Breakthrough in Technical Bottlenecks: Pressureless Sintered Silicon Carbide Ceramics Usher in New Progress for Mass Production

A type of advanced ceramic material possessing exceptional properties such as high strength, high Wear Resistance, high-temperature resistance, and corrosion resistance is transitioning from the laboratory to industrialization, offering potential for transformation across numerous industrial sectors.

Recently, the technical renovation project for an annual production line of 600 tons of pressureless sintered silicon Carbide Ceramics, invested in and constructed by Zhejiang Jingtao Technology Co., Ltd., has smoothly entered the trial production phase. This progress marks a significant breakthrough in the mass production of pressureless sintered silicon carbide ceramics.

01 What is Pressureless Sintered Silicon Carbide Ceramic?

Pressureless sintered silicon carbide ceramic is a ceramic material primarily composed of high-purity, ultra-fine silicon carbide powder, with sintering additives like boron carbide or graphene added. It is sintered in an inert gas or vacuum environment at temperatures between 1950~2100°C.

Unlike traditional sintering processes that require applied pressure, pressureless sintering technology achieves near-complete densification of the product under atmospheric pressure conditions.

This method offers lower production costs and is more suitable for manufacturing components with complex shapes.

Pressureless sintered silicon carbide ceramics exhibit characteristics such as high strength, high wear resistance, high-temperature resistance, corrosion resistance, and resistance to acids and alkalis, allowing for long-term use in various harsh environments.

Its solid-phase sintered products achieve purity up to 98% of the theoretical density, combining high thermal conductivity, excellent high-temperature strength, and mechanical properties.

02 Technical Bottlenecks and Breakthroughs

Although pressureless sintered silicon carbide ceramics offer excellent performance, their manufacturing process has consistently faced challenges.

The extremely high hardness and significant brittleness of silicon carbide ceramic make it difficult to manufacture complex structural components using traditional processing methods. This technical bottleneck has severely restricted its application in high-end equipment.
This process effectively inhibits sintering shrinkage through the formation of a SiC skeleton during precursor conversion, dramatically reducing the linear shrinkage rate from 21.71% to 6.38%.

The final prepared SiC ceramic achieved a density of 3.17 g·cm⁻³, a flexural strength of 359 MPa, an elastic modulus of 381 GPa, and a thermal conductivity as high as 165.76 W·m⁻¹·K⁻¹.

03 Wide Range of Application Fields

Due to their excellent properties, pressureless sintered silicon carbide ceramics have shown broad application prospects in multiple fields.

In the semiconductor manufacturing sector, silicon carbide ceramics are primarily used for moving parts such as wafer stages, guides, ceramic chucks, and arms in lithography machines. Their high rigidity and low coefficient of thermal expansion ensure stable operation of the equipment under nanometer-level motion precision.

In the new energy photovoltaic field, silicon carbide ceramics are replacing traditional quartz materials for carrier components like boat supports in diffusion furnaces and LPCVD equipment, potentially increasing service life by more than 5 times.

Pressureless sintered silicon carbide ceramics are also suitable for seals, bearings, ballistic armor, and other fields.

Their hardness and fracture toughness directly determine the performance of ballistic protection. Enhancing sintering densification and employing multi-phase composite sintering are key methods to improve the hardness and fracture toughness of pressureless sintered silicon carbide ceramics.

In extreme environments involving high temperatures, high pressure, strong corrosion, and high wear within industries such as chemical engineering, pharmaceuticals, and metallurgy, pressureless sintered silicon carbide ceramics can serve as high-quality substitutes for traditional materials like graphite, stainless steel, and tantalum metal.

04 Market Prospects and Industrialization Progress

As the technology for pressureless sintered silicon carbide ceramics continues to mature, its market scale is gradually expanding.

Current research and development are focusing on improving sintering additives and developing composite materials to meet the needs of emerging fields like new energy vehicles and 5G communication.

Breakthroughs in pressureless sintered silicon carbide ceramic technology are bringing new possibilities to high-end manufacturing.

From semiconductor equipment to new energy sectors, from chemical corrosion protection to ballistic protection, this high-performance material is gradually becoming a key alternative to traditional materials, leveraging its unique advantages.