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Heat insulation functional gradient material and production process thereof

A technology of functionally graded material and thermal insulation functional material, which is applied in the fields of thermal insulation functionally graded material and its preparation, thermal insulation composite material and its preparation, and can solve the problems of advanced equipment, thin material shape, material cracking, etc.

Inactive Publication Date: 2009-10-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are some advantages, but there are also many disadvantages that need to be solved. For example, the preparation process requires advanced equipment, the preparation cost is high, the preparation process is too complicated, and the shape of the material is thin, etc., which are not suitable for mass production.
In addition, if no stabilizer is added to the ceramic material, it will lead to a phase change of the ceramic material during sintering, and the phase change will cause the material to crack, which will reduce the quality of the sintered sample.

Method used

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  • Heat insulation functional gradient material and production process thereof

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Experimental program
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Effect test

Embodiment Construction

[0017] The raw material Ni powder has a purity of 95% and a fineness of 200 mesh sieves.

[0018] Raw material ZrO 2 Nano powder, particle diameter 10nm.

[0019] Stabilizer Y 2 o 3 The purity is above 98%, and the fineness is about 20nm.

[0020] One tablet machine.

[0021] One argon (Ar) gas atmosphere tube sintering furnace.

[0022] 1. Preparation of ceramic phase

[0023] Weigh ZrO 2 11.3g, Y 2 o 3 1.8g, ground and mixed in a mortar to form a ceramic phase ZrO 2 ,spare.

[0024] 2. Ni-ZrO 2 Preparation of thermally insulating functionally graded materials.

[0025] (1) Make three layers of functionally graded materials, the weight ratio of each layer is respectively: 20% Ni-80% ZrO 2 ;40%Ni-60%ZrO 2 and 60% Ni-40% ZrO 2, each layer weighs 1.5g. First, grind and mix them in a mortar to obtain a mixture, and then add 20% Ni-80% ZrO 2 , 40% Ni-60% ZrO 2 and 60%Ni-40%ZrO 2 The metal-ceramic mixture was laminated and compacted layer by layer in the mold, an...

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Abstract

The invention relates to a heat insulation functional gradient material obtained by pressing, sintering a tri-layer mixed material composed of metal phase Ni and ceramic phase ZrO2 with different content in each layer. The variant range of Ni weight percentage is 0-60%, while variant range of ZrO2 weight percentage is 40-100%. The ceramic phase mainly includes ZrO2, and further Y2O3 in mol percentage of 6-10%. The production process includes overlapping three layers of mixed material sequentially, pressing under pressure of 35-50MPa to produce a green body, sintering the green body in an inert gas atmosphere under the temperature 1300-1500 DEG C.. The material is applicable for heat insulation material for internal combustion engine.

Description

1. Technical field [0001] The invention relates to a functional composite material and a preparation method thereof, in particular to a thermal insulation composite material and a preparation method thereof, in particular to a thermal insulation functional gradient material and a preparation method thereof. 2. Background technology [0002] Functionally graded materials are a kind of composite materials that can avoid the large stress concentration at the junction of two-layer composite materials under high temperature and large temperature difference, thereby avoiding cracking and peeling of the material. Functionally graded materials have important applications in the fields of thermal insulation of spacecraft and combustion chambers of internal combustion engines, and have become a research hotspot in the field of composite materials in recent years. Among them, Ni-ZrO 2 The thermal insulation functionally graded materials represented by functionally graded materials hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/12C22C32/00C22C30/00C22C19/03C22C1/05C22C1/10
Inventor 胡献国冯忆艰程继贵徐玉福杜双松
Owner HEFEI UNIV OF TECH