Shaped Oblique-Hole Round Disc (Slanted Hole Disc)
Lightweight Mullite SeriesLightweight mullite shaped oblique-hole round discs are tailored insulating components with angled penetration channels. Engineered for directional burner alignment, angled thermocouple wells, and directional flow thermal sealing in specialized kilns.
| Parameter | Specification |
|---|---|
| Material | Lightweight Mullite (JM26 / JM28 / JM30) |
| Max Service Temp | 1350°C ~ 1600°C |
| Bulk Density | 0.8 ~ 1.1 g/cm³ |
| Cold Crushing Strength | ≥ 2.5 ~ 3.5 MPa |
| Thermal Conductivity (600℃) | ≤ 0.35 W/(m·K) |
| Angle Machining Tolerance | 5-Axis Precision CNC Machining ±0.5° |
Material Overview
Lightweight mullite shaped oblique-hole discs are fabricated from high-grade synthetic mullite refractory matrices. Formed via high-pressure pressing or precision gel casting followed by high-temperature sintering, the round perimeter and angled bore channels are precisely CNC-machined to exacting angle and dimensional standards.
In vacuum heat-treating furnaces, controlled-atmosphere furnaces, and roller kilns, probes and burner nozzles frequently enter the chamber at specified tilt angles. Field-drilling angled holes often causes localized stress concentration and thermal cracking. Our pre-engineered oblique-hole discs relieve thermal stresses and maintain superior thermal sealing across harsh thermal cycles.
Key Features
- Precise Angled Bores: Bore angle tolerance within ±0.5° ensures accurate alignment of process nozzles and sensor probes.
- Superior Thermal Insulation: Low density and low thermal conductivity minimize heat leakage and safeguard external equipment.
- Excellent Thermal Shock Resistance: High resistance to spalling under rapid temperature cycling.
- Chemical Corrosion Resistance: Inert against reducing/oxidizing atmospheres and mild chemical gases.
- Full Custom Fabrication: Custom outer diameters, thickness, number of oblique holes, offset, and inclination angles (15°~75°).
Technical Specifications
| Property | JM26 | JM28 | JM30 |
|---|---|---|---|
| Max Service Temp (°C) | 1450 | 1550 | 1600 |
| Bulk Density (g/cm³) | 0.80 | 0.90 | 1.05 |
| Cold Crushing Strength (MPa) | ≥ 2.2 | ≥ 3.0 | ≥ 3.6 |
| Al₂O₃ (%) | ≥ 56 | ≥ 68 | ≥ 73 |
| Fe₂O₃ (%) | ≤ 0.8 | ≤ 0.6 | ≤ 0.5 |
| Thermal Conductivity @ 600°C (W/m·K) | 0.29 | 0.34 | 0.42 |
| Reheat Linear Change (%) | 1400°C×12h: ≤ -0.4 | 1500°C×12h: ≤ -0.4 | 1550°C×12h: ≤ -0.5 |
