Kunshan Meiyaxing Hardware & Machinery Co., Ltd. is a direct subsidiary of Hong Kong Meiya International Trading Company and specializes in the wholesale of CNC cutting tools. We are dedicated to providing high-quality CNC cutting tool products and professional services to meet the production and machining needs of customers across various industries. Through long-term strategic partnerships with renowned domestic manufacturers, we have secured excellent procurement channels and offer a comprehensive product line with diverse specifications; our extensive inventory of CNC tools caters to a wide range of production and machining requirements. Furthermore, we continuously introduce new products to address the evolving needs of our customers. Our service team possesses professional technical expertise and delivers exceptional after-sales support, offering comprehensive services-including technical assistance, installation, commissioning, and maintenance-to ensure an optimal user experience. We also provide customized tooling solutions tailored to specific customer requirements, guaranteeing the best possible service and experience for every client. Moving forward, we remain committed to our business philosophy of 'Quality First, Service Foremost,' continuously enhancing our service standards and product quality to create greater value and foster success for our customers.
Cermet is a composite material formed through powder metallurgy, combining a ceramic phase (such as TiC, TiN, Al₂O₃, etc.) with a metallic phase (such as Ni, Co, Mo, etc.). It possesses the high hardness, heat resistance, and wear resistance characteristic of ceramics, alongside the toughness, electrical conductivity, and thermal conductivity of metals, making it widely applicable in fields such as cutting tools, aerospace, and electronic components. However, the performance of cermet depends heavily on its operational stability and the precise timing of its application. This article analyzes these two core issues.
II. Operational Stability of Cermet
2.1 Definition of Stability
Operational stability refers to the ability of cermet to maintain its performance without significant degradation under specific operating conditions. Key aspects include:
· Thermal stability: Resistance to softening, oxidation, and phase transformation at high temperatures;
· Chemical stability: Resistance to chemical reactions with the workpiece material or environmental media;
· Mechanical stability: Ability to maintain strength and hardness under cyclic and impact loads;
·" Microstructural stability: The ability to resist grain growth, phase decomposition, or interfacial debonding during long-term use.
2.2 Key factors affecting stability
(1) Composition design
The ratio of ceramic phases to metallic phases directly determines the balance of properties. Excessive ceramic content increases hardness but reduces toughness, making the material prone to edge chipping; conversely, excessive metallic content improves toughness but lowers wear resistance. For TiC-Ni systems, the Ni content is typically best maintained between 10% and 20%.
(2) Interfacial bonding state
The wettability and bonding strength at the ceramic-metal interface form the microstructural basis for stability. Additions such as Mo or Mo₂C can improve wettability and reduce interfacial defects, thereby enhancing thermal shock and fatigue resistance.
(3) Fabrication process
Sintering temperature, holding time, and atmosphere control influence material density and grain size. Hot Isostatic Pressing (HIP) can eliminate internal porosity, significantly improving microstructural uniformity and stability.
(4) Operating environment
High-temperature oxidation, corrosion from cutting fluids, and impact loads during interrupted cutting accelerate performance degradation. For instance, TiC-based cermets experience intensified oxidation above 600°C, necessitating control of the operating temperature.
2.3 Methods to enhance stability
· Optimize composition ratios and introduce multi-component ceramic phases such as TiN and TaC;
· Employ a functionally graded structure design, featuring high surface hardness and high internal toughness;
· Apply surface coatings (e.g., TiAlN, Al₂O₃) to inhibit oxidation and diffusion;
· Strictly control sintering and post-processing procedures to minimize residual stress.
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