Semiconductor Carbon Materials – Ultra‑High‑Purity Graphite, C/C Composites & Glassy Carbon for Thermal‑Field Management

Core Introduction

SemiXLab supplies ultra‑high‑purity carbon‑based materials for semiconductor thermal‑field management and high‑temperature structural components. The table below compares four core materials across density, purity, thermal conductivity, strength and other key properties to support rapid material selection. Impurity control is GDMS‑verified, with metallic impurities achievable at <0.1–2 ppm depending on grade.

Key Specifications

Parameter	Isostatic Graphite	Soft Felt	Rigid / Hard Felt	C/C Composite
Density (g/cm³)	1.75 – 1.90 (pref. ≥1.88)	0.08 – 0.15	0.15 – 0.30	1.40 – 1.70
Metal Impurity / Ash (GDMS)	<0.1 – 5 ppm (high‑purity grades)	<5 – 20 ppm (purified)	<5 – 20 ppm (purified)	<5 – 50 ppm (high‑purity)
Thermal Cond. (W/m·K)	80 – 150	0.10 – 0.30 (excellent insulation)	0.20 – 0.50	20 – 100+ (anisotropic)
Flexural Strength (MPa)	40 – 85	Very low (≈0.1–0.3)	0.5 – 2.5	100 – 300
CTE (×10⁻⁶/K)	3.5 – 5.5	<3.5	2.0 – 4.0	0.5 – 2.0 (fiber direction)
Max Service Temp.	>2000°C (inert/vacuum)	≈2000°C (inert/vacuum)	≈2000°C (inert/vacuum)	>2200°C (inert/vacuum)
Key Advantages	High density & purity, precision machining, isotropic	Ultra‑low thermal conductivity, flexible, large width	Self‑supporting, long life, easy forming	Ultra‑high specific strength, high‑temp dimensional stability, thermal‑shock resistance
Typical Applications	Heaters, crucibles, guide tubes, electrodes	Insulation layers, soft felt blankets	Insulation cylinders, rigid insulation assemblies	Crucibles, guide tubes, fasteners, structural supports

Selection Tips

Precision machining + high‑purity structural parts → Prefer high‑purity isostatic graphite
Ultimate insulation + flexible installation → Graphite soft felt
Self‑supporting long‑life insulation → Graphite hard/rigid felt
High‑strength high‑temperature structural parts → Carbon‑carbon (C/C) composite

Main Application Scenarios

CZ / FZ monocrystalline silicon puller thermal fields → Isostatic graphite + soft/hard felt combinations
SiC PVT crystal‑growth crucibles & insulation systems → Isostatic graphite / C/C crucibles + hard‑felt insulation
Ion‑implantation graphite components → High‑purity isostatic graphite
High‑purity SiC feedstock for crystal growth → Independent high‑purity chunk product