Vacuum chamber infrared heater

Thu, 23 Jul 2026 12:15:31 +0800

Why Gold is a Must for Your Vacuum IR Heaters

If you’re heating silicon wafers in a vacuum, you’ve probably noticed that the usual rules don’t apply. There’s no air to move the heat around, so convection is out of the picture. You’re relying entirely on radiation. Here’s the problem: if you’re using a standard polished aluminum or stainless steel reflector, you’re basically throwing money away. A huge chunk of your power just vanishes into the housing instead of hitting the wafer. That’s why we go with gold. The magic of gold reflectivity It sounds flashy, but there’s a practical reason for it. In the infrared spectrum, gold is a beast—it reflects over 98% of that radiant energy. By putting a thin layer of gold on the reflector housing, we make sure those photons actually go where they’re supposed to: straight onto the wafer. It tightens up your heat profile and gets your ramp-up times down. It’s just more efficient. Saving your hardware from the heat To get a wafer up to temperature, you need high-wattage lamps. But that much power creates a real risk. Without that gold coating, the reflector housing absorbs all the stray radiation. Before you know it, the housing is overheating, which can warp your chamber or ruin your vacuum seals. That’s a nightmare to fix. Gold keeps the heat moving toward the target and away from your machine frame. The honest trade-offs Look, gold isn’t cheap. The upfront cost is definitely higher than aluminum. And you have to be careful with how you handle it. If your team decides to scrub the reflectors with abrasive pads during maintenance, they’ll strip that gold layer right off. Once that happens, your efficiency tanks. I usually suggest checking the coating every 1,000 hours. Keep an eye out for pitting or discoloration. If you start seeing those signs, your wafers won’t hit their target temperature. The weird part? Your power meters will still show the same wattage, but the wafer surface will just lag behind. It’s a sneaky way for your performance to slip.

Vacuum compatible infrared heater

Wed, 03 Jun 2026 12:33:54 +0800

On the lithography floor, you know how it goes: a half-degree drift in bake temperature and your CD starts to wander. One particle, and you’re scrapping more than just a wafer. You run soft bake and hard bake back-to-back, then clean and dry—each step carries the thermal budget forward. If the heater starts underperforming, yield slips before metrology even flags it. What we focused on, technically We built a vacuum-compatible infrared heater around short-wave NIR elements and quartz optics, so energy hits the wafer directly and fast. Across the chuck, wafer-level uniformity stays within ±0.1°C, and repeatability is held by closed-loop control with a calibrated sensor traceable to NIST. The chamber interface takes CF/ISO-K flanges, and the body is built for Class 1–100 cleanroom use, with zero particle generation verified by in-situ particle counting. Power density is tuned to match photoresist bake profiles, and the thermal response is quick enough to track recipe steps without overshoot. Why it plays in fab In practice, your soft bake and hard bake profiles land the same way lot after lot, which trims CD variation on critical layers. Because the heat is localized and fast, you avoid heating the whole chamber, so energy use drops. And the output stays clean and dry, keeping contamination out of the process. Uptime is the real scorecard: units have run 5,000+ hours with less than 5% output drop, which means fewer interventions and cycle times that stay stable. What you need to plan for The heater is vacuum compatible, but thermal mass and radiative coupling can make the chamber wall run hotter than the process window. Plan heat load management up front, confirm flange orientation and clearance, and set the controller PID tuning to match your wafer stack. Once those details are aligned, repeatability is there—but you earn the performance in the install.

Vacuum on Global Infrared Heating Systems

Vacuum chamber infrared heater

Why Gold is a Must for Your Vacuum IR Heaters

Vacuum compatible infrared heater