CN109133941A - 一种氮化硅陶瓷轴承材料 - Google Patents

一种氮化硅陶瓷轴承材料 Download PDF

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CN109133941A
CN109133941A CN201710498882.2A CN201710498882A CN109133941A CN 109133941 A CN109133941 A CN 109133941A CN 201710498882 A CN201710498882 A CN 201710498882A CN 109133941 A CN109133941 A CN 109133941A
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silicon nitride
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slurry
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朱世勇
易巧英
陈尧
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Nanjing Haiyin Communication Equipment Co Ltd
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Abstract

本发明公开了一种氮化硅陶瓷轴承材料，采用25～45wt％的α‑sialon相、10～15wt％的β‑Si3N4相为原料，加入纯度99.99％，平均粒度1μm的Al2O3 5wt％；纯度99.99％，平均粒度0.8μm的Y2O3 5wt％；纯度99.99％，平均粒度0.8μm的Sm2O3 1.5wt％和纯度99.99％，平均粒度0.8μm的Ce2O3 3wt％，以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；将料浆进行真空干燥并混合配好的胶得到造粒粉，该胶由粘结剂和无水乙醇组成；将造粒粉倒入轴承模具进行模压成型。

Description

一种氮化硅陶瓷轴承材料
技术领域
本发明涉及氮化硅陶瓷材料及其制备方法，具体涉及一种氮化硅陶瓷轴承材料。
背景技术
氮化硅陶瓷由于其良好的力学性能和优异的自润滑性被作为密封件使用。目前，国内氮化硅材料主要由反应烧结、热压和热等静压烧结工艺制备。反应烧结制得的制品含有较多气孔，相对密度不到85％，且力学性能低下、强度较低，仅为150～350MPa。而热压、热等静压烧结不仅需要昂贵的烧结设备及辅助耗材(如包套等)，而且烧结成本高(高温高压所需的水、电、气等)，导致产品制造成本高，严重遏制了氮化硅材料在密封环市场上的应用。
并且，氮化硅材料自扩散系数低，本身烧结困难，且在高温下极其容易分解，往往需要高高压才能烧结致密。
同时现有技术中的氮化硅陶瓷球存在着强度低、室内断裂韧性差的问题，因此，有必要研发出一种符合市场需求的氮化硅陶瓷。
发明内容
本发明的目的在于解决有技术中的氮化硅陶瓷球存在着自扩散系数低、本身烧结困难、强度低、室内断裂韧性差的问题，提供一种氮化硅陶瓷轴承材料。
本发明解决其技术问题是通过以下技术方案实现的：
一种氮化硅陶瓷轴承材料，采用25～45wt％的α-sialon相、10～15wt％的β-Si3N4相为原料，加入纯度99.99％，平均粒度1μm的Al2O3 5wt％；纯度99.99％，平均粒度0.8μm的Y2O3 5wt％；纯度99.99％，平均粒度0.8μm的Sm2O3 1.5wt％和纯度99.99％，平均粒度0.8μm的Ce2O3 3wt％，以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；将料浆进行真空干燥并混合配好的胶得到造粒粉，该胶由粘结剂和无水乙醇组成；将造粒粉倒入轴承模具进行模压成型。
一种氮化硅陶瓷轴承材料的制备方法，包括以下步骤：
(1)按以下方案进行配比：25～45wt％的α-sialon相、10～15wt％的β-Si3N4相为原料，加入纯度99.99％，平均粒度1μm的Al2O3 5wt％；纯度99.99％，平均粒度0.8μm的Y2O35wt％；纯度99.99％，平均粒度0.8μm的Sm2O3 1.5wt％和纯度99.99％，平均粒度0.8μm的Ce2O3 3wt％；
(2)将原料以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；
(3)对料浆进行真空干燥，然后过80目筛，得到干燥粉；
(4)将预先配好的胶加入至过筛后的干燥粉中混合，然后均匀过40目筛，得到造粒粉；所述的胶由粘结剂和无水乙醇组成，其中，粘结剂含量为干燥粉重量的1～3％，无水乙醇含量为干燥粉重量的15～25％；
(5)将造粒粉倒入轴承模具，然后于100～170MPa的压力下模压成型，制得氮化硅环坯体；
(6)将氮化硅环坯体用真空注塑机注塑成Φ10mm的球体后放入排胶炉中运用600℃排胶；
(7)将排胶后的氮化硅陶瓷轴承在氮气或氩气压力为2MPa下1800℃保温2小时烧结。
进一步的，所述步骤(4)中的粘结剂为聚乙二醇、聚乙烯醇羧丁醛中任意一种或两种。
本发明的有益效果为：
与现有技术相比，本发明进一步优化了氮化硅陶瓷材料中各种成分的配比，从而改善了氮化硅陶瓷材料的致密度、强度、断裂韧性和硬度等性能指标。同时，本发明优化了氮化硅陶瓷材料的制备方法，通过添加助烧剂(氧化镁、氧化铝及稀土氧化物)对氮化硅烧结的助烧作用，有效降低了氮化硅致密化的烧结温度，同时通过埋粉工艺调节烧结的气氛，有效抑制氮化硅在高温下的分解，使得整个氮化硅材料在常压炉下即可完成致密化烧结。
具体实施方式
下面通过具体实施例对本发明作进一步详述，以下实施例只是描述性的，不是限定性的，不能以此限定本发明的保护范围。
实施例1
一种氮化硅陶瓷轴承材料，采用25wt％的α-sialon相、10wt％的β-Si3N4相为原料，加入纯度99.99％，平均粒度1μm的Al2O3 5wt％；纯度99.99％，平均粒度0.8μm的Y2O35wt％；纯度99.99％，平均粒度0.8μm的Sm2O3 1.5wt％和纯度99.99％，平均粒度0.8μm的Ce2O3 3wt％，以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；将料浆进行真空干燥并混合配好的胶得到造粒粉，该胶由粘结剂和无水乙醇组成；将造粒粉倒入轴承模具进行模压成型。
一种氮化硅陶瓷轴承材料的制备方法，包括以下步骤：
(1)将原料以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；
(2)对料浆进行真空干燥，然后过80目筛，得到干燥粉；
(3)将预先配好的胶加入至过筛后的干燥粉中混合，然后均匀过40目筛，得到造粒粉；该胶由粘结剂和无水乙醇组成，其中，粘结剂为聚乙二醇，粘结剂含量为干燥粉重量的1％，无水乙醇含量为干燥粉重量的15％；
(4)将造粒粉倒入轴承模具，然后于100MPa的压力下模压成型，制得氮化硅环坯体；
(5)将氮化硅环坯体用真空注塑机注塑成Φ10mm的球体后放入排胶炉中运用600℃排胶；
(6)将排胶后的氮化硅陶瓷轴承在氮气或氩气压力为2MPa下1800℃保温2小时烧结。
本实施例的氮化硅陶瓷轴承材料断裂韧性为0.9MPa·m1/2，抗弯强度1697N/mm2。
实施例2
一种氮化硅陶瓷轴承材料，采用35wt％的α-sialon相、12.5wt％的β-Si3N4相为原料，加入纯度99.99％，平均粒度1μm的Al2O3 5wt％；纯度99.99％，平均粒度0.8μm的Y2O35wt％；纯度99.99％，平均粒度0.8μm的Sm2O3 1.5wt％和纯度99.99％，平均粒度0.8μm的Ce2O3 3wt％，以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；将料浆进行真空干燥并混合配好的胶得到造粒粉，该胶由粘结剂和无水乙醇组成；将造粒粉倒入轴承模具进行模压成型。
一种氮化硅陶瓷轴承材料的制备方法，包括以下步骤：
(1)将原料以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；
(2)对料浆进行真空干燥，然后过80目筛，得到干燥粉；
(3)将预先配好的胶加入至过筛后的干燥粉中混合，然后均匀过40目筛，得到造粒粉；该胶由粘结剂和无水乙醇组成，其中，粘结剂为聚乙二醇，粘结剂含量为干燥粉重量的1％，无水乙醇含量为干燥粉重量的15％；
(4)将造粒粉倒入轴承模具，然后于100MPa的压力下模压成型，制得氮化硅环坯体；
(5)将氮化硅环坯体用真空注塑机注塑成Φ10mm的球体后放入排胶炉中运用600℃排胶；
(6)将排胶后的氮化硅陶瓷轴承在氮气或氩气压力为2MPa下1800℃保温2小时烧结。
本实施例的氮化硅陶瓷轴承材料断裂韧性为1.5MPa·m1/2，抗弯强度1296N/mm2。
实施例3
一种氮化硅陶瓷轴承材料，采用45wt％的α-sialon相、15wt％的β-Si3N4相为原料，加入纯度99.99％，平均粒度1μm的Al2O3 5wt％；纯度99.99％，平均粒度0.8μm的Y2O35wt％；纯度99.99％，平均粒度0.8μm的Sm2O3 1.5wt％和纯度99.99％，平均粒度0.8μm的Ce2O3 3wt％，以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；将料浆进行真空干燥并混合配好的胶得到造粒粉，该胶由粘结剂和无水乙醇组成；将造粒粉倒入轴承模具进行模压成型。
一种氮化硅陶瓷轴承材料的制备方法，包括以下步骤：
(1)将原料以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；
(2)对料浆进行真空干燥，然后过80目筛，得到干燥粉；
(3)将预先配好的胶加入至过筛后的干燥粉中混合，然后均匀过40目筛，得到造粒粉；该胶由粘结剂和无水乙醇组成，其中，粘结剂为聚乙二醇，粘结剂含量为干燥粉重量的1％，无水乙醇含量为干燥粉重量的15％；
(4)将造粒粉倒入轴承模具，然后于100MPa的压力下模压成型，制得氮化硅环坯体；
(5)将氮化硅环坯体用真空注塑机注塑成Φ10mm的球体后放入排胶炉中运用600℃排胶；
(6)将排胶后的氮化硅陶瓷轴承在氮气或氩气压力为2MPa下1800℃保温2小时烧结。
本实施例的氮化硅陶瓷轴承材料断裂韧性为1.8MPa·m1/2，抗弯强度1038N/mm2。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (3)

1.一种氮化硅陶瓷轴承材料，其特征在于：采用25～45wt％的α-sialon相、10～15wt％的β-Si3N4相为原料，加入纯度99.99％，平均粒度1μm的Al2O3 5wt％；纯度99.99％，平均粒度0.8μm的Y2O3 5wt％；纯度99.99％，平均粒度0.8μm的Sm2O3 1.5wt％和纯度99.99％，平均粒度0.8μm的Ce2O3 3wt％，以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；将料浆进行真空干燥并混合配好的胶得到造粒粉，该胶由粘结剂和无水乙醇组成；将造粒粉倒入轴承模具进行模压成型。
2.一种基于权利要求1所述的一种氮化硅陶瓷轴承材料的制备方法，其特征在于：包括以下步骤：
(1)按以下方案进行配比：25～45wt％的α-sialon相、10～15wt％的β-Si3N4相为原料，加入纯度99.99％，平均粒度1μm的Al2O3 5wt％；纯度99.99％，平均粒度0.8μm的Y2O35wt％；纯度99.99％，平均粒度0.8μm的Sm2O3 1.5wt％和纯度99.99％，平均粒度0.8μm的Ce2O3 3wt％；
(2)将原料以氮化硅研磨球为磨介，以汽油为混合介质在卧式球磨机中搅拌40小时形成料浆，料浆中的固相重量为料浆重量的40％；
(3)对料浆进行真空干燥，然后过80目筛，得到干燥粉；
(4)将预先配好的胶加入至过筛后的干燥粉中混合，然后均匀过40目筛，得到造粒粉；所述的胶由粘结剂和无水乙醇组成，其中，粘结剂含量为干燥粉重量的1～3％，无水乙醇含量为干燥粉重量的15～25％；
(5)将造粒粉倒入轴承模具，然后于100～170MPa的压力下模压成型，制得氮化硅环坯体；
(6)将氮化硅环坯体用真空注塑机注塑成Φ10mm的球体后放入排胶炉中运用600℃排胶；
(7)将排胶后的氮化硅陶瓷轴承在氮气或氩气压力为2MPa下1800℃保温2小时烧结。
3.如权利要求2所述的一种氮化硅陶瓷轴承材料的制备方法，其特征在于：所述步骤(4)中的粘结剂为聚乙二醇、聚乙烯醇羧丁醛中任意一种或两种。
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RU2757607C1 (ru) * 2021-04-12 2021-10-19 Федеральное государственное бюджетное учреждение науки Институт металлургии и материаловедения им. А.А. Байкова Российской академии наук (ИМЕТ РАН) Способ получения 21R-сиалоновой керамики

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2757607C1 (ru) * 2021-04-12 2021-10-19 Федеральное государственное бюджетное учреждение науки Институт металлургии и материаловедения им. А.А. Байкова Российской академии наук (ИМЕТ РАН) Способ получения 21R-сиалоновой керамики

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