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Some products from the same furnace are over"&"-fired while others are under-fired; the problem is most likely with the temperature field.
Two years ago, a customer contacted us, saying that the products from his factory's graphitization furnace had very poor batch-to-batch consistency. Produ"&"cts from the same furnace had different specifications; some met the requirements, while others did not. The quality varied depending on the location, resulting in an absurdly high rework rate. We sent an engineer to the site, and the problem was clear: <"&"strong>uneven temperature field.
What is temperature field uniformity?
You can think of the furnace as an oven; some areas are hot, some are cold, so naturally some of the food you bake will be burnt, and s"&"ome won't be cooked through. The principle is exactly the same in a graphitization furnace, only the temperature is much higher and the requirements are much stricter.
The industry typically uses ""±X℃"" to represent temperature field uniformity. It meas"&"ures the maximum temperature difference between any two points within the effective heating zone. Note that this refers to the ""effective heating zone,"" not the total furnace size.
How to verify temperature field uniformity?
Talk is cheap; we rely on "&"data. Before the equipment leaves the factory or during on-site acceptance, a third-party inspection using the **ceramic temperature measuring ring method** should be conducted:
**Important points are placed at different locations within the effective he"&"ating zone: upper, middle, lower, center, and edge.**
**The temperature measuring rings utilize the principle of **irreversible shrinkage** of ceramics at high temperatures—the degree of shrinkage corresponds one-to-one with the heating temperature.**
*"&"*Measure the dimensional changes of each temperature measuring ring using specialized equipment to deduce the actual temperature at that location.**
**Summarize the data, draw a temperature distribution map, and generate a complete temperature field unif"&"ormity test report.**
**Acceptance Recommendations**
**Important Reminder:** When purchasing a furnace, be sure to include the temperature field uniformity indicator in the contract and clearly define the verification method. Don't just listen to verba"&"l promises from salespeople; you need data, reports, and acceptance criteria. That's how you take responsibility for your product.")
