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Titanium carbonitride base metal ceramic machinery sealing material and preparation method thereof

A mechanical seal and titanium carbonitride technology, which is applied in the field of titanium carbonitride-based cermet materials, can solve the problems of increased wear, poor sealing performance, low temperature and pressure resistance, etc., to improve performance-price ratio, reduce sealing cost, The effect of satisfying the sealing performance

Inactive Publication Date: 2008-09-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rubber sealing materials are easy to age, have low temperature and pressure resistance, and poor corrosion resistance. In addition, due to the elasticity of the rubber itself, the friction between the sealing material and the substrate is increased, which not only aggravates the wear between the two, but also makes the switch Valves are laborious; asbestos sealing materials have the disadvantages of short life and perishability, so the sealing materials have to be replaced frequently and cause losses; metal sealing materials are expensive and have poor sealing performance
Therefore, although there are many kinds of sealing materials, they cannot meet the application of pump body and valve mechanical sealing materials in modern industry due to lack of practicability and suitable performance and price ratio.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 54%Ti(C 0.7 , N 0.3 )-10%(WC-TaC)-15%WC-8%Mo 2 C-8%Ni-5%Co (weight ratio) is mixed with an appropriate amount of ethanol or acetone, after ball milling, drying, sieving, mixing with glue, drying and pressing, the compact is placed in a sintering-hot isostatic pressing furnace sintering in an argon atmosphere and a pressure of 1Mpa, the sintering temperature is 1380°C, and the holding time is 0.5h. After the holding is completed, it is cooled to room temperature with the furnace. The bending strength is 2043Mpa, the hardness HRA is 92.2, and it has high mechanical properties.

Embodiment 2

[0017] 54%Ti(C 0.7 , N 0.3 )-10%(WC-TaC)-15%WC-8%Mo 2 C-8%Ni-5%Co (weight ratio) is mixed with an appropriate amount of ethanol or acetone, after ball milling, drying, sieving, mixing with glue, and drying, the raw materials are placed in a discharge plasma sintering furnace, in an argon atmosphere, Sintering is carried out under a pressure of 15-40Mpa, the sintering temperature is 1380°C, and the holding time is 8 minutes. After the holding is completed, it is cooled to room temperature with the furnace and released from the furnace. The bending strength of the prepared titanium carbonitride-based cermet mechanical seal material is > 2100Mpa. Hardness HRA>92.0, with high mechanical properties.

Embodiment 3

[0019] 49%Ti(C 0.7 , N 0.3 )-15%(WC-TaC-TiC)-15%WC-8%Mo 2 C-8%Ni-5%Co (weight ratio) is mixed with an appropriate amount of ethanol or acetone, after ball milling, drying, sieving, mixing with glue, drying and pressing, the compact is placed in a sintering-hot isostatic pressing furnace sintering in an argon atmosphere and a pressure of 2Mpa, the sintering temperature is 1380°C, and the holding time is 0.5h. After the holding is completed, it is cooled to room temperature with the furnace. The bending strength is 2172Mpa, the hardness HRA is 91.5, and it has good mechanical properties.

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Abstract

The invention relates to an engineering material, particularly to a titanium carbonitride-base metal ceramic material for sealing pumps, valves and other machines. The titanium carbonitride-base metal ceramic material is prepared from Ti (C, N) powder, which has wide sources and low cost, as basic material, and binder, inhibitor and other additives as adjuvant materials. The preparation method comprises the steps of completely mixing the raw materials in ethanol or acetone solvent, drying, pressure moulding, placing the obtained blank into a reaction furnace, performing liquid sintering under vacuum or gaseous protection condition, and optimizing to obtain dense material with high hardness, and high bending strength and fracture toughness property. The inventive material has the advantages of resistance against high temperature, corrosion and abrasion, and low cost; and can be used for sealing pumps, valves and other machines. The preparation method has the advantages of simple process and applicability to industrial production; and has wide market application prospect.

Description

technical field [0001] The invention relates to an engineering material, specifically a titanium carbonitride-based cermet material suitable for mechanical seals of pumps and valves. Background technique [0002] At present, the mechanical seal materials used for pump bodies and valves mainly include the following types: (1) rubber materials; (2) asbestos materials; (3) metal materials. Rubber sealing materials are easy to age, have low temperature and pressure resistance, and poor corrosion resistance. In addition, due to the elasticity of the rubber itself, the friction between the sealing material and the substrate is increased, which not only aggravates the wear between the two, but also makes the switch Valves are laborious; asbestos-based sealing materials have the disadvantages of short life and perishability, so the sealing materials have to be replaced frequently resulting in losses; metal sealing materials are expensive and have poor sealing performance. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/04C22C1/04C04B35/56
Inventor 刘颖赵志伟望军夏珊高升吉涂铭旌
Owner SICHUAN UNIV
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