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A Convergence Study to Determine to the Role of Pressure Solution Creep Mechanisms in Driving Cold Sintering in Functional Ceramics

确定压溶蠕变机制在驱动功能陶瓷冷烧结中的作用的收敛性研究

基本信息

批准号：
2202525
负责人：
Clive Randall
金额：
$ 70万
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：
2022
资助国家：
美国
起止时间：
2022-09-01 至 2026-08-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2202525&HistoricalAwards=false
关键词：
Convergence Study Determine Role Pressure

项目摘要

Non-Technical SummaryCold sintering is a recently introduced processing technique that has been demonstrated to be applicable to sintering a broad number of ceramic and ceramic composites. The temperatures that drive densification are an order of magnitude lower than the conventional thermal processes that are used in ceramic manufacturing across the world. The mechanisms enabling these extremely low temperatures use a mechano-chemical process with the use of a transient chemical phase. This investigation considers the theories and geophysical science that drive the formation of sedimentary rock and looks to test its relevance to the cold sintering process that are now being applied to the fabrication of advanced ceramic materials. Through understanding these processes, a broader impact is considered for cold sintering of architectural bricks and tiles. Through a partnership with the United Nations Global Buildings Network and the African MRS, demonstration and education of the cold sintering processes for local brick making in rural areas in Africa will be made. Undergraduate researchers will be involved in this engineering aspect of the project.Technical SummarySedimentary rock densifies over many years with a process known as pressure solution creep. This process involves pressure induced dissolution, transport, and precipitation. Cold sintering is a relatively new introduction to a sustainable manufacturing process. This study will embrace the non-equilibrium geophysics of rock formation and correlate the densification and grain growth process of conventional sintering. Conventional sintering is a process that thermodynamically drives the minimization of excess surface energy at temperatures an order of magnitude higher than the cold sintering process. The proposed study here will experimentally and theoretically test the understanding of the geophysics of the pressure solution creep and consider its applicability to understanding the densification kinetics to cold sintering. There are various sequential processes that enable the low temperature densification including chemo-mechanical dissolution, grain boundary dissolution and precipitation and of which can be the rate limiting step. The proposed study will access these phenomena in model systems to better understand the cold sintering process from a new fundamental perspective and converging material science and geoscience. From a broader impact perspective an investigation will use the cold sintering process to the application of brick formation in rural areas of Africa. This will involve a partnership with both the Global Building Network and the African Materials Research Society.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.

非技术概述冷烧结是最近引入的加工技术，其已被证明适用于烧结大量陶瓷和陶瓷复合材料。驱动致密化的温度比世界各地陶瓷制造中使用的传统热工艺低一个数量级。实现这些极低温度的机制使用机械化学过程，并使用瞬态化学相。这项调查考虑了推动沉积岩形成的理论和地球物理科学，并试图测试其与目前应用于先进陶瓷材料制造的冷烧结工艺的相关性。通过对这些工艺的理解，对建筑砖瓦的冷烧结产生了更广泛的影响。通过与联合国全球建筑物网络和非洲MRS的伙伴关系，将在非洲农村地区进行当地制砖冷烧结工艺的示范和教育。本科研究人员将参与该项目的工程方面。技术摘要沉积岩多年来通过一个称为压力溶解蠕变的过程而致密化。该过程涉及压力诱导的溶解、迁移和沉淀。冷烧结是一种相对较新的可持续制造工艺。这项研究将包括岩石形成的非平衡地球物理学，并与常规烧结的致密化和晶粒生长过程相关联。常规烧结是在比冷烧结工艺高一个数量级的温度下以摩擦方式驱动过量表面能最小化的工艺。这里提出的研究将在实验和理论上测试的压力溶液蠕变的物理学的理解，并考虑其适用性，以了解致密化动力学冷烧结。存在能够实现低温致密化的各种顺序过程，包括化学机械溶解、晶界溶解和沉淀，并且其可以是速率限制步骤。拟议的研究将在模型系统中访问这些现象，以便从一个新的基本观点和融合材料科学和地球科学的角度更好地理解冷烧结过程。从更广泛的影响角度来看，调查将使用冷烧结工艺在非洲农村地区的砖形成的应用。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。