The Ultimate Guide to Alumina Zirconia Melting Crucible Saggar

Product Description

Product Description

High Purity Alumina Zirconia Ceramic Crucible/Sagger

This product is made from high-purity alumina (Al2O3) material, sintered at high temperatures. It offers excellent resistance to high temperatures, chemical corrosion, and high insulation properties, making it an ideal choice for applications involving high-temperature melting, heat treatment, material analysis, and chemical experiments. Our alumina crucible/Sagger have a dense structure and low porosity, which effectively prevents sample contamination and ensures the accuracy of experimental results.

Zirconia Crucible: Due to its higher melting point and excellent heat insulation properties, it is mainly used for smelting platinum group metals, rare metals, and special materials that have extremely high requirements for high-temperature resistance and thermal shock resistance.

Specification

Alumina Core Advantages

Superior Chemical Corrosion Resistance:    Highly stable chemically, capable of resisting erosion from acids, bases, and various molten metals.

High Purity:                                                                With an alumina content of over 99.7%, the crucible has extremely low impurity levels, preventing sample contamination and making it especially suitable for high-purity applications.       

High Mechanical Strength:                                Possesses high hardness and good thermal shock resistance, making it less prone to cracking or deformation during rapid heating and cooling cycles.

Various Specifications & Shapes:                      Available in a range of standard sizes and shapes, including cylindrical, conical, arc-shaped, and square. Customization services are also available to meet specific customer requirements.    

Excellent High-Temperature Resistance:                Can withstand a maximum operating temperature of up to 1750°C, meeting the requirements of most high-temperature experiments and industrial processes.

Important Notice

Please inspect for any cracks before use to ensure safety. 

Ensure the crucible is clean and dry before use.

Avoid using it at temperatures exceeding its maximum operating temperature.

Not recommended for melting strong alkaline substances such as Na2O2 and NaOH.

Alumina Ceramic Data Sheet
Item	Unit	Typical Values
Physical Properties
Color	White/Ivory
Density	g/cm3	3.85
Alumina Content	%	92%,95%,96%,99%
Gas permeability	0
Water Absorption	0
Mechanical Properties
MONS' Hardness	82
Vickers Hardness (Hv50)	Gpa(Kg/mm²)	15.7(1600)
Flexural Strength(20°C)	Mpa	330
Compressive Strength(20°C)	Mpa	2000
Fracture Toughness(20°C)	MPam1/2	4
Thermal Properties
Thermal Conductivity(20°C-400°C)	W(m.K)	27.5
Thermal Expansion Coefficient	10-6/°C	7.6
Thermal Shock Resistance	T°C	200
Maximum Use Temperature	°C	1650
Electronic Properties
Dielectric Strength	KV/mm	>10
Dielectric Constant	er	9.1
Dielectric Loss Angle(1MHz)	0.0002-0.0003
Volume Resistivity	Ω.cm	>10(14)

The physical property differences between Alumina and Zirconia

Melting Point and Operating Temperature

Alumina (Al2O3): Has a melting point of approximately 2072°C. It's typically used below 1600°C, and can be used for short periods up to 1800°C.
Zirconia (ZrO2): Has a melting point of approximately 2715°C, which is significantly higher than alumina. This gives it superior temperature resistance, allowing it to operate for extended periods at higher temperatures.
  

Thermal Conductivity

Alumina: Has good thermal conductivity, allowing it to quickly transfer heat to the material inside the crucible.
Zirconia: Has the poorest thermal conductivity of all oxide ceramics, making it an excellent insulating material.
  

Coefficient of Thermal Expansion

Alumina: Has a relatively low coefficient of thermal expansion.
Zirconia: Has a higher coefficient of thermal expansion than alumina. This gives it better thermal shock resistance, making it less likely to crack from rapid temperature changes.
 

Corrosion Resistance

Alumina: Is resistant to acid and alkali corrosion but will react with strong alkaline melts.
Zirconia: Has better corrosion resistance to many molten metals, especially at high temperatures.

Applications

Alumina Ceramic Crucible

Laboratory Use: Thermal analysis (TGA, DTA), ashing, calcination, melting

Industrial Use: Metal and glass melting, single crystal growth, catalyst carriers, high-temperature sintering

Zirconia Ceramic Crucible

High-Temperature Melting: Used for melting precious and rare metals with extremely high melting points, such as platinum and rhodium.
Crystal Growth: Applied in the growth of single crystals like sapphire and YAG to ensure high purity.
High-Temperature Analysis: Serves as a sample container in thermal analysis experiments due to its chemical inertness and corrosion resistance.
Thermal Insulation: Used for insulation in ultra-high-temperature furnaces because of its extremely low thermal conductivity.
Specialized Industries: Applied in nuclear and aerospace fields for processing materials that require exceptional purity and high-temperature resistance.

If you are looking for a universal, moderately priced high-temperature crucible, alumina is usually the first choice. However, if you need to handle materials with extremely high melting points, or have specific requirements for thermal shock resistance, then zirconia crucibles would be a more professional option.

Drawings & Dimensions

Available in various specifications and sizes.Customization services are also available.

Company Profile

Qingdao TTWY International Trade Co., Ltd

Our company specialized in producing casting equipment. It is located in Qingdao, a beautiful harbor city, which is convenient in transportation. Especially in Refractory products, for expamle, the Quartz Crucible, Graphite crucible, Fire Assay Clay Crucible, Mullite Ceramic Crucible, Zirconia/Alumina(Al2O3) Ceramic Crucible, etc.

With high quality, reasonable price and attentive service the products produced by TTWY have wined trust from clients at home and aboard.

Packaging & Shipping

FAQ

Q1: What information should I let you know if i want to get a quotation?
A: The required material dimension (Thickness*Width*Length,diameter*length; if possible, please kindly supply us drawings).
The required more information, such as Surface Condition, Tolerance Request, The Quantity, and other mechanical and technical details.
     
If it is possible, please also provide the application of products, we will recommend the most suitable products with details for confirmation.
 
Q2: How do you gurantee the quality of the products?
A: Each step of production and finished products will be carried out inspection by QC department before storing in the warehouse. NG goods are not allowed in the completed goods warehouse.
 
Q3: Can you guarantee the prompt delivery?
A: Yes, when we get your inquiries, not only we will evaluate the more competitive price, but also we can get the most reasonable delivery time. So the prompt delivery can be guaranteed.
 
Q4: What is your lead time? 
A: It usually needs about 15- 20 days after receiving the PO. 
 
Q5: What is your payments terms?
A: T/T, L/C, Western Union, etc., could be acceptable. 
 
Q6: Can we visit your company?
A : Yes, for sure. It's my pleasure to visit our company.
 
Q7: What is the shipping cost?
A: The shipping cost is determined by the destination port, weight, packing size, total CBM of the products, we will try best to get the most reasonable shipping cost from the forwarders or express couriers to help you save more money.
 
Q8: What is the transportation way?
A: If the Gross Weight ≤45kg, it's better by express such as TNT, DHL, FedEx, etc. 
If the Gross Weight between 45kg to 100kg, by express or by air to your nearest airport can be both considered.
If the Gross Weight ≥100kg, you can choose by Air or Sea to the nearest port.
 
Q9: How service you can offer your clients? 
A: We provide presales service in various forms, for example, making investment budget, manufacturing planning, etc. so that customer make a reasonable plan with less cost. Moreover, we will also provide after sale service, for example, free training about machine applications ect. 

Update Date: 2026/01/28