(1) Spray-drying Mg(OH)₂ or MgO Slurry -> Sintering Granules to Dense Spherical MgO

 

Manufacturer	YU (한국 Academic Research)	Soul Material (한국)	Tateho / Denka (일본)
Raw Materials	MgO/Mg(OH)2 + Sintering Additives1)	Mg(OH)2 + Sintering Additives5)	MgO + Sintering Additive6)
Slurry (Solvent)	DI Water	DI Water	Alcohol (Organic)
Mixing	Wet Milling (Ball-Milling)2,3)	Wet Milling	Wet Milling
Granulation	Aqeuous Spray Drying4)	Aqeuous Spray Drying	Non-aq. Spray Drying6)
Granules	MgO/Mg(OH)2 phase	Mg(OH)2 phase	MgO phase
Sintering Temp.	1350 oC	~1400 oC	>1600 oC
Shape of Fillers	Spherical	Spherical	Spherical
Surface Treatment*)	Coupling Agent <0.25~0.5%	-	-
Moisture Absorption	0.00%	<0.1%	0.1%
Remarks	Humidity Test : 85oC/85% 72h	85oC/85% 72h	85oC/85% 168h

1) Kor. Patent 10-2024-0038321, 2) Kor. Patent 10-2024-0196685, 3) Kor. Patent 10-2025-0010001, 4) Kor. Patent 10-2724809

5) Kor. Patent 10-2143817 & 10-2205178,  6) US Patent 8518536, Kor. Patent 10-2404942 & PCT/JP2021/033639

 

*) Surface treatment not only improves the moisture resistance of the magnesium oxide heat dissipation filler, but also has the advantage of facilitating heat transfer by strengthening the bond between the filler surface and the resin in TIM.

 

  A. Yeungnam University (Korea)

 

A-1 MgO Fillers from Mg(OH)₂ Slurry

A-2 MgO Fillers from MgO Slurry

A-3 Comparison of MgO Fillers

 

    B. Soul Material (Korea)

 

    C. Denka / Tateho (Japan)

       

 

(2) High Temperature Heat-treatment and then crushing of MgO

 

Manufacturer	Ube Industries5) (일본)	Remarks
Raw Materials	Mg(OH)2 + CaO, SiO2	Impurity B2O3 < 0.5%
Sintering Temp.	1800~2000oC	Rotary Kiln
Shape of Fillers	Roundish	not spherical
Moisture Absorption	0.18~0.36%	85oC/85% 48h
Surface Treatment	Halogen e.g. NH4F + Silanes	120~200oC
Moisture Absorption	0.0 ~ 0.1%	After Surface Treatment
Humidity Test	121oC/100% 24h

                                                              5) PCT/JP2021/044152, Kor. Patent 10-1981636 & 10-1933142

 

    A. Ube Industries (Japan)

 

       

 

 

(3) Flame Sintering of MgO Powders

 

   - Under research