SBIR Phase II: Chemical Vapor Deposition-SiC Coated Ceramic Valve Components of High Damage and Wear Resistance

SBIR第二期：化学气相沉积-SiC涂层高损伤和耐磨陶瓷阀元件

• 批准号: 9800946
• 负责人: Jan-Fong Jue
• 金额: $ 40万
• 依托单位: MATERIALS & SYSTEMS RESEARCH INC
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9800946&HistoricalAwards=false
• 关键词: SBIR; Phase; II; Chemical; Vapor

*** 9800946 Jue This Small Business Innovation Research Phase II project will demonstrate significant improvements in resistance to corrosion, erosion and fracture and service lifetimes for valves with the graded silicon carbide (SiC) components to be developed relative to the valves with sintered alpha-SiC components. SiC is a low-cost ceramic that possesses high hardness, good sliding wear resistance, and excellent corrosion and oxidation resistance. Because of these attributes it is used as mechanical face seals for water pumps in automobiles and as balls and seats in shut-off valves. SiC, however, has a low fracture toughness that renders it susceptible to fracture under impact and thermal-shock conditions and to surface damage and erosion in particle impact. During Phase I, the feasibility of toughening SiC was demonstrated. The approach used consisted of designing and fabricating a functionally-graded material where the outer layer was 'pure' beta-SiC deposited by chemical-vapor deposition (CVD) on a substrate made of liquid-phase sintered SiC-TiC particulate composite. The designed composition and thermal-expansion mismatch led to a residual surface compression in the CVD-SiC coating on cooling from the deposition temperature. Coating compressions as high as 1.1 GPa were developed by this approach depending on the substrate composition, coating thickness, and the geometry of the component. Surface compression in the graded-SiC increased rolling-contact-fatigue life by greater than a factor of 100. The Phase II research will apply this technology to balls and seats in a 1.5 in. ball valve manufactured and marketed by Valtek International, the Phase III partner. Development of a ceramic manufacturing process for making SiC-TiC balls and seats, optimization of a rapid chemical-vapor deposition/composite vapor coating (CVD/CVC) coating process, low-cost surface finishing and prototype and field testing of the valve components are the major tasks in the proposed research. Th e Phase II research project is aimed at introducing surface-compression-toughened SiC in ceramic ball valves. These valves accounted for $ 8 million in sales in North America in 1996. The technology can also be implemented in the ceramic bearing and the automobile industries , e.g., cam followers. ***

*** 9800946 JUE这个小型企业创新研究阶段II项目将显示出对阀门的耐腐蚀，侵蚀，骨折和服务寿命的显着改善，该阀门具有分级的碳化硅（SIC）组件，该组件相对于阀门均可开发的阀SIC组件。 SIC是一种低成本的陶瓷，具有高硬度，良好的滑动耐磨性以及出色的腐蚀和抗氧化性。 由于这些属性，它被用作汽车中的水泵的机械面盖，并用作关闭阀中的球和座椅。 然而，SIC具有低断裂韧性，使其在撞击和热震条件下易受骨折的骨折以及颗粒撞击的表面损伤和侵蚀。 在第一阶段，证明了加强SIC的可行性。 所使用的方法包括设计和制造功能分级的材料，其中外层是通过化学蒸气沉积（CVD）沉积在由液相烧结SIC-TIC颗粒复合材料制成的底物上的“纯”β-SIC。设计的组合物和热曝光不匹配导致CVD-SIC涂层的残留表面压缩，从沉积温度冷却。 该方法根据底物组成，涂层厚度和组件的几何形状而开发了高至1.1 GPA的涂料压缩。 分级-SIC中的表面压缩增加了滚动 - 接触效率的寿命大于100倍。第二阶段研究将将这项技术应用于1.5英寸的球和座位。 III合作伙伴。 开发用于制造SIC-TIC球和座椅的陶瓷制造过程，优化快速的化学蒸气沉积/复合蒸气涂层（CVD/CVC）涂料过程，低成本表面修饰以及阀门组件的原型和现场测试是拟议研究的主要任务。 第二阶段研究项目旨在在陶瓷球阀中引入表面压缩的SIC。 这些阀门在1996年在北美占800万美元的销售额。该技术也可以在陶瓷轴承和汽车行业（例如CAM关注者）中实施。 ***