Heraeus Unleashes Pressureless Silver Sintering Pastes to Propel High-Power SiC Modules in EV Inverters

Heraeus Electronics News Germany

Overview

Heraeus has introduced two advanced silver sintering pastes designed to revolutionize die attachment for high-power Silicon Carbide (SiC) modules, particularly within electric vehicle (EV) inverters. These novel formulations enable pressureless sintering, dramatically enhancing thermal conductivity and power cycling reliability, which translates to extended device lifespan and more efficient, robust performance critical for demanding automotive applications. The innovation significantly streamlines manufacturing for mass production.

In Depth

Background

With the rapid expansion of the electric vehicle market, Silicon Carbide (SiC) power modules are emerging as indispensable components in EV inverters and charging infrastructure. Their inherent advantages – high efficiency, high-frequency operation, and superior high-temperature resistance – make them ideal for the rigorous demands of automotive electrification. However, fully harnessing the immense potential of SiC devices has been critically dependent on the evolution of supporting bonding materials. Heraeus’ latest product offerings directly address this crucial material science gap, thereby accelerating the widespread adoption of SiC technology in the automotive industry and paving the way for next-generation EVs demanding higher power and voltage capabilities.

Key Innovations

Heraeus has unveiled two groundbreaking silver sintering pastes specifically engineered for robust die attachment in high-power SiC modules used in electric vehicle (EV) inverters. These advanced materials represent a significant leap forward, facilitating pressureless sintering while achieving substantially higher thermal conductivity compared to conventional bonding techniques. The outcome is a drastic extension of device lifespan and a profound enhancement in power cycling reliability, even under the most severe automotive operating conditions.

Technical Deep Dive

• Pressureless Sintering: Traditional sintering processes, often requiring high applied pressure, introduce considerable equipment costs and complexities into manufacturing workflows. Heraeus’ newly developed pastes exhibit exceptional sintering performance without the need for external pressure, fundamentally simplifying the production process and directly contributing to cost reduction. This innovation significantly improves the manufacturability and scalability of SiC power modules, crucial for high-volume mass production.
• Superior Thermal Conductivity: While SiC power devices offer unparalleled efficiency, they generate considerable heat during operation, which must be effectively managed. These silver sintering pastes boast superior thermal conductivity (while specific numerical values are proprietary, they demonstrate a significant improvement over conventional materials), enabling highly efficient heat transfer from the SiC chip to the heatsink. This superior thermal management capability effectively mitigates device temperature rise, directly translating to enhanced stable performance and long-term reliability.
• Enhanced Power Cycling Reliability: EV inverters are routinely subjected to rapid and extreme temperature fluctuations alongside dynamic current changes, demanding exceptional power cycling reliability from die-attach materials. Heraeus’ new pastes significantly bolster resistance to these severe conditions through optimized stress-relieving properties and outstanding adhesion strength. This robust performance extends device longevity, a critical factor for automotive applications.

Strategic Significance & Outlook

Through the introduction of these advanced silver sintering pastes, Heraeus aims to further catalyze the growth of the EV market and accelerate the widespread adoption of SiC power modules. The company is committed to continuous innovation, planning to develop even higher-performance materials and explore potential application expansion into other high-power electronic device fields. This includes critical sectors such as renewable energy systems and industrial power supplies. This pioneering technology represents a pivotal step towards achieving greater power conversion efficiency, thereby making a substantial contribution to the realization of a more sustainable and electrified society.

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