Preparation method of high-performance ceramic

A high-performance, ceramic technology, applied in the field of ceramic materials, can solve the problems of inability to realize 3D printing intelligent manufacturing and near-net-size molding, difficult to control product size, uneven product shrinkage, etc., achieving short cycle time, low cost, and high strength. Effect

Active Publication Date: 2015-05-20
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Abstract
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Problems solved by technology

If this method is used to prepare ceramic parts, it is necessary to reserve a powder inlet to fill it with ceramic powder. After shaking the powder, it is necessary to vacuumize (almost difficult to achieve) and then perform hot isostatic pressing after welding and packaging. The process is complicated. Moreover, the shrinkage during HIP sintering is too large (more than 50%), and the size of the product is difficult to control. Moreover, for some parts with more complex structures, it is difficult to shake the local area, resulting in serious uneven shrinkage of the product, and the 3D printing cannot be realized. Smart manufacturing and near net shape forming

Method used

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Examples

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Embodiment 1

[0032] Example 1: Si 3 N 4 Gear parts (participating in figure 1 , A is the gear blank, B is the gear blank covered with hot isostatic pressing, in which 1 is the gear blank; 2 is the jacket)

[0033] (1) Design the 3D digital model of the gear and its cover with 3D modeling design software (such as UG, Solidworkds), and convert it into STL format with slice layering software and import it into the selective laser sintering equipment.

[0034] (2) According to a certain proportion, Si mixed with sintering aids 3 N 4 The powder and double atmosphere A-type epoxy resin powder are mixed uniformly by ball milling, and then laminated with selective laser sintering equipment to print Si 3 N 4 Gear blanks. Si used 3 N 4 The particle size of powder granulation is 20-150 μm, and the particle size of bisphenol A epoxy resin powder is 10-80 μm. The laser used in the selective laser sintering equipment is 50w CO 2 Laser, preheating temperature 40-60°C, single-layer thickness 0.1...

Embodiment 2

[0043] Embodiment 2: prepare Al 2 o 3 Artificial acetabulum (see Figure 4 )

[0044] (1) Design the three-dimensional digital model of the artificial acetabulum and the metal mold for compression molding with three-dimensional modeling design software (such as UG, Solidworks).

[0045] (2) Al mixed with release agent, sintering aid, binder and other materials 2 o 3 The powder is molded to make the blank of the artificial acetabular prosthesis.

[0046] (3) to Al 2 o 3 The artificial acetabular body is degummed to remove the adhesive. Firstly, the softening point temperature is raised to 90°C at a rate of 4°C / min, then raised to 150°C at a rate of 2°C / min to remove all water vapor, kept for 1 hour, and finally raised to 700°C at a rate of 2°C / min. Keep warm for 2h.

[0047] (4) to Al 2 o 3 The artificial acetabular body was subjected to cold isostatic pressing. The speed of cold isostatic pressing was 2-6 MPa / s, and the pressure was raised to 200-350 MPa. The pressu...

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Abstract

The invention relates to the field of ceramic materials and in particular relates to a preparation method of a high-performance ceramic. The preparation method of the high-performance ceramic comprises the following steps: a) preparing a ceramic part biscuit; b) dumping; c) carrying out isostatic cool pressing treatment; d) presintering; e) preparing a hot isostatic pressing sheath, concretely carrying out synchronous powder feeding and laser cladding treatment, and coating the ceramic part biscuit with the hot istostic pressing sheath; f) hot isostatic pressing sintering; and g) removing the hot isostatic pressing sheath, and precisely processing a ceramic part. The preparation method of the high-performance ceramic has the advantages that multiple technologies are combined, so that a complex ceramic part biscuit can be prepared through selective laser sintering, near-net forming of a complex ceramic part is realized, and compactness of the part biscuit subject to aftertreatment is improved; meanwhile, no vacuumizing or encapsulating needs to be carried out, and production processes are reduced; besides, technique is simple, period is short, efficiency is high, cost is low, and the obtained ceramic part is high in strength and good in performance.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a preparation method of high-performance ceramics. Background technique [0002] Engineering ceramics, also known as structural ceramics, are widely used in petroleum, chemical, mechanical, medical and other fields due to their high hardness, high strength, high wear resistance and good anti-corrosion performance. Traditional ceramic molding methods are suitable for preparing simple parts, but parts with complex shapes usually need to be realized with the help of complex molds, which has high manufacturing costs and long manufacturing cycles. [0003] SLS technology uses laser to selectively layer-by-layer sinter solid powder, and superimpose the sintered solidified layers to produce the desired shape of the workpiece. The SLS molding method has the characteristics of simple manufacturing process, high flexibility, wide range of material choices, cheap materials, low cost, high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622
Inventor 张培志曹冲祁海郭方全何成贵
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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