Magnesium oxide (MgO) is a white fine ceramic powder, in addition to its own sintering to make MgO ceramics, can also be synthesized with other compounds, composite or as an additive to make high-performance ceramics or crystals.Typical application scenarios of MgO are as follows:
I. Typical applications as the main component
1. MgO transparent ceramics
MgO transparent ceramics (specification: CGC-1) has the advantages of low density, high temperature resistance, high insulation, excellent mechanical properties, high infrared transmittance, good chemical stability and low emissivity, etc. It is a high-performance infrared window and sensor protection materials, etc.
2. MgAl2O4 transparent ceramics
MgAl2O4 transparent ceramics have excellent optical transmittance almost covering the ultraviolet to infrared region (190nm < λ < 6000nm), but also has the advantages of high hardness, high strength, high temperature resistance, low emissivity, resistance to sand erosion and rain erosion and impact resistance, and has been in the field of transparent armor, missile windows and fairings, etc . to achieve a wide range of applications. MgAl2O4 consists of MgO (specification: GFS-1) and Al2O3 by stoichiometry . ) and Al2O3 by the reaction of stoichiometric ratio 1:1, and the mass proportion of MgO is 28.2%.
3. Co2+doped MgAl2O4crystals
Co2+ doped magnesium-aluminum spinel (Co: MgAl2O4 ) crystals are effective materials for passive Q-tuned solid-state lasers operating in the near-infrared region, and the high-peak power pulsed lasers generated by its passive Q-tuning effect have the characteristics of little damage to the human eye, strong penetration ability, low transmission loss and strong optoelectronic countermeasures, which can be widely used in the fields of space optical communication, rapid ranging on the battlefield, and unmanned devices of LIDAR, etc. The mass percentage of 99.995% high purity MgO (specification: CGC-1) in Co2+ doped MgAl2O4 crystals is similar to that of MgAl2O4 transparent ceramics.
4. MgO-Y2O3 complex ceramics
The use of MgO (specifications: GFS-1) and nanometer Y2O3 between the existence of the “pinning effect” to inhibit each other’s grain growth, can be prepared than the mechanical properties of single-phase, optical transmittance is not inferior to the single-phase MgO-Y2O3 composite ceramics, can be used to manufacture transparent armor, missile cowl, high-temperature observation windows and aviation windows, etc. windows, etc. The volume ratio of MgO to Y2O3 in MgO-Y2O3 complex-phase ceramics is usually 1:1, which translates to an approximate 41.7% MgO by mass.
5. MgO system microwave dielectric ceramics
With the mobile communication, satellite communication technology update iteration, people for communication time and frequency band requirements are getting higher and higher, so that the low dielectric high Q ceramics become a research hot spot. On the one hand, MgO ceramics itself has superior dielectric properties ( εr=9.1, tanδ＜1. 6×10-6 ), which is an ideal microwave dielectric substrate material for 5G communication. On the other hand, MgO-TiO2-based (mainly MgTiO3 ) microwave dielectric ceramics have important applications in electronic components such as resonators and filters due to their excellent dielectric properties.MgTiO3 is formed by the reaction of MgO (specification: GFS-2) and TiO2 at a stoichiometric ratio of 1:1, with a MgO mass percentage of 33.3%.
Typical applications as additives
1. As a sintering additive for high-performance ceramic heat dissipation substrate
With the development of high power electronic devices in the field of high speed rail, aerospace and military industry towards high temperature, high frequency and high integration, high efficiency heat dissipation has become an urgent need. High-power devices realize heat exchange with the outside world through ceramic copper-clad plates. Currently the mainstream ceramic substrates are Si3N4, AlN and Al2O3, all of which require MgO (specification: GFS-1) as a sintering aid. Especially for Si3N4 ceramics with excellent comprehensive performance, in order to avoid the lattice defects generated by Al2O3 as an additive to increase the phonon scattering, MgO (specification: GFS-1) has become the preferred sintering additive for the preparation of high-thermal-conductivity Si3N4 ceramics, and the amount of its use is about 3%.
2. As sinteringadditives for transparent ceramics such as Al2O3, YAG and AlON
Transparent ceramics such as Al2O3, YAG and AlON have good mechanical properties, stable chemical properties and excellent optical transmittance, and are widely used in many fields such as lighting, optical and medical instruments, armor and infrared detection, etc. MgO (specification: GFS-1) as an additive can significantly reduce the solid-phase reaction temperature, drag the migration rate of grain boundaries, discharging the porosity, and promote densification; through the pinning effect Inhibit grain boundary migration, avoid abnormal grain growth, and optimize mechanical properties.The amount of MgO added in this kind of transparent ceramics is relatively low (<1%), but its dispersion is very important.
3. As a sintering aid for ZTA wear-resistant ceramics
Both Al2O3 and ZrO2 have properties such as high temperature resistance, wear resistance and better biocompatibility. Toughening Al2O3 with ZrO2 to prepare ZTA nano-complex phase ceramics can enhance their strengths and avoid their weaknesses, giving full play to their integrated advantages, and has important applications in aerospace, engine wear parts and artificial femoral ball heads, etc. The densification and grain refinement mechanism of MgO (specification: GFS-1) in ZTA ceramics is similar to that in Al2O3, and its usage is about 2%.
4. AsLiNbO3 crystal additive
Magnesium-doped lithium niobate (MgO: LiNbO3 ) crystals, which have their unique advantages in NCPM frequency doubling, mixing, and optical parametric oscillation (OPO) applications in lasers, are widely used in optical parametric oscillation, optical parametric amplification (OPA), quasi-phase matching, and integrated optical waveguides. The Curie temperature of LiNbO3 can be modulated using the doping of 99.995% high-purity MgO (specification: CGC-1), which is usually less than 5 mol%, which translates to a mass of about less than 1.4%.
The acquisition of high-performance ceramics is closely related to the properties of their starting materials and additives. The high purity, ultrafine and highly dispersed magnesium oxide GFS-1 and GFS-2 produced by Messi Biology by applying unique purification process and granulation technology have the following advantages:
(1) Purity as high as 99.95% and 99.995%, with extremely low sodium content;
(2) Good dispersibility, easy to achieve uniform distribution in various types of ceramic matrix;
(3) Small particle size, uniform size distribution, high sintering activity; good sphericity, good fluidity, easy to mold.
| Product Specification | GFS-1 | GFS-2 | CGC-1 |
| Powder Properties | |||
| Specific surface area(m2/g) | 7.2 | 70.4 | 8.5 |
| D50（µm） | 0.59 | 0.98 | 0.51 |
| Chemical composition | |||
| MgO (%) | ≥99.95 | ≥99.95 | 99.995% |
| Cl (%) | 0.048 | 0.035 | 0.002 |
| Al (ppm) | 10 | 5 | 3 |
| B (ppm) | 1 | 1 | 1 |
| Ca (ppm) | 19 | 4 | 2 |
| Fe (ppm) | 9 | 4 | 1 |
| Na (ppm) | 2 | 12 | 2 |
| P (ppm) | <1 | <1 | <0.5 |
| S (ppm) | <1 | <1 | <0.5 |
| Si (ppm) | 9 | 7 | 5 |
GFS-1\GFS-2 series of highly dispersible magnesium oxide once launched has caused thermal conductivity ceramics, transparent ceramics, functional ceramics market warm response. Has been using the product of research institutes, universities and related benchmark enterprises agreed that: the use of GFS-1\GFS-2 series of highly dispersible magnesium oxide prepared by a variety of products both in terms of product performance and stability have met or even exceeded expectations.
If you are interested in GFS-1\GFS-2\CGC-1 series of highly dispersible, high purity magnesium oxide related products, welcome to visit Hebei Messi Biology Co., Ltd. to get in touch.