalent ions (such as magnesium) hold interest to this project. Overall, a better understanding of parameters governing contact-induced surface damage processes can lead to better glass design for improved usable mechanical strength of silicate glass materials and well as high-quality optics with low sub-surface damage and good surface quality. The research motivation and outcome are integrated into a graduate course where the graduate student and postdoctoral researchers serve as guest lecturers.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术描述：硅酸盐玻璃在高科技光学工业中以及作为商品材料如窗户、容器和纤维中至关重要。这项研究是推进硅酸盐玻璃表面在环境条件下的摩擦接触损坏的机理知识。物理划痕或裂纹对玻璃物体实际强度的影响已被广泛研究，并且相对较好地理解;但在低负载条件下由摩擦接触造成的化学或光学不可见机械缺陷的情况下，它们对玻璃表面的影响远未被理解。在阐明界面摩擦对硅酸盐玻璃的机械和机械化学性质的影响方面的科学突破可以使玻璃技术实现变革性增长。如今，玻璃制造行业对具有表面科学专业知识的研究人员的需求量很大。该项目团队包括不同的学生（在本科和研究生水平）和博士后学者，并与校园组织合作。技术规格：通常通过测量硬度、断裂韧性或在相对尖锐的压头施加的高接触压力下的破裂载荷/概率来研究异物接触对玻璃的损坏。虽然这样的研究可以提供物理见解玻璃的机械响应在极端的接触压力条件下，他们不能解释的破坏模式，由界面摩擦下的机械载荷远低于压痕损伤阈值的光滑和钝的物体。了解摩擦引起的表面损伤模式中内在因素（如玻璃的成分和热历史）和外在参数（如从环境中吸附的水分子）之间的相互作用是很重要的。正在研究的具体假设是：（a）摩擦引起的亚表面损伤可以发生在接触应力远低于压痕损伤阈值和（B）的钠钙硅酸盐玻璃的机械化学磨损不仅由钠离子，但由混合改性剂离子（钠和钙）在吸附的水分子的存在下的相互作用。后者是一种新型的混合改性剂效应，在玻璃科学中尚未得到广泛研究。这些假设进行了研究，通过精心设计的控制实验和反应分子动力学模拟。亚表面损伤的松弛以及与其他二价离子（如镁）的相互作用对该项目很有意义。总体而言，更好地了解控制接触引起的表面损伤过程的参数可以导致更好的玻璃设计，以提高硅酸盐玻璃材料的可用机械强度，以及具有低亚表面损伤和良好表面质量的高质量光学器件。研究动机和成果被整合到研究生课程中，研究生和博士后研究人员担任客座讲师。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Field strength effect on elastoplastic behavior of aluminoborosilicate glass: II. Volumetric recovery

• DOI: 10.1111/jace.19152
• 发表时间: 2023-05-08
• 期刊: JOURNAL OF THE AMERICAN CERAMIC SOCIETY
• 影响因子: 3.9
• 作者: Fry，Aubrey L.;Ogrinc，Andrew L.;Mauro，John C.
• 通讯作者: Mauro，John C.

Vibrational spectroscopy analysis of silica and silicate glass networks

二氧化硅和硅酸盐玻璃网络的振动光谱分析

• DOI: 10.1111/jace.18206
• 发表时间: 2021
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: Liu, Hongshen;Kaya, Huseyin;Lin, Yen‐Ting;Ogrinc, Andrew;Kim, Seong H.
• 通讯作者: Kim, Seong H.

Flexural stress effect on mechanical and mechanochemical properties of soda lime silicate glass surface

• DOI: 10.1111/jace.18250
• 发表时间: 2021-11
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: Hongshen Liu;Hongtu He;Zhe Chen;Seong H. Kim

Field strength effect on structure, hardness, and crack resistance in single modifier aluminoborosilicate glasses

场强对单改性铝硼硅酸盐玻璃的结构、硬度和抗裂性的影响

• DOI: 10.1111/jace.18796
• 发表时间: 2022
• 期刊: Journal of the American Ceramic Society
• 影响因子: 3.9
• 作者: Fry, Aubrey L.;George, Christy;Slagle, Ian;Hawbaker, Harry;Feller, Steve;Kim, Seong H.;Mauro, John C.
• 通讯作者: Mauro, John C.

Subsurface structural change of silica upon nanoscale physical contact: Chemical plasticity beyond topographic elasticity

• DOI: 10.1016/j.actamat.2021.116694
• 发表时间: 2021-04
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: Hongtu He;Zhe Chen;Yen‐Ting Lin;S. Hahn;Jiaxin Yu;A. V. van Duin;T. Gokus;S. Rotkin;Seong H. Kim