JPS58157927A - Manufacture of composite material - Google Patents

Abstract

PURPOSE:To manufacture a composite material having superior uniformity and workable easily into a thin plate by melting a metal or alloy, dispersing solid powder having higher neutron absorbing power and a higher m.p. than said metal or alloy in the molten metal or alloy, and solidifying the molten metal or alloy by rapid cooling. CONSTITUTION:A matrix phase metal or alloy having high neutron absorbing power and high B concn. is melted, and solid powder having higher neutron absorbing power and a higher m.p. than said metal or alloy, e.g. BN powder is dispersed in the molten metal or alloy. The molten metal or alloy is then spouted on a roll rotating at a high speed through a nozzle by means of a highly compressed gas, and it is solidified by rapid cooling in the form of a thin plate. The resulting composite material is especially suitable for use as a thin neutron absorber having high neutron absorbing power.

Description

DETAILED DESCRIPTION OF THE INVENTION This article is directed to a method for producing composite materials, and more particularly to a method suitable for producing a ribbon-shaped neutron absorbing material with high neutron absorption capacity.

In recent years, excellent neutron absorbing materials have been developed for use as radioactive shielding materials in used nuclear fuel rod storage racks. The properties claimed for this material are firstly that it has a high neutron absorption of -69, and secondly that it is corrosion resistant since the rack is immersed in water. It is said to be strong as Zara-san.

Conventional O storage racks are made of austenitic stainless steel 81
0 partition p is used, but its neutron 1lIIiL
Sushi is &! az”/1001 degrees, which is completely insufficient for p1 ability, - 41r1, a combination of 10,000, B, C, and Mut.
77 mms" / 10 G II, which has a high %A total return, but the material is brittle and the processing is 1JIIIA"
There is e (rice 11' looks Birkins, 12-ru <ts
Attempts have been made to increase neutron collection by adding stainless steel KB;
Bmm (hereinafter referred to as at%) or more (neutron absorption rudder @6
B.
Some attempts have been made to powder stainless steel containing e and sinter it, but due to workability problems, it has been reduced to 1fA, 4at%
The amount of B is the limit (% open @ 54 9 @ 96) Be
The stainless steel part that does not contain B has an effective effect on workability, and the total amount of B can be reduced to t-34t% (
However, the major problem is that the structure of this material is divided into parts that contain Be and parts that do not, and that the p1 neutron absorption capacity is non-uniform. Problems also arise when 6S batteries are formed and corrosion resistance is reduced.

In addition to the lack of uniformity in the composite materials manufactured by the thin casting method, there are also some types of composite materials that are difficult to make into thin plates.

As a sintering method for composite materials other than the powder sintering method, there is a method in which a solid powder is mixed and dispersed in a molten metal and then cooled, but it is difficult to make a thin plate. Further, there is also the problem that particles tend to separate by sedimentation or flotation in a cooling filter, or that segregation tends to occur in solidified metal.

The purpose of the Ij110 of this invention is to solve the above-mentioned conventional problems, to achieve excellent uniformity of the manufactured material, and to easily manufacture thin Ii.
K provides a method for manufacturing composite materials.

In order to achieve this objective, the present invention #i is designed to rapidly cool and solidify a solid powder dispersed in a molten metal alloy.

8110 is a method for rapid cooling aI garden. jj method can be adopted, one of which is a method in which the rotating body is brought into contact with 1 m of #I hot water. This method involves cooling and solidifying the molten metal by contacting it with the outside or inside of a rotating F1 plate or cylinder, and the cooling rate is extremely fast at approximately 10" to 10/8. This method is generally similar to the molten metal rapid cooling method. The resulting alloy can contain a large amount of the element t in solid solution, which is higher than the solid solubility limit in alloys produced by conventional methods, and can also be made into an amorphous phase that has both toughness and strong f. It is possible.

In one embodiment of the present invention, a material with high neutron absorption (for example, one with a high temperature of 811 degrees) is used as the matrix metal, and the powder to be dispersed with IIIK is 11144% l-h of the matrix metal with neutron absorption ability. It is possible to manufacture a composite material for neutron absorption using a substance1. According to this method, there is no segregation in the matrix, the dispersibility of the solid particles is high, and the material is extremely uniform as a whole. Moreover, a composite material with significantly high neutron absorption capacity can be obtained. In addition, it is possible to make the parent phase amorphous as described above by rapidly solidifying the alloy.
Since there are many eutectic compositions such as t#20at%, the melting point is low and the wettability of #1111 is strong, so
It is easy to mix powders such as compound B in a garden-like structure], and even in the IIk structure after coagulation, the interface between the dispersed particles and the matrix is very Vcv! ! It is. It has the advantage that its rounding and tensile strength are increased by the composite reinforcement of the dispersed particles. First, when the parent phase is an amorphous phase, it shows high corrosion resistance in terms of corrosion resistance. In other words, according to the present invention, while taking advantage of the conventional amorphous association, the total amount of amorphous It is possible to create a composite material containing Bft of more than a quality alloy.

Examples of the present invention will be explained below in Table I11 and Section 1-1. The composite quenched alloy shown in Example 1 was prepared using a generally known rapid roll quenching apparatus. In other words, it is a method in which the molten metal is rapidly cooled into a thin plate by being spouted with high-pressure gas through a nozzle on a roll.
In this example, a steel roll with a diameter of 200sll was heated to 3100O
Rapid cooling was performed under conditions of rotation at rpm, and a processed quartz tube was used as the nozzle. Samples were prepared in advance: one that had been ground after the alloy tSS had a matrix composition, and the other that had been combined with a high-melting point alloy tSS that had a neutron absorption capacity of 300 mesh or less. B, C, and BNt were used as powder materials with a high neutron absorption capacity and a melting point of 11%. These were inserted into a nozzle and heated and melted by high frequency trout conduction heating. A stirrer and construction rod (A401) are installed inside the nozzle, and after the sample is dissolved, it is stirred and the high pressure A is applied as quickly as possible.
P was ejected due to r gas.

ll4illl1 The final substance was mixed into the hot water using high-frequency agitation and a stirring rod, so that it was uniformly dispersed in the rapidly solidified alloy. Thermal neutron absorption capacity, tensile strength, and corrosion of these alloys The parent phase of these O-quenched composite alloys shown in Table 1111 was an amorphous phase. Corrosion test is 80C
Sample # immersed in pure water for 2400 hours! I went to the mountain by the method of t-pel. Note that the amount of powder added is % by weight relative to the parent phase. Alloys 1 and 7 are in an amorphous phase with no added powder material and have a neutron 111Mit, *
l! It is an alloy with excellent warping and corrosion resistance. The neutron absorption capacity of the alloys KB, C or JI 62-6 and 18-9 composited with BNt increases with the amount of B4C or BNO added, and the tensile strength tends to increase to 4.41. For example, the Todoroki 5 alloy showed extremely superior neutron absorption ability, nearly 10 times that of conventional materials and more than twice that of the non-composite matrix alloy.

The ts1 diagram shows Ni, ・C' depending on the amount of composite material B4C added.
v,a shows the change in tensile strength of Pt@Ba alloy. As you can see from Jllll, it is a composite alloy pull!
1N strength increases as the amount of copper added to the powder material O increases, and the combined effect decreases! It can be seen that it is also effective in the case of jlIilIK. However, if the addition amount is increased too much, M clusters of the composite material will be observed, the dispersed particles will become coarse, and the uniformity of the dispersion will also decrease. Since this also reduces the tensile strength, the amount of the composite material added is preferably 25% or less.

According to the present invention, it is possible to manufacture a composite material with high uniformity. In addition, the thin film 41 can be manufactured easily, and the matrix metal can also be made amorphous. Furthermore, the matrix metal O composite fiber is 1m long, and it is high! It can also be ffIII&.

easy drawing a#4

Claims (1)

[Claims] 1. Dispersing the homogeneous powder in 0 drops of metal or alloy hot water.
rt-bale, quenching S hardening 1-* A method for producing a composite material. 2. The method described in Section 8, Section 1 of Patent III, wherein Alloy +18 is a molten alloy having a neutron capacity of 1 lik. 3. The method according to the assga claim, in which the solid powder and the alloy 19 also have a high neutron absorption capacity and are even higher in neutron absorption capacity. 4. Alloy #I hot water contains H9 volume. 5. The method according to claim S4a, in which the solid powder is made of bulky metal. 6. The metal or alloy in the composite material is amorphous. 7. The composite material is in the form of a thin plate.Patent Ifl11 Request 0 @ Garden No. 1
Any one of Section 6 to Section 6 IaK method.