Gas atomization is a kind of high efficient technique to produce high-quality metal powders. It makes the metal powders with spherical shape, clean surfaces and uniform particle sizes. And gas atomization is becoming more and more popular in modern powder production due to its high quality production.
In order to support the processing of gas atomization, INNOVACERA presents a series of atomizing nozzles including Boron Nitride and Zirconia material. We have BMA, BSC, BMZ, BAN and BSN which are all well used for metal powder’s atomization, especially BMA and BMZ are very popular. Hot pressed Boron Nitride nozzles are often used for producing nickel powder, copper powder and aluminum powder. The max working temperature is 1700- 1800℃ in vacuum.
Boron Nitride Material Properties
| Properties | Unit | UHB | HB | BC | BMS | BMA | BSC | BMZ | BAN | BSN |
| Main Composition | – | BN>99.7% | BN>99% | BN>97.5% | BN+SiO2 | BN+Al2O3 | BN+SiC | BN+ZrO2 | BN+AlN | BN+Si3N4 |
| Color | – | White | White | White | White Graphite | White Graphite | Greyish-Green | White Graphite | Greyish-Green | Gray Black |
| Density | g/cm³ | 1.6 | 2 | 2.0~2.1 | 2.2~2.3 | 2.25~2.35 | 2.4~2.5 | 2.8~2.9 | 2.8~2.9 | 2.2~2.3 |
| Three-Point Bending Strength | MPa | 18 | 35 | 35 | 65 | 65 | 80 | 90 | 90 | / |
| Compressive Strength | MPa | 45 | 85 | 70 | 145 | 145 | 175 | 220 | 220 | 400~500 |
| Thermal Conductivity | W/(m·k) | 35 | 40 | 32 | 35 | 35 | 45 | 30 | 85 | 20~22 |
| Thermal Expansion Coefficient (20~1000°C) |
10⁻⁶/K | 1.5 | 1.8 | 1.6 | 2 | 2 | 2.8 | 3.5 | 2.8 | / |
| Max Using Temperature Atmosphere / Inactive Gas / Vacuum |
°C | 900 / 2100 / 1800 | 900 / 2100 / 1800 | 900 / 2100 / 1900 | 900 / 1750 / 1750 | 900 / 1750 / 1750 | 900 / 1800 / 1800 | 900 / 1800 / 1800 | 900 / 1750 / 1750 | 900 / 1750 / 1700 |
| Room Temp Electric Resistivity | Ω·cm | >10¹⁴ | >10¹⁴ | >10¹³ | >10¹³ | >10¹³ | >10¹² | >10¹² | >10¹³ | / |
| Typical Application | – | Nitrides Sintering | High Temp Furnace | High Temp Furnace | Powder Metallurgy | Powder Metallurgy | Powder Metallurgy | Metal Casting | Powder Metallurgy | Metal Casting |
The benefits of BN atomizing nozzles
1.Non wetting make it reduce the frequency of nozzle replacement
2.Good surface finish make tolerances better
3.Very good thermal shock resistance makes BN not have to be pre-heating widely
Besides Boron Nitride nozzles, INNOVACERA also supplies Zirconia nozzles for powder metal atomization. This is also a very good option on material for the gas atomization. The max working temperature for the Zirconia is 2000℃ in air, vacuum or atmosphere protection environment. Zirconia nozzles are available for almost all metal and alloy powders except tungsten, molybdenum powders.
The benefits of Zirconia nozzles
1.High thermal resistance make it excellent performace in high temperature atomization
2.Very good wear resistance
3.Chemical inertness make the nozzles not reactivity with atomized alloys
4.Low thermal conductivity
Technical Indicators
| Indicators | Item | Units | MSZ-H | MSZ-L | Custom |
| Main
Composition |
ZrO2 | % | ≥95 | ≥95 | 60-95 |
| Al2O3 | % | ≤0.2 | ≤0.2 | 0.2-20 | |
| SiO2 | % | ≤0.4 | ≤0.4 | 0.2-1 | |
| MgO | % | ≤2.9 | ≤2.9 | MgO/Y2O3 | |
| Fe2O3 | % | ≤0.1 | ≤0.1 | 0.1-0.3 | |
| TiO2 | % | ≤0.1 | ≤0.1 | 0.1-1.0 | |
| Physical | Color | – | Yellow | Yellow | Yellow/White |
| Density | g/cm3 | ≤5.2 | 5.4-5.60 | 4.6-5.6 | |
| Porosity | % | ≤18.5 | ≤8 | 1-18.5 | |
| The stabilizers, grains combination and porosity can be designed according to customer’s using environment. | |||||
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