Dongguan Ming Rui Ceramic Technology Co.,ltd
Dongguan Ming Rui Ceramic Technology Co., Ltd
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Glazed Ignition Electrode Alumina Ceramic Tube Alumina Ceramic Spark Electrode for Ignition Device
The ceramic spark ignition rods are widely used in ignition devise of combustion machine, boiler, with strong points such as sensitive ignition, durable, strong ageing resistance, high temperature resistance, corrosion resistance, high dielectric strength. Standard interface thread is M14× 1.25, M16 × 1.5, M18 × 1.5, G1/2. Ignition electrode needle is Φ 2.6 Φ 3Φ 5 and Φ 3.5. The electrode needle length can be produced according to customer requirements, the ceramic parts of electrode needle can be assembled according to the different requirements of customers.
Ceramic ignition/ induction probe
Characteristics: Aging and high temperature resistance, perfect insulation, high strength, good stability, suitable for different environment.
Technical parameter: 0.5 to 1.5mm in diameter, length of 50- 80mm, insulation strength>15KV/mm.
Applications: All kinds of pipeline gas, liquefied petroleum gas, natural gas and electrical water heater, stove, gas oven ect with similar purpose.
| Material | 85 Al2o3 | 90 Al2o3 | 95 Al2o3 | 99 Al2o3 |
| Al2o3 | 85% | 90% | 93% | 99.30% |
| Fe2o3 | ≤ 1.0 | ≤ 0.5 | ≤ 0.5 | ≤ 0.3 |
| Desnsity: g / cm3 | 3.4 | 3.5 | 3.6 | 3.85 |
| Vickers Hardness | ≥ 8.6 | ≥ 8.8 | 9 | 9 |
| Water Absorption:% | ≤ 0.2 | ≤ 0.1 | ≤ 0.085 | ≤ 0.01 |
| Refractoriness:°C | 1580 °C | 1600 °C | 1650 °C | 1800°C |
| Flexural Strength:Mpa | 180 | 200 | 240 | 280 |
| Wear Rate( at room temperature, erosion, 100 grinding)% | ≤ 3 | ≤ 2.5 | ≤ 1 | ≤ 0.5 |
The protection sheath is mainly used for the protection of thermocouple sensor and making the sensor isolated with the outside environment. It can effectively prevent the element from being eroded, oxidized and broken.
| Product Name | High Purity One End Closed 99.5% Alumina Ceramic Tube 99% Al2o3 Pipe |
| Material | 95%, 99%, 99.5% and 99.7% Alumina |
| Color | Ivory |
| Standard | DIN 40680-1, DIN 40680-2; DIN EN 60672-1, DIN EN 60672-2, DIN EN 60672-3. |
| Straightness | ≤2‰ |
| Properties | Thermal resistance/ Wear resistance/ Stable Chemical Performance/ Corrosion resistance/ Electrical insulation, High compressive strength |
Mingrui alumina tubes are 99.5% to 99.8% high purity and offer elevated temperature stability. Alumina tubes are available in custom sizes, including American and Metric, and offer a low material cost.
Minerals containing alumina make up nearly 15% of the earth’s crust. This makes it practically inexhaustible and versatile. Alumina provides the combination of low thermal expansion, superior thermal conductivity and high compressive strength making it thermal shock resistant and the ideal product for alumina tubes. Our alumina tube models have elevated dielectric properties and are gas tight providing a higher vacuum or protective atmosphere when at an extreme temperature.
These alumina tubes offer:
Typical Physical Properties of Alumina Tubes | ||
| MATERIAL | ALUMINA | |
| Composition | 99.80% AL2O3 | 99.5% AL2O3 |
| Bulk Specific Gravity (g/cc) | 3.9 | 3.8 |
| Color | Ivory | Ivory |
| Impenetrability | Gas Tight | Gas Tight |
| Dye Penetration A.S.T.M. | Tight | Tight |
| Flexural Strength (psi) | 70,000 | 50,000 |
| Compressive Strength (psi) | 370,000 | 350,000 |
| Tensile Strength (psi) | 43,000 | 33,000 |
| Maximum Working Temperature | 1800°C | 1750°C |
| Likely Sag Temp. Unsupported Tube* | 1600 oC | 1600 oC |
| Thermal Conductivity 24oC | 230 | 200 |
| (BTU-in/ft2-hr-oF) 800oC | 60 | 50 |
| Dielectric Strength 24oC V/Mil | 300 | 270 |
| Thermal Expansion (per oC x 10-6) | 8 | 8.4 |
| (24oC-1000 oC) | ||
| Hardness (Moh’s scale) | 9 | 9 |
| * Temperature at which an empty tube, 1 1/4″ diameter, suspended across an 18″ span, will sag 1/4″ in 1 hour. | ||
| Where sag is not acceptable, tubes must be adequately supported along the full length. | ||
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