Atmosphere control is a skill that almost ru"&"ined the entire batch
Last month, an old customer called, saying that the purity of the first few batches from the new furnace was not up to standard, with a scrap rate close to 40%. Upon inspection, the problem was that the atmosphere control pa"&"rameters were completely messed up. After adjusting them for an afternoon, the pass rate of the second batch immediately returned to over 90%.
What kind of gas?
Temperature is the only dividing line.Bel"&"ow 2200℃: High-purity nitrogen is the most cost-effective protective gas, providing excellent oxygen isolation at a much lower cost than argon. Above 2200℃: Nitrogen must be discontinued immediately! At high temperatures, nitrog"&"en reacts with carbon materials to form harmful phases such as carbon nitride, significantly reducing product purity. We have had instances where customers used the wrong gas at high temperatures, causing nitrogen to react with the product and render it u"&"nusable.
2200℃-3200℃ range: High-purity argon must be switched to, with a purity ≥99.999%. Argon almost never reacts with any materials below 3200℃.
How to ventilate? MFC Precise Control
<"&"p>We use a Mass Flow Controller (MFC) to precisely control the intake flow rate.
Micro-positive pressure control
The furnace pressure is maintained at a micro-positive pressure state of 500Pa-1500Pa:
- Effectively "&"prevents outside air from seeping into the furnace
- The pressure will not be too high, and will not increase the risk of leakage
- High-precision pressure sensors monitor in real time and automatically adjust in conjunction with the exhau"&"st regulating valve to achieve automatic pressure balance inside the furnace
Our operating suggestions: After the equipment arrives on site, ha"&"ve an experienced process engineer review every parameter of the atmosphere system, conduct several trial runs in conjunction with the product, record the data, and find the optimal control window. Once the necessary effort is put in and a stable"&" production process and technology are mastered, subsequent production will run much smoother, and management will have much less to worry about.")
