Quartz fiber is manufactured using high-purity quartz sand (with a SiO₂ content of ≥99.95%) as its raw material, through processes involving melting, drawing, surface treatment, and composite molding. 

It is a specialized inorganic fiber material characterized by a unique combination of properties: high-temperature resistance, low dielectric loss, superior electrical insulation, and excellent thermal shock resistance. Its continuous service temperature reaches up to 1200°C, with short-term peak temperature resistance exceeding 1600°C;

 its dielectric constant remains stable at 3.7±0.1, its dielectric loss tangent (tanδ) is less than 0.001, and its coefficient of thermal expansion is as low as 0.5×10⁻⁶/°C. Consequently, it holds an irreplaceable status in the fields of extreme environments and high-end equipment.

Quartz Fiber Manufacturing Process: Precise Control of Thermal Processing Stages

The production of quartz fibers involves six core stages: raw material purification, melt drawing, fiber pretreatment, surface modification, composite molding, and post-processing.

1. Quartz Fiber Raw Material Purification and Melt Drawing: Establishing a Solid Foundation for Performance

During the raw material purification stage, the content of impurities—such as Fe₂O₃ and Al₂O₃—within the quartz sand must be controlled to below 50 ppm to prevent these impurities from compromising the fiber's high-temperature resistance and electrical insulation properties. 

The melt drawing process utilizes either the crucible method or the blow-spinning method; the purified quartz sand is melted into a liquid state within a high-temperature furnace exceeding 2000°C, then drawn at high speed through a spinneret (reaching drawing speeds of 1000–1500 m/min) to form continuous fiber bundles with diameters ranging from 3 to 15 μm.

2. Core Thermal Processing Steps for Quartz Fiber: Precise Temperature Control Determines Performance Limits

The fiber pretreatment stage centers on preheating, drying, and surface activation. This involves subjecting the fiber bundles to heat treatment within a temperature range of 280–350°C. 

The objective is to remove adsorbed moisture from the fiber surface (reducing the moisture content to below 0.05%) while simultaneously enhancing the fiber's surface activity, thereby laying a solid foundation for subsequent surface modification and resin composite processing.

The composite molding stage is critical to the transformation of quartz fibers into high-end materials; depending on the specific application scenario, the quartz fibers must be composited with materials such as epoxy resins, polyimides, or ceramic matrices.

The post-processing stage primarily involves surface calendering and curing/setting. By utilizing specialized calenders and customized heating rollers, the surface flatness of the composite material is further enhanced (surface roughness Ra < 0.8 μm); simultaneously, precise curing control ensures the material's dimensional stability (dimensional deviation < 0.1%).

Core Application Domains of Quartz Fiber: Deep Penetration into High-End Sectors-Truly Irreplaceable

Leveraging its exceptional comprehensive performance, quartz fiber has deeply penetrated four core domains: aerospace, electronics and information technology, high-temperature industrial sectors, and medical and environmental protection. 

It occupies an irreplaceable position within high-end equipment manufacturing and specialized application scenarios, while the continuous expansion of its application landscape simultaneously drives the iterative upgrading of its manufacturing processes.