MAGSCIE BRAND: DMK

Introduction

Direct Bonded Magnesia Chrome Bricks (DMK), the term direct bonded describes the direct attachment of the magnesia to the chrome ore without intervening films of silicate. Direct-bonding was made possible by combining high purity chrome ores and magnesites, and firing them at extremely high temperatures. The direct bonding degree of the product increases with the decrease of SiO₂ content and the increase of sintering temperature. High strength at elevated temperatures is one of the single most important properties of direct-bonded brick. They also have better slag resistance and better resistance to “peel spalling” than silicate-bonded brick.

Properties 

DMK have properties of excellent thermal shock stability, slag attack resistance, thermal fatigue resistance, vacuum damage resistance. In addition, they are resistance to oxidation-reduction, comparatively better wear resistance and erosion resistance. Under vacuum refining conditions, or strong oxidation atmosphere, or ultrahigh temperature liquid erosion, or high alkaline slag liquid and alkalinity changes slag liquid attacks, the service life ranks second, only behind Rebonded Fused Magnesia Chrome Bricks (RMK). And even DMK is a kind of more economical refractory that used in furnace lining.

Direct Bonded Magnesia Chrome Bricks are available with various ratios of magnesite-to-chrome ore.

The balance of properties of the bricks is a function of the magnesite-to-chrome ore ratio. For example, a direct bonded brick containing 60% magnesia would generally be regarded as having better spalling resistance than one containing 80% magnesia. Although the latter might be considered a better choice in a highalkali environment. This changing balance of properties as a function of the ratio of magnesite-to-chrome ore makes it possible to choose products best suited for an individual application.

Technical data sheet of Direct Bonded Magnesia Chrome Bricks

DMK made of magnesite and chromite, processed by high temperature firing. This product has few impurities. After being fired at high temperature and ultra-high temperature, the glass phase is concentrated in the triangle area of the crystal phase, and the crystal phase are directly combined. After Impregnation process treatment, the physical and chemical properties of DMK are greatly improved. The porosity will be reduced by 7%, the bulk density will increase by 0.05g/cm³, and the Cold Crushing Strength will increase by about 30MPa. This is an additional procedure.

Internal photo of DMK after cutting:

What are direct bonded magnesia chrome bricks used for?

Direct Bonded Magnesia Chrome Bricks (DMK) are widely used at Steel Smelting Furnaces working linings, such as RH Degasser, VOD Ladles, AOD Converters, EAF Furnace, Kaldo Converters etc. Or critical parts safety linings, Non-ferrous Smelting Furnaces working linings. Such as IC3 Converters, Pierce Smith Furnaces, Noranda Furnaces, Outokumpu Flash Smelting Furnaces, Reverberatory Furnaces etc. Sometimes they are used at Chemical Industries and Paper Industries furnaces working lining bricks.

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MAGSCIE Refractory is a manufacturer specializing in the production of refractories with decades of experience. So we can provide the most professional services in kilns solutions. And also, relying on rigorous production management, each Magnesia Chrome brick is guaranteed to meet high product quality standards. If you have any trouble in kiln or furnace solutions, CLICK HERE to seek free consultation and quote.

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