Additive for silicon nitride sintering bodies
A technology of additives and sintered bodies, which is applied in the field of additives for silicon nitride sintered bodies, can solve the problems of increased production costs and high sintering temperatures, and achieve the effect of reducing specification requirements
Inactive Publication Date: 2018-05-18
LUOYANG MINGLI TECH DEV
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- Description
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- Application Information
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Problems solved by technology
Commonly added sintering aids are oxides of rare earth elements, such as yttrium oxide and lanthanum oxide, which can effectively prevent Si 3 N 4 Decomposition in the sintering process, but the sintering temperature is high, which has high requirements on the specifications of the sintering furnace and auxiliary equipment, resulting in an increase in production costs
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0012] An additive for a silicon nitride sintered body, comprising the following components in parts by weight: MgO-CeO as a sintering aid 2 15 copies, Al 2 o 3 10 parts; LiO as composite oxide 2 5 copies, Y 2 o 3 5 copies, La 2 o 3 8 parts, SiO 2 5 parts, Al 2 o 3 8 servings.
Embodiment 2
[0014] An additive for a silicon nitride sintered body, comprising the following components in parts by weight: MgO-CeO as a sintering aid 2 17 copies, Al 2 o 3 11 parts; LiO as composite oxide 2 6 copies, Y 2 o 3 6 copies, La 2 o 3 9 parts, SiO 2 6 parts, Al 2 o 3 9 servings.
Embodiment 3
[0016] An additive for a silicon nitride sintered body, comprising the following components in parts by weight: MgO-CeO as a sintering aid 2 18 copies, Al 2 o 3 12 parts; LiO as composite oxide 2 7 copies, Y 2 o 3 6 copies, La 2 o 3 10 parts, SiO 2 7 copies, Al 2 o 3 9 servings.
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An additive for silicon nitride sintering bodies comprises, by weight, 15-20 parts of MgO-CeO2 serving as sintering aids, 10-12 parts of Al2O3, 5-8 parts of composite oxides, 5-7 parts of Y2O3, 8-10 parts of La2O3, 5-8 parts of SiO2 and 8-10 parts of Al2O3. The additive has the advantages that the MgO-CeO2 is taken as the sintering aids, so that sintering can be realized when the temperature is lower than 1700 DEG C, specification requirements of a sintering furnace and auxiliary devices are reduced, and production cost increase is not needed.
Description
technical field [0001] The invention belongs to the technical field of silicon nitride sintered bodies, in particular to an additive for silicon nitride sintered bodies. Background technique [0002] Silicon nitride is an atomic crystal compound composed of nitrogen and silicon through strong covalent bonds. The heat of formation is 733.6kJ / mol, which is lower than the 941.69kJ / mol released by the combination of two nitrogen atoms to form nitrogen (N2). Therefore, even if the sintering temperature is reached under the condition of no sintering aid, α-silicon nitride will decompose to generate nitrogen and free silicon without sintering. In the prior art, the decomposition of silicon nitride is suppressed by applying pressure or adding sintering aids to realize sintering. Commonly added sintering aids are oxides of rare earth elements, such as yttrium oxide and lanthanum oxide, which can effectively prevent Si 3 N 4 Decomposition in the sintering process, but the sintering...
Claims
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IPC IPC(8): C04B35/63C04B35/64C04B35/584
CPCC04B35/6303C04B35/584C04B35/64C04B2235/3203C04B2235/3217C04B2235/3225C04B2235/3227C04B2235/3418
Inventor 孙琼珂袁波张玲
Owner LUOYANG MINGLI TECH DEV