Semplice comprensione della ceramica di allumina
- Alumina ceramics are the most common advanced precision ceramics, valued for electrical insulation, alta conducibilità termica, chemical resistance, wear resistance and low thermal expansion.
- By purity: 99% alumina serves high-temperature crucibles, refractory furnace tubes and wear-resistant parts; 95-96% grades serve corrosion- and wear-resistant components and circuit boards.
- Key property data: electrical resistivity 1e14-1e15 ohm-cm, mechanical strength 300-630 MPa, compressive strength 2000-4000 MPa, durezza 15-19 GPa, conducibilità termica 20-30 W/mK, densità 3.75-3.95 g/cm3, and no-load operating temperature 1000-1500 C.
- Compared with zirconia ceramic rods, alumina rods withstand about 1700 C and have lower density, but poorer ductility — they crack more easily.
- Zirconia rods excel in ductility and are used for motor shafts, grinding and needle gauges; alumina rods dominate electronics, electrical and machinery fields.
Semplice comprensione della ceramica di allumina
Alumina ceramics are the most common advanced precision ceramic materials, e sono anche materiali relativamente tradizionali. Le ceramiche di allumina ad alta purezza sono state ampiamente utilizzate in molti settori come eccellente materiale ceramico. Questo materiale ha eccellenti prestazioni nell'isolamento elettrico, alta conducibilità termica, elevata resistenza chimica, buona resistenza all'usura, e bassa dilatazione termica.
Allumina ceramica can be divided into multiple application levels based on their alumina content, di cui 99% sono utilizzati per realizzare crogioli ad alta temperatura, refractory furnace tubes, and special wear-resistant materials, such as ceramic bearings, ceramic seals, and water valve pieces; 95% – 96% alumina ceramics are mainly used as corrosion resistant and wear-resistant components and circuit boards.
Properties of alumina:
Excellent electrical insulation (1 × 10 14〜1 × 10 15 Ω cm);
Medium to ultra high mechanical strength (300 A 630 MPa);
Extremely high compressive strength (2000 A 4000 MPa);
Elevata durezza (15 A 19 GPA);
Medium thermal conductivity (20 A 30 W/MK);
High corrosion and wear resistance;
Good grinding performance;
Bassa densità (3.75 A 3.95 g/cm3);
The operating temperature without mechanical load is 1000 A 1500 ° C;
Biological inertia, food compatibility.
Overview of the differences between alumina ceramic rods and zirconia ceramic rods
Ceramic rods, also known as ceramic rods, are mainly made of zirconia ceramic and alumina ceramic raw materials and calcined. The market demand for ceramic rods is very large, and they have been widely used in national defense, aerospaziale, industrial production, and other industries. The need for ceramic rods varies from field to field. The main issues to be considered are: resistenza all'usura, fire resistance, Resistenza alle alte temperature, resistenza alla corrosione, and wettability of ceramic rods.
Il ceramico rods are mostly ivory white, and the commonly used colors are dark blue ceramic rods, light yellow ceramic rods, gray black ceramic rods, and so on
Zirconia ceramic rod:
Zirconia ceramic rod has good wear resistance, elevata durezza, strong compression resistance, and a density of over 6.0. The main advantage of zirconia ceramic rod is its good ductility! Zirconia ceramic rods are widely used in industries such as motor shafts, motor shafts, macinatura, needle gauges, and especially in the heat removal commodity industry, rather than traditional stainless steel center rods.
Alumina ceramic rod:
The alumina ceramic rod can withstand high temperatures up to about 1700 degrees Celsius, and has good electrical conductivity, impact toughness, and high temperature resistance. The alumina ceramic rod has low density and convenient transportation, but its ductility is poor and it is easy to crack and crush; Alumina ceramic rods are widely used and have already infiltrated various fields such as electronic and electrical, mechanical equipment manufacturing, and so on
Sega ad anello in ceramica di allumina/filo diamantato senza fine-Ensoll #ceramic #alumina
To go from properties to process, the next step is taglio di precisione dell'allumina.
Domande Frequenti
What are alumina ceramics used for?
It depends on purity. 99% alumina ceramics make high-temperature crucibles, refractory furnace tubes and special wear-resistant materials such as ceramic bearings, seals and water valve pieces; 95-96% alumina ceramics mainly serve as corrosion-resistant, wear-resistant components and circuit boards.
What are the key properties of alumina ceramics?
Excellent electrical insulation (1e14-1e15 ohm-cm), medium to ultra-high mechanical strength (300-630 MPa), extremely high compressive strength (2000-4000 MPa), elevata durezza (15-19 GPa), medium thermal conductivity (20-30 W/mK), low density (3.75-3.95 g/cm3), no-load operating temperature of 1000-1500 C, plus high corrosion and wear resistance and biological inertness.
What is the difference between alumina and zirconia ceramic rods?
Alumina rods withstand temperatures up to about 1700 C, have lower density for easy transport, and resist impact and heat well, but their ductility is poor so they crack more easily. Zirconia rods have higher density (over 6.0) and their main advantage is good ductility, making them preferred for motor shafts, grinding and needle gauges.
Are alumina ceramics safe for food and medical use?
Alumina ceramics are biologically inert and food compatible. Combined with their corrosion and wear resistance, this makes them suitable for applications where contact with food or biological tissue is required.
Revisionato dal team di ingegneria Ensoll.
