When power electronic equipment disconnects a circuit, a high-temperature arc is generated when the gap voltage and breaking current reach a critical value. The instantaneous high temperature from the arc continuously erodes the metal contact surface, causing material melting and migration, surface ablation, and a continuous increase in circuit contact resistance. In severe cases, this can lead to equipment failure or even fire. Tungsten Copper Vacuum Contacts, relying on a two-phase composite metal structure, weaken the destructive effect of the arc from the material's underlying properties, making them a core contact component for vacuum arc extinguishing, new energy electrical control, and vehicle high-voltage control equipment. The ultra-high melting point and low evaporation rate of tungsten metal, combined with the excellent electrical and thermal conductivity of electrolytic copper, complement each other to solve the engineering challenge of single-metal materials not being able to simultaneously achieve arc resistance and conductivity.
The long-term operational stability of circuit contact components is constrained by four core conditions: material formulation, load current, breaking frequency, and cavity environment. Ordinary single-layer metal contacts are difficult to adapt to the long-term operating conditions of vacuum-sealed cavities. Copper Tungsten Contacts are formed using a powder metallurgy solid-phase diffusion process, resulting in a tight, seamless interlocking two-phase metal structure. After high-temperature degassing, the internal porosity is extremely low, preventing the release of impurities and gas contamination of the cavity in a sealed vacuum environment. This ensures stable operation of the vacuum chamber and makes it suitable for high-frequency switching devices such as AC contactors, vacuum relays, and energy storage converters.
Electric arcs are a primary cause of damage to contact components. At the moment of disconnection, the arc temperature can reach thousands of degrees Celsius. Ordinary metal contact surfaces melt rapidly, splattering and accumulating, leading to weld adhesion after multiple cycles, directly causing equipment jamming and inability to switch on or off normally. Tungsten Copper Button Contacts feature an internal tungsten phase forming a three-dimensional support framework that locks in the molten copper matrix, significantly reducing metal migration losses and minimising defects such as pitting and protrusions on the contact surface. After millions of switching durability tests, the fluctuation range of the component's contact resistance is controlled to an extremely small range, significantly extending the replacement cycle of the entire equipment and reducing the overall lifecycle maintenance costs.
Pure tungsten has poor electrical and thermal conductivity, making it prone to localised overheating under high-current conditions. Pure copper lacks high-temperature resistance, and even short-term arc erosion can cause severe damage. Both materials have significant engineering limitations when used alone. Electric Horn Tungsten Contacts allow for adjustments to the tungsten-copper ratio based on actual equipment operating conditions. High-tungsten ratio models are suitable for high-voltage, high-arc breaking scenarios, while medium-tungsten ratio models balance mechanical shock resistance and conductivity, meeting diverse application needs such as automotive electrical control and industrial vacuum switches. Replacement can be achieved without requiring equipment manufacturers to readjust the base structure.
Vacuum conditions impose stringent requirements on the gas release parameters of contact components. Raw material impurities and internal pores continuously release gas, gradually compromising the vacuum level of the cavity, causing ageing of insulating components and degradation of breaking performance. The entire production process of Half Hollow Tungsten Contact Rivets includes powder purification, vacuum high-temperature sintering, and multiple degassing processes. The gas release of the finished product is far below industry-standard limits, allowing for long-term stable operation within a sealed vacuum cavity. Meanwhile, the component surface undergoes mirror passivation treatment, which reduces initial contact resistance and prevents oxide layer formation during storage and assembly, ensuring long-term conductivity consistency.
Automated batch assembly scenarios have high requirements for component dimensional consistency and mechanical pressure resistance. Brazed composite contact components are prone to interface cracking and delamination under pressure, making them unsuitable for fully automated riveting production lines. Tungsten Contact Point Rivets can process various shapes and structures, such as solid rivets, semi-hollow rivets, and stepped buttons, with standardised dimensional tolerances. The stepped limiting structure can distribute riveting pressure and prevent micro-cracks from forming in the composite layer under pressure. Components in the same batch have good interchangeability, significantly reducing the frequency of tooling debugging on automated production lines and improving the assembly production efficiency of end manufacturers.
In overall power electronic equipment failures, contact component wear and tear accounts for a high proportion. Traditional contact components, limited by materials and processes, find it difficult to simultaneously meet the multiple complex operating conditions of extremely high and low temperatures, high-frequency impacts, and vacuum sealing. Tungsten Copper Electrical Contacts, with their balanced thermal, electrical, and mechanical properties, cover mainstream applications in new energy storage, vehicle electrical control systems, and high-voltage vacuum power distribution equipment. Relying on stable material properties and a standardised manufacturing system, they avoid common engineering pain points such as arc erosion, welding defects, and vacuum chamber contamination from the source, making them key structural components for the long-term reliable operation of high-power power electronic equipment.
Most composite contacts on the market suffer from poor interface bonding, excessive outgassing, and batch performance fluctuations, making them difficult to adapt to complex high-voltage vacuum conditions in the long term. Our self-developed and mass-produced Tungsten Copper Rivet Electrical Contacts utilise a high-purity powder solid-phase diffusion sintering process, supporting customised formulations and structures. Full-process physicochemical testing ensures batch consistency, perfectly solving common equipment problems such as arc erosion, vacuum chamber contamination, and frequent welding defects.
Engineering Connection Invitation: If you require customised Tungsten Copper Vacuum Contacts to match your equipment's operating conditions, please provide parameters such as voltage, current, and vacuum environment, along with assembly drawings. Our R&D team will immediately provide a complete material compatibility solution and samples.
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