Description

Tungsten Wire Mesh Screens for High-Temperature Heating Elements

Ultra-High Purity W & W-Alloy Meshes for Vacuum Furnaces, Semiconductor & Aerospace Applications

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Material Grades & Composition

Grade	Composition	Key Additives	International Standards
Pure W (W-1)	W ≥99.95%	–	ASTM B760, AMS 7725, DIN 17850
W-ThO2 (W-2)	W 97.5–98.5%, ThO2 1.5–2.0%	Thorium Oxide Dispersion	MIL-T-21014, AMS 7726
W-La2O3	W 97–98%, La2O3 2–3%	Lanthanum Oxide Reinforcement	ASTM F288, GB/T 4189-2017
W-Re	W 95–97%, Re 3–5%	Rhenium Alloying	AMS 7727, GOST 18904-2020
W-Mo	W 70–90%, Mo 10–30%	Molybdenum Solid Solution	AMS 7728, JIS H 4461

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Critical Property Comparison

Property	Pure W	W-ThO2	W-La2O3	W-Re	W-Mo
Melting Point	3422°C (6192°F)	3400°C (6152°F)	3410°C (6170°F)	3380°C (6116°F)	2900–3100°C (5252–5612°F)
Operating Temp (Vacuum)	≤2800°C (5072°F)	≤3000°C (5432°F)	≤2900°C (5252°F)	≤3200°C (5792°F)	≤2500°C (4532°F)
Thermal Conductivity	173 W/m·K	165 W/m·K	170 W/m·K	155 W/m·K	120–140 W/m·K
Resistivity (20°C)	5.6 μΩ·cm	6.2 μΩ·cm	5.8 μΩ·cm	7.0 μΩ·cm	8.5–10 μΩ·cm
Creep Resistance	Moderate	Excellent	High	Extreme	Good
Electron Emission	Low	Excellent	High	Moderate	Low
Oxidation Resistance	Poor (requires inert atmosphere)	Poor	Poor	Moderate (Re slows oxidation)	Better (Mo protective layer)

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Application-Specific Advantages

1. Pure Tungsten Mesh (W-1)

• Vacuum Annealing Furnaces: Operates continuously at 2600°C (4712°F) under H₂/Ar atmospheres for 5,000+ hours with <10% grain growth.
• Single Crystal Silicon Growth: Low contamination (Ta/WC coating) compliant with SEMI F47 standards.

2. W-ThO2 Mesh

• Aerospace Heaters: 300% improved thermal shock resistance for rocket engine ignition systems (NASA-STD-6012 certified).
• Electron Beam Melting: ThO2 enhances electron emission efficiency, achieving 50 kW/m² power density.

3. W-La2O3 Mesh

• Photovoltaic Diffusion Furnaces: La2O3 inhibits W-C reactions in POCl3 environments, extending service life to 2+ years.
• Nuclear Fusion Devices: Validated neutron irradiation stability (ITER project approved).

4. W-Re Alloy Mesh

• CVD Diamond Deposition: Re improves ductility, resisting thermal fatigue >10⁵ cycles (1,300°C rapid cooling).
• High-Temp Sintering Fixtures: Short-term load-bearing at 3,200°C (SiC sintering support).

5. W-Mo Hybrid Mesh

• Gradient Heaters: Matched CTE (W-30%Mo: 5.5×10⁻⁶/°C) minimizes thermal stress.
• Cost-Effective Alternative: 40% lower cost than pure W, ideal for industrial furnaces ≤2200°C (3992°F).

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Technical Specifications

Parameter	Standard Range	Custom Options
Wire Diameter	0.05 mm – 1.0 mm	Ultra-fine wires: 0.02 mm (laser-drawn)
Mesh Count	10–400 mesh	3D woven structures (multi-layer)
Purity	99.95% – 99.999%	Zone-refined tungsten (99.9995%)
Surface Finish	Electro-polished (Ra ≤0.2 μm)	CVD coatings (SiC, HfC anti-oxidation)
Sheet Size	1000×500 mm (standard)	Coils (max width 1200 mm)

 

FAQ Section

Q1: How to prevent tungsten mesh oxidation in air?
A: Operate in vacuum/inert atmospheres or apply HfC/SiC coatings (oxidation-resistant up to 1800°C/3272°F).

Q2: Is W-ThO2 RoHS compliant?
A: Th is radioactive. We offer W-La2O3 as an eco-friendly alternative with equivalent performance.

Q3: Minimum bending radius?
A: 3–5× wire diameter (e.g., 0.1 mm wire bends to R0.3 mm). Post-bending annealing recommended.

Q4: How to select mesh count for power density?

• Low mesh (10–40): High power (50–100 W/cm²), rapid heating.
• High mesh (200–400): Uniform heating (±5°C), ideal for precision annealing.