The key to determining the optimal sintering temperature is to combine material properties, process verification, and industry standards to control the temperature between 800–1000℃. This range effectively activates the recrystallization of magnesium oxide grains, forming a dense insulating structure, while preventing metal shell deformation or material volatilization.
1. Determining the Temperature Range Based on Material Purity and Particle Size
|
Magnesium Oxide Powder Characteristics |
Recommended Sintering Temperature |
Explanation |
|
High Purity (≥99.9%) |
850–950℃ |
Fewer impurities, slightly lower recrystallization temperature, better energy consumption |
|
Nanoscale or Ultrafine Powder (<100 mesh) |
800–880℃ |
Large specific surface area, high activity, easy to sinter, over-burning must be prevented |
|
Conventional Electrical Grade (100–200 mesh) |
900–1000℃ |
Mainstream applications, sufficient temperature is required to ensure density |
In practice, when using high-purity powder from Liaoning Jiashun Technology or Dashiqiao Meier Magnesium Products, holding at 900℃ for 1.5 hours is the optimal combination.
2. Verify the optimal temperature point through gradient testing. It is recommended to conduct small-batch test firings at five temperature points: 800℃, 850℃, 900℃, 950℃, and 1000℃, with 3 samples per group. Test the following indicators:
Cold insulation resistance (≥500 MΩ)
Withstand voltage performance (AC 2000V, no breakdown after 1 minute)
Resistance after damp test (≥200 MΩ after 48 hours)
Result analysis: Select the temperature point with the most stable and unfluctuated overall performance as the optimal process parameter.
3. Reference to Industry Standards and Compliant Manufacturer Practices
HG/T 6445-2025 clearly stipulates that the sintering temperature should be controlled between 800–1000℃, and provides a complete, traceable thermal control curve.
Compliant repair manufacturers such as Liaoning Jiashun Technology and Dashiqiao Meier Magnesium Products use 900±50℃ as the standard process window.
In high-requirement applications such as medical and injection molding, 900–950℃ is preferred to balance performance and lifespan.
Temperatures below 800℃ can lead to incomplete recrystallization, while temperatures above 1050℃ may cause tube/shell deformation or seal failure.
