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A kind of pressureless sintering to prepare high density ti 2 aln ceramic method

A ceramic and dense technology, which is applied in the field of pressureless preparation of high-purity and high-density ceramics, can solve the problems of expensive equipment, difficulty in obtaining structurally shaped parts, and complicated processes, and achieve the effects of convenient operation, high density, and simple process

Active Publication Date: 2021-08-31
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] From the research background, it can be found that Ti 2 AlN ceramics often adopt high-tech sintering methods such as spark plasma sintering and hot isostatic pressing sintering, but these sintering methods have expensive equipment, complicated processes, and it is difficult to obtain special-shaped parts with complex structures.

Method used

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  • A kind of pressureless sintering to prepare high density ti <sub>2</sub> aln ceramic method
  • A kind of pressureless sintering to prepare high density ti <sub>2</sub> aln ceramic method

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Experimental program
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Effect test

Embodiment 1

[0018] Elemental silicon is used as an additive, and the additive content is 3 at.%, and commercially available titanium powder and alumina powder with an atomic content ratio of 2:1 are used as raw materials, and the grinding balls and raw material powder are added to the ball mill tank; after ball milling for 6 hours, the The above powder was taken out, dried at 70°C, and formed by cold isostatic pressing at 200MPa; the formed test block was placed in a pressureless sintering furnace, vacuumed, and then heated to 1400°C at a heating rate of 5°C / min. ℃, heat for 2 hours for high-temperature firing, and then cool to room temperature with the furnace. figure 1 Shown is the XRD pattern of the sintered body. It can be seen from the figure that the sintered body is basically Ti 2 AlN, containing only a small amount of impurities (TiN), of which Ti 2 The purity of AlN is 95%. Through testing, the density of the sintered body is 95%, the microhardness is 3GPa, and the bending stre...

Embodiment 2

[0020] Use elemental tin as an additive, the additive content is 0.5 at.%, and commercially available titanium powder and alumina powder with an atomic content ratio of 2:1 are used as raw materials, and the grinding balls and raw material powder are added to the ball milling tank; after ball milling for 2 hours Take out the above powder, dry it at 100°C, and use 300MPa cold isostatic pressing to form it; put the formed test block in a pressureless atmosphere sintering furnace, pass it with argon, and then increase the temperature at a rate of 1°C / min , heated up to 1200°C, held for 8 hours for high-temperature firing, and then cooled to room temperature with the furnace. figure 2 Shown is the SEM photo of the cross-section of the sintered body. It can be seen from the figure that there are few pores in the sintered body, and the Ti 2 Layered crystals of AlN are clearly visible. The Ti in the sintered body was obtained by testing 2 The purity of AlN is 92%, the density is 9...

Embodiment 3

[0022] With elemental indium as additive, the additive content is 5at.%, with the commercially available titanium powder and aluminum oxide powder that the atomic content ratio is 2:1 as raw material, add grinding ball and raw material powder in the ball mill jar; After ball milling 4 hours, put The above powder is taken out, dried at 0°C, and formed by cold isostatic pressing at 100 MPa; the formed test block is placed in a pressureless atmosphere sintering furnace, and nitrogen is passed through, and then the temperature is raised at a heating rate of 10°C / min. To 1500 ℃, heat preservation for 2 hours for high-temperature firing, and then cool to room temperature with the furnace. The Ti in the sintered body was obtained by testing 2 The purity of AlN is 90%, the density is 92%, the microhardness is 5GPa, and the bending strength is 400MPa.

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Abstract

The invention relates to a method for preparing high-density Ti by pressureless sintering 2 The method for AlN ceramics belongs to the technical field of pressureless preparation of high-purity and high-density ceramics. It is characterized in that Ti and AlN are used as raw materials, IIIA and IVA elemental substances (such as elemental Si, Sn, In, etc.) are used as additives, and a small amount of additives is used to capture the solid-solution O element in metallic Ti to make Ti easier to combine with Al in AlN The reaction takes place, promoting the Ti 2 The formation of AlN; at the same time, additives are added to promote the formation of liquid phase in the sintered body, promote material transfer and promote Ti 2 Densification of AlN ceramics. The specific steps include: using commercially available titanium powder, aluminum nitride powder and additive powder with a certain content ratio as raw materials, adding grinding balls and raw material powder into a ball milling tank, using alcohol or water as a ball milling medium; The powder is taken out, dried, and formed by cold isostatic pressing at a certain pressure; the formed test block is placed in a pressureless atmosphere sintering furnace or a vacuum sintering furnace, passed through a sintering atmosphere or vacuumized, and then heated at a certain rate Raise to a certain temperature and keep warm. The present invention promotes Ti 2 The further development and application of AlN ceramics provides technical support, which has important practical significance and extensive social value.

Description

technical field [0001] Preparation of highly dense Ti by a pressureless sintering method 2 The method for AlN ceramics belongs to the technical field of pressureless preparation of high-purity and high-density ceramics. Background technique [0002] Traditional ceramic materials are brittle and have low fracture toughness due to the joint action of ionic bonds and covalent bonds. This characteristic makes traditional ceramic materials very difficult in mechanical processing. Ti 2 AlN ceramics is a new type of MAX-phase ceramic material. Its unique crystal structure makes it have both the high strength and high hardness of ceramics and the toughness of metals. Ti 2 Compared with traditional ceramics, AlN ceramics have more advantages in performance, mainly because of its unique physical and chemical properties and its ability to adapt to harsh and harsh environments that other materials cannot adapt to. [0003] Ti 2 The crystal structure of AlN ceramics is a close-packe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/626C04B35/64
Inventor 吴俊彦王志浩张学谦王志李庆刚吴昊
Owner UNIV OF JINAN