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Silicon nitride sintered body and sliding member using same

A technology of sliding components and sintered bodies, which is applied in the direction of anti-centrifugal force rotating parts, bearing elements, mechanical equipment, etc., can solve problems such as insufficient wear resistance, inability to stabilize high-speed rotating drive, and increased deviation of bearing life, etc., to achieve reduction The effect of threshing

Active Publication Date: 2015-07-08
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal materials such as bearing steel have insufficient wear resistance, so there is a problem that the variation in bearing life increases, and high-speed rotational drive with high reliability cannot be stably obtained.

Method used

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  • Silicon nitride sintered body and sliding member using same
  • Silicon nitride sintered body and sliding member using same
  • Silicon nitride sintered body and sliding member using same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0030] The first embodiment relates to a silicon nitride sintered body, which is characterized in that: when XRD analysis is performed on the silicon nitride sintered body, when 29.6±0.3° and 31.0±0.3° corresponding to the hexagonal α-SiAlON crystal The strongest peak intensity detected at ° is set as I 29.6° , I 31.0° , on the other hand will be corresponding to β-Si 3 N 4 The strongest peak intensity detected at 33.6±0.3° and 36.1±0.3° of the crystal is set as I 33.6° , I 36.1° When , each strongest peak intensity satisfies the following relationship:

[0031] (I 29.6° +I 31.0° ) / (I 33.6° +I 36.1° )=0.10~0.30 (1)

[0032] In any cross section of the silicon nitride sintered body, the area ratio of the grain boundary phase per unit area of ​​100 μm×100 μm is 25-40%, and the workability coefficient is 0.100-0.120.

[0033] First, conditions for performing XRD analysis will be described. The measurement surface is an arbitrary surface or an arbitrary cross-section of...

no. 2 approach

[0085] A second embodiment is a sliding member using the silicon nitride sintered body of the first embodiment. Examples of the sliding member include bearing balls, rollers, check balls, wear pads, plungers, rollers, and the like. These sliding members slide with counterpart members made of metal members, ceramics, and the like. In order to improve the durability of the sliding surface, it is preferable to design a polished surface having a surface roughness (Ra) of 0.5 μm or less, further 0.1 μm or less, more preferably 0.05 μm or less. By making the sliding surface flat, the durability of the silicon nitride sintered body can be improved, and the aggressiveness to the counterpart member can be reduced. By reducing the aggressiveness to the counterpart member, since the consumption of the counterpart member can be reduced, the durability of the device incorporating the slide member can be improved.

[0086] Examples of devices incorporating sliding members include products...

Embodiment 1～13 and comparative example 1～2

[0105]As silicon nitride powder, α-Si 3 N 4 The ratio is 99% by mass of powder. Next, sintering aids shown in Table 1 were prepared as sintering aids. In addition, as the sintering aid powder, the average particle diameter of 1.3 micrometers or less was used.

[0106] Table 1

[0107]

[0108] Next, the aforementioned silicon nitride powder and sintering aid powder were blended and wet-mixed by a ball mill for 50 hours. Mixing is performed so that the TI value at this time is 1.0 to 2.0. Next, after being taken out from the solution, dried, mixed with a binder, and subjected to a mixing process with a ball mill for 20 hours, mixed raw material powders were prepared respectively.

[0109] Next, each raw material mixture was molded by a molding machine, and then degreased at 460°C. Next, the degreased body is sintered in a nitrogen atmosphere at 1700-1800°C for 4-6 hours.

[0110] Next, HIP treatment is performed on the obtained sintered body. The HIP treatment is car...

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Abstract

This silicon nitride sintered body is characterized in that, during XRD analysis, when the strongest peak intensities detected at 29.6±0.3° and 31.0±0.3° corresponding to a hexogonal α-SiAlON crystal are I29.6° and I31.0° and the strongest peak intensities detected at 33.6±0.3° and 36.1±0.3° corresponding to a β-Si3N4 crystal are I33.6° and I36.1°, these strongest peak intensities fulfill the relation (I29.6° + I31.0°) / (I33.6° + I36.1°) = 0.10 to 0.30 ... (1), the area ratio of the grain boundary phase per 100μm×100μm unit area in an arbitrary cross section of the silicon nitride sintered body is 25-40%, and the machinable coefficient is 0.100-0.120. By means of the present invention, it is possible to provide a silicon nitride sintered body optimal for sliding members having sliding characteristics that remain stable for a long time, and to provide a sliding member using the same.

Description

technical field [0001] Embodiments of the present invention relate to a silicon nitride sintered body and a sliding member using the silicon nitride sintered body. Background technique [0002] Silicon nitride sintered bodies are widely used as structural materials for sliding components such as bearing balls and rollers. For example, metal materials such as bearing steel have conventionally been used as structural materials for bearing members supporting a rotating shaft, especially bearing balls. However, since metal materials such as bearing steel do not have sufficient wear resistance, there is a problem that variation in bearing life increases, and high-speed rotational drive with high reliability cannot be stably obtained. [0003] As a means of solving the above-mentioned problems, in recent years, a silicon nitride sintered body has been used as a structural material of bearing balls. Silicon nitride sintered body is also excellent in sliding properties in ceramics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/599F16C33/32
CPCC04B35/597C04B2235/3826C04B2235/3232C04B2235/3244C04B2235/3225C04B2235/5445C04B2235/3878C04B2235/3258C04B2235/3895F16C33/32C04B2235/80C04B2235/3839C04B2235/3239C04B2235/5436F16C2240/54C04B2235/3256C04B2235/963C04B2235/3847C04B2235/85C04B2235/96C04B2235/3217C04B2235/3865
Inventor 青木克之小松通泰船木开山口晴彦
Owner KK TOSHIBA
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