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Granulation method of silicon carbide composite ceramic material

A technology of composite ceramics and silicon carbide, which is applied in the field of ceramic materials, can solve the problems of large density difference between metal powder and ceramic powder, uniform mixing of organic binder, high production dimensional accuracy, etc., and achieve less machining and stable size , The effect of high dimensional accuracy

Active Publication Date: 2019-03-29
GUANGDONG REAL FAITH LIGHTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the above-mentioned problems in the prior art, the present invention provides a method for granulating silicon carbide composite ceramic materials. On the one hand, metal powder is added as a reinforcing phase during the preparation process, so that the produced particles have the same properties as metals. The advantages of injection molding, high dimensional accuracy, less machining, and smooth surface; on the other hand, the preparation method provided by the invention can solve the problem that metal powder and ceramic powder cannot directly use organic binder due to the large difference in density. The problem of uniform mixing makes the metal powder disperse very uniformly in the composite ceramic material

Method used

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  • Granulation method of silicon carbide composite ceramic material
  • Granulation method of silicon carbide composite ceramic material
  • Granulation method of silicon carbide composite ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment uses the raw material of following mass percentage:

[0042] Metal powder granulation: 304L powder 9.2KG, organic binder 0.8KG, 304L powder particle size is 8um.

[0043] Ceramic granulation: 5KG of β-silicon carbide powder, 2KG of β-alumina powder, 3KG of organic binder, in which the particle size of silicon carbide is 5um and the particle size of alumina is 3um.

[0044] The composition of the organic binder: POM 88wt%, HDPE 7.5wt%, EVA 2wt%, PE wax 1wt%, SA 1.5wt%.

[0045] The granulation method of the present embodiment combines figure 1 Shown as:

[0046] Step 1: Metal powder granulation: set the temperature of the first to fourth zones of the mixer extruder integrated machine to 140-150-160-200°C, put 304L powder and organic binder into the mixer, and the mixing speed is 5r / min, kneading for 30min, after the material becomes a paste, the temperature in the fourth zone is lowered to 160°C, extruded and pelletized at the same time, the ext...

Embodiment 2

[0053] The present embodiment uses the raw material of following mass percentage:

[0054] Metal powder granulation: SU-316 powder 9.0KG, organic binder 1.0KG, SU-316 powder particle size 10um.

[0055] Ceramic granulation: β-silicon carbide powder 5KG, β-alumina powder 2.5KG, organic binder 2.5KG, of which silicon carbide particle size is 6um and alumina particle size is 3.5um.

[0056] The composition of the organic binder: POM 85wt%, HDPE 8wt%, EVA 2wt%, PE wax 2wt%, SA 3wt%.

[0057] The granulation method of the present embodiment combines figure 1 Shown as:

[0058] Step 1: Metal powder granulation: set the temperature of the first to fourth zones of the mixer extruder integrated machine to 140-150-160-200°C, put SU-316 powder and organic binder into the mixer, and mix After 30 minutes, after the material becomes a paste, the temperature in the fourth zone is lowered to 160°C, and the extrusion and pelletizing are carried out at the same time. The extrusion rate is 10...

Embodiment 3

[0065] The present embodiment uses the raw material of following mass percentage:

[0066] Metal powder granulation: SU-304 powder 9.5KG, organic binder 0.5KG, SU-304 powder particle size 12um.

[0067] Ceramic granulation: 4.5KG of β-silicon carbide powder, 3KG of β-alumina powder, 2.5KG of organic binder, among which the particle size of silicon carbide is 7um and the particle size of alumina is 5um.

[0068] The composition of the organic binder: POM 87wt%, HDPE 7wt%, EVA 3wt%, PE wax 1.5wt%, SA 1.5wt%.

[0069] The granulation method of the present embodiment combines figure 1 Shown as:

[0070] Step 1: Metal powder granulation: set the temperature of the first to fourth zones of the mixer extruder integrated machine to 140-150-160-200°C, put SU-304 powder and organic binder into the mixer, and mix After 60 minutes, when the material is in paste form, the temperature in the fourth zone is lowered to 160°C, extruded and pelletized at the same time, the extrusion speed is...

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Abstract

The invention relates to a granulation method of a silicon carbide composite ceramic material. The granulation method comprises the following steps: S1, a metal material is granulated, specifically, stainless steel powder and an organic binder are put into an internal mixer, mixing is conducted for 30-180 min, then squeezing and cutting into granules are conducted, and thus metal material granulesare prepared; S2, the silicon carbide composite ceramic material is granulated, specifically, ceramic powder and an organic binder are put into the internal mixer to be mixed for 30-180 min, then themetal material granules prepared in the step S1 are added into the internal mixer, thus the mass of the metal material granules accounts for 30-35% of the total material mass in the internal mixer, after mixing continues being conducted for 30-120 min, squeezing and cutting into granules are conducted, and thus the stainless steel reinforced silicon carbide based composite ceramic granules are obtained. According to the granulation method, the metal material is granulated separately firstly, the metal material, a ceramic powder material and the organic binder are mixed in the internal mixer and subjected to squeezing granulation, the problem that the difference between the stainless steel powder and the ceramic powder is large, and consequently even mixing cannot be conducted directly issolved, a granule material with good fluidity is prepared so as to be directly injected into a billet, and the size accuracy of the billet is maintained.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a method for granulating silicon carbide composite ceramic materials, and the granules can be used for direct injection molding or hot-press molding. Background technique [0002] Silicon carbide ceramic materials have excellent characteristics such as high temperature strength, high temperature oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness, thermal shock resistance and chemical corrosion resistance. Automobiles, mechanical chemicals, environmental protection, space technology, information electronics, energy and other fields have increasingly wide applications, and have become an irreplaceable structural ceramic with excellent performance in many industrial fields. [0003] Although silicon carbide ceramics have superhard wear resistance, low density (about 3.20g / mm 3 )...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/565C04B35/63
CPCC04B35/565C04B35/62695C04B35/6303C04B2235/405C04B2235/5427C04B2235/5436C04B2235/6022
Inventor 丁萍黄琼杨光辉梁裕华
Owner GUANGDONG REAL FAITH LIGHTING TECH
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