JPS59102863A - Ceramic sintering body composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The non-explosion 1y'J relates to ceramic sintered bodies used in various articles requiring high hardness and 1R wear resistance, such as cutting height chips and bearings.

Conventionally, A1□0. Or the A1□03 sintered body containing a trace amount of grain growth inhibitor such as Mg 0 has illumination hardness and wear resistance.
<It is widely used as a variety of wear-resistant porcelain, especially as a cutting hide tip for high-speed cutting and ht'M finishing, but its use is limited to light cutting only due to its poor toughness. In order to eliminate these drawbacks, high-toughness ceramics added with Tj C were developed, and the cutting range of ceramic tools was expanded. However, it has not yet been used as a general-purpose material, and is not suitable for heavy cutting that involves mechanical vibration and impact.
It is only used in a limited area.

The purpose of the present invention is to strengthen TiC in this Al2O3TiC ceramic sintered body, and to strengthen TiC on a weight basis.
Nb, V as the first additive in 3-40%.

One or more metals or oxides of Ta, Zr and Hf 1
~10%, CaO, MgO as second additive.

Y 203 IS iO+ N iO+ DV 20
3 and one or more oxides of rare earth elements 0.05 to 3
．． 0% balance A 120. The present invention provides a ceramic sintered body composition characterized by comprising:

The reason for adding one or more metals or oxides among Nb, V, Zr, Ta, and Hf as the first additive is that TiC
This is because a fine and uniformly dispersed structure can be obtained, and as a result, hardness is increased and wear resistance is also improved, thereby improving performance as a tool. In this case Nb, V, Z
r, Ta and Hf are not only added as metals, but may also be added in the form of metal oxides or organic compounds; in short, during sintering,
Similar effects can be obtained if the above-mentioned substances change into metals or oxides. In this case, part or most of the metal is converted into an oxide. This effect is insufficient if it is less than 1%, and if it exceeds 10%, the toughness becomes poor.

Also, as a second additive Ca + M g + Y,'
The reason why one or more of S i + Z r +Ni, Dy, and an oxide of a rare earth element is added is that these suppress the growth of alumina crystal particles and promote sintering at the same time. If the content is less than 0.05%, the effect is poor, and if it exceeds 3.0%, the wear resistance and toughness at high temperature or room temperature decrease.

Next, regarding its production method, well-known production methods for ceramic compositions can be used, but the firing atmosphere must be particularly non-oxidizing.In an atmosphere containing a lot of oxygen, TiC will oxidize and does not exhibit its characteristics.

The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to the scope of the Examples.

Example 1 α-A1209 with 70% particle size of 1 μm or less. Average particle size 1
．． 2. TiC with a total carbon content of 19.4% and additives passed through a 325 mesh were mixed in the proportions shown in Table 1, wet milled with acetone for about 30 hours in a stainless steel ball mill, and the acetone was dried. Volatilize with a machine and 6 in a mortar.
Finely grind the base powder (
A) (hereinafter abbreviated as (A)) is prepared. After adding 5% paraffin to (A) and passing the entire amount through a 60-mesh sieve, it was sieved at a pressure of 1 t/Cm'L to 16X16X7.
Pressure mold into a 5 mm rectangular parallelepiped. Obtained molded body (B)
(hereinafter referred to as (B)) was sintered for 1 hour at the sintering temperature shown in Table 2 under a reduced pressure argon atmosphere (hereinafter referred to as "normal sintering").
). The obtained sintered body was polished with a diamond grindstone to a dimension of 5NGN432TN and a surface of 3S or less, and its properties were measured. The results are shown in Table 2.

Example 2 (A) prepared in the same manner as in Example 1 was subjected to pressure sintering at the sintering temperature shown in Table 2, under the conditions of a pressure of 200 kg/crA and a pressure firing time of 15 minutes. 13 x 13 x 6 mm square plates are sintered in a graphite mold by the method. It was subjected to VR polishing in the same manner as in Example 1, and its properties were measured. The results are shown in Table 2.

Example 3 A primary sintered body was prepared from (B), which was molded in the same manner as in Example 1, under a reduced pressure argon atmosphere at the primary sintering temperature shown in Table 2 for 1 hour. Freezing temperature, pressure 150
Sintering is performed by isostatic pressure sintering under the conditions of 0 kg/CIIT and a holding time of 1 hour. It was subjected to VR polishing in the same manner as in Example 1, and its properties were measured. The results are shown in Table 2.

As shown in Table 2, the ceramic sintered body of the present invention has Al2
Compared to O3 alone, A Iz 03-T i C system, or a ceramic sintered body that does not meet the blending amount of each composition specified in the present invention, the hardness and cutting performance are significantly improved, and the material is less susceptible to mechanical vibration and impact. It was confirmed that heavy cutting is possible.

The ceramic sintered body obtained by the composition of the present invention is a casting,
It can be used as a cutting tool for high hardness materials, metals other than high-density and Nokel alloys, such as aluminum, steel, etc., and non-metals.
Furthermore, it can be used for mechanical parts that are subject to intense vibration or high heat.

Claims (1)

[Claims] Based on city fa standards, N is added as the first additive to TiCl3-40%.
b, 1 to 10% of one or more metals or oxides among V, Ta, Zr, and Hf, CaO as a second additive
, Mu4go, Yz03, SI Oz, Zr
Oz lNi O, Dy2O3, and one or more oxides of rare earth elements 0.05-3.0% balance A1□o3
A ceramic sintered body composition with excellent wear resistance and toughness.